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diff --git a/gcc/f/NEWS b/gcc/f/NEWS deleted file mode 100755 index 1bbefc2..0000000 --- a/gcc/f/NEWS +++ /dev/null @@ -1,1603 +0,0 @@ -This file lists recent changes to the GNU Fortran compiler. Copyright -(C) 1995, 96, 97, 1998 Free Software Foundation, Inc. You may copy, -distribute, and modify it freely as long as you preserve this copyright -notice and permission notice. - -News About GNU Fortran -********************** - - Changes made to recent versions of GNU Fortran are listed below, -with the most recent version first. - - The changes are generally listed in order: - - 1. Code-generation and run-time-library bug-fixes - - 2. Compiler and run-time-library crashes involving valid code that - have been fixed - - 3. New features - - 4. Fixes and enhancements to existing features - - 5. New diagnostics - - 6. Internal improvements - - 7. Miscellany - - This order is not strict--for example, some items involve a -combination of these elements. - - Note that two variants of `g77' are tracked below. The `egcs' -variant is described vis-a-vis previous versions of `egcs' and/or an -official FSF version, as appropriate. - - Therefore, `egcs' versions sometimes have multiple listings to help -clarify how they differ from other versions, though this can make -getting a complete picture of what a particular `egcs' version contains -somewhat more difficult. - -In 0.5.24 and `egcs' 1.1.1 (versus 0.5.23 and 1.1): -=================================================== - - * Fix `libg2c' so it performs an implicit `ENDFILE' operation (as - appropriate) whenever a `REWIND' is done. - - (This bug was introduced in 0.5.23 and `egcs' 1.1 in `g77''s - version of `libf2c'.) - - * Fix `libg2c' so it no longer crashes with a spurious diagnostic - upon doing any I/O following a direct formatted write. - - (This bug was introduced in 0.5.23 and `egcs' 1.1 in `g77''s - version of `libf2c'.) - - * Fix `g77' so it no longer crashes compiling references to the - `Rand' intrinsic on some systems. - - * Fix `g77' portion of installation process so it works better on - some systems (those with shells requiring `else true' clauses on - `if' constructs for the completion code to be set properly). - -In `egcs' 1.1 (versus 0.5.24): -============================== - - * Fix `g77' crash compiling code containing the construct - `CMPLX(0.)' or similar. - - * Fix `g77' crash (or apparently infinite run-time) when compiling - certain complicated expressions involving `COMPLEX' arithmetic - (especially multiplication). - - * Fix a code-generation bug that afflicted Intel x86 targets when - `-O2' was specified compiling, for example, an old version of the - `DNRM2' routine. - - The x87 coprocessor stack was being mismanaged in cases involving - assigned `GOTO' and `ASSIGN'. - - * Align static double-precision variables and arrays on Intel x86 - targets regardless of whether `-malign-double' is specified. - - Generally, this affects only local variables and arrays having the - `SAVE' attribute or given initial values via `DATA'. - -In `egcs' 1.1 (versus `egcs' 1.0.3): -==================================== - - * Fix bugs in the `libU77' intrinsic `HostNm' that wrote one byte - beyond the end of its `CHARACTER' argument, and in the `libU77' - intrinsics `GMTime' and `LTime' that overwrote their arguments. - - * Assumed arrays with negative bounds (such as `REAL A(-1:*)') no - longer elicit spurious diagnostics from `g77', even on systems - with pointers having different sizes than integers. - - This bug is not known to have existed in any recent version of - `gcc'. It was introduced in an early release of `egcs'. - - * Valid combinations of `EXTERNAL', passing that external as a dummy - argument without explicitly giving it a type, and, in a subsequent - program unit, referencing that external as an external function - with a different type no longer crash `g77'. - - * `CASE DEFAULT' no longer crashes `g77'. - - * The `-Wunused' option no longer issues a spurious warning about - the "master" procedure generated by `g77' for procedures - containing `ENTRY' statements. - - * Support `FORMAT(I<EXPR>)' when EXPR is a compile-time constant - `INTEGER' expression. - - * Fix `g77' `-g' option so procedures that use `ENTRY' can be - stepped through, line by line, in `gdb'. - - * Allow any `REAL' argument to intrinsics `Second' and `CPU_Time'. - - * Use `tempnam', if available, to open scratch files (as in - `OPEN(STATUS='SCRATCH')') so that the `TMPDIR' environment - variable, if present, is used. - - * `g77''s version of `libf2c' separates out the setting of global - state (such as command-line arguments and signal handling) from - `main.o' into distinct, new library archive members. - - This should make it easier to write portable applications that - have their own (non-Fortran) `main()' routine properly set up the - `libf2c' environment, even when `libf2c' (now `libg2c') is a - shared library. - - * `g77' no longer installs the `f77' command and `f77.1' man page in - the `/usr' or `/usr/local' heirarchy, even if the `f77-install-ok' - file exists in the source or build directory. See the - installation documentation for more information. - - * `g77' no longer installs the `libf2c.a' library and `f2c.h' - include file in the `/usr' or `/usr/local' heirarchy, even if the - `f2c-install-ok' or `f2c-exists-ok' files exist in the source or - build directory. See the installation documentation for more - information. - - * The `libf2c.a' library produced by `g77' has been renamed to - `libg2c.a'. It is installed only in the `gcc' "private" directory - heirarchy, `gcc-lib'. This allows system administrators and users - to choose which version of the `libf2c' library from `netlib' they - wish to use on a case-by-case basis. See the installation - documentation for more information. - - * The `f2c.h' include (header) file produced by `g77' has been - renamed to `g2c.h'. It is installed only in the `gcc' "private" - directory heirarchy, `gcc-lib'. This allows system administrators - and users to choose which version of the include file from - `netlib' they wish to use on a case-by-case basis. See the - installation documentation for more information. - - * The `g77' command now expects the run-time library to be named - `libg2c.a' instead of `libf2c.a', to ensure that a version other - than the one built and installed as part of the same `g77' version - is picked up. - - * During the configuration and build process, `g77' creates - subdirectories it needs only as it needs them. Other cleaning up - of the configuration and build process has been performed as well. - - * `install-info' now used to update the directory of Info - documentation to contain an entry for `g77' (during installation). - - * Some diagnostics have been changed from warnings to errors, to - prevent inadvertent use of the resulting, probably buggy, programs. - These mostly include diagnostics about use of unsupported features - in the `OPEN', `INQUIRE', `READ', and `WRITE' statements, and - about truncations of various sorts of constants. - - * Improve compilation of `FORMAT' expressions so that a null byte is - appended to the last operand if it is a constant. This provides a - cleaner run-time diagnostic as provided by `libf2c' for statements - like `PRINT '(I1', 42'. - - * Improve documentation and indexing. - - * The upgrade to `libf2c' as of 1998-06-18 should fix a variety of - problems, including those involving some uses of the `T' format - specifier, and perhaps some build (porting) problems as well. - -In 0.5.24 and `egcs' 1.1 (versus 0.5.23): -========================================= - - * `g77' no longer produces incorrect code and initial values for - `EQUIVALENCE' and `COMMON' aggregates that, due to "unnatural" - ordering of members vis-a-vis their types, require initial padding. - - * `g77' no longer crashes when compiling code containing - specification statements such as `INTEGER(KIND=7) PTR'. - - * `g77' now treats `%LOC(EXPR)' and `LOC(EXPR)' as "ordinary" - expressions when they are used as arguments in procedure calls. - This change applies only to global (filewide) analysis, making it - consistent with how `g77' actually generates code for these cases. - - Previously, `g77' treated these expressions as denoting special - "pointer" arguments for the purposes of filewide analysis. - - * The `g77' driver now ensures that `-lg2c' is specified in the link - phase prior to any occurrence of `-lm'. This prevents - accidentally linking to a routine in the SunOS4 `-lm' library when - the generated code wants to link to the one in `libf2c' (`libg2c'). - - * `g77' emits more debugging information when `-g' is used. - - This new information allows, for example, `which __g77_length_a' - to be used in `gdb' to determine the type of the phantom length - argument supplied with `CHARACTER' variables. - - This information pertains to internally-generated type, variable, - and other information, not to the longstanding deficiencies - vis-a-vis `COMMON' and `EQUIVALENCE'. - - * The F90 `Date_and_Time' intrinsic now is supported. - - * The F90 `System_Clock' intrinsic allows the optional arguments - (except for the `Count' argument) to be omitted. - - * Upgrade to `libf2c' as of 1998-06-18. - - * Improve documentation and indexing. - -In 0.5.23 (versus 0.5.22): -========================== - - * This release contains several regressions against version 0.5.22 - of `g77', due to using the "vanilla" `gcc' back end instead of - patching it to fix a few bugs and improve performance in a few - cases. - - *Note Actual Bugs We Haven't Fixed Yet: Actual Bugs, available in - plain-text format in `gcc/f/BUGS', for information on the known - bugs in this version, including the regressions. - - Features that have been dropped from this version of `g77' due to - their being implemented via `g77'-specific patches to the `gcc' - back end in previous releases include: - - - Support for `__restrict__' keyword, the options - `-fargument-alias', `-fargument-noalias', and - `-fargument-noalias-global', and the corresponding - alias-analysis code. - - (`egcs' has the alias-analysis code, but not the - `__restrict__' keyword. `egcs' `g77' users benefit from the - alias-analysis code despite the lack of the `__restrict__' - keyword, which is a C-language construct.) - - - Support for the GNU compiler options `-fmove-all-movables', - `-freduce-all-givs', and `-frerun-loop-opt'. - - (`egcs' supports these options. `g77' users of `egcs' - benefit from them even if they are not explicitly specified, - because the defaults are optimized for `g77' users.) - - - Support for the `-W' option warning about integer division by - zero. - - - The Intel x86-specific option `-malign-double' applying to - stack-allocated data as well as statically-allocate data. - - Note that the `gcc/f/gbe/' subdirectory has been removed from this - distribution as a result of `g77' no longer including patches for - the `gcc' back end. - - * Fix bugs in the `libU77' intrinsic `HostNm' that wrote one byte - beyond the end of its `CHARACTER' argument, and in the `libU77' - intrinsics `GMTime' and `LTime' that overwrote their arguments. - - * Support `gcc' version 2.8, and remove support for prior versions - of `gcc'. - - * Remove support for the `--driver' option, as `g77' now does all - the driving, just like `gcc'. - - * `CASE DEFAULT' no longer crashes `g77'. - - * Valid combinations of `EXTERNAL', passing that external as a dummy - argument without explicitly giving it a type, and, in a subsequent - program unit, referencing that external as an external function - with a different type no longer crash `g77'. - - * `g77' no longer installs the `f77' command and `f77.1' man page in - the `/usr' or `/usr/local' heirarchy, even if the `f77-install-ok' - file exists in the source or build directory. See the - installation documentation for more information. - - * `g77' no longer installs the `libf2c.a' library and `f2c.h' - include file in the `/usr' or `/usr/local' heirarchy, even if the - `f2c-install-ok' or `f2c-exists-ok' files exist in the source or - build directory. See the installation documentation for more - information. - - * The `libf2c.a' library produced by `g77' has been renamed to - `libg2c.a'. It is installed only in the `gcc' "private" directory - heirarchy, `gcc-lib'. This allows system administrators and users - to choose which version of the `libf2c' library from `netlib' they - wish to use on a case-by-case basis. See the installation - documentation for more information. - - * The `f2c.h' include (header) file produced by `g77' has been - renamed to `g2c.h'. It is installed only in the `gcc' "private" - directory heirarchy, `gcc-lib'. This allows system administrators - and users to choose which version of the include file from - `netlib' they wish to use on a case-by-case basis. See the - installation documentation for more information. - - * The `g77' command now expects the run-time library to be named - `libg2c.a' instead of `libf2c.a', to ensure that a version other - than the one built and installed as part of the same `g77' version - is picked up. - - * The `-Wunused' option no longer issues a spurious warning about - the "master" procedure generated by `g77' for procedures - containing `ENTRY' statements. - - * `g77''s version of `libf2c' separates out the setting of global - state (such as command-line arguments and signal handling) from - `main.o' into distinct, new library archive members. - - This should make it easier to write portable applications that - have their own (non-Fortran) `main()' routine properly set up the - `libf2c' environment, even when `libf2c' (now `libg2c') is a - shared library. - - * During the configuration and build process, `g77' creates - subdirectories it needs only as it needs them, thus avoiding - unnecessary creation of, for example, `stage1/f/runtime' when - doing a non-bootstrap build. Other cleaning up of the - configuration and build process has been performed as well. - - * `install-info' now used to update the directory of Info - documentation to contain an entry for `g77' (during installation). - - * Some diagnostics have been changed from warnings to errors, to - prevent inadvertent use of the resulting, probably buggy, programs. - These mostly include diagnostics about use of unsupported features - in the `OPEN', `INQUIRE', `READ', and `WRITE' statements, and - about truncations of various sorts of constants. - - * Improve documentation and indexing. - - * Upgrade to `libf2c' as of 1998-04-20. - - This should fix a variety of problems, including those involving - some uses of the `T' format specifier, and perhaps some build - (porting) problems as well. - -In 0.5.22 (versus 0.5.21): -========================== - - * Fix code generation for iterative `DO' loops that have one or more - references to the iteration variable, or to aliases of it, in - their control expressions. For example, `DO 10 J=2,J' now is - compiled correctly. - - * Fix a code-generation bug that afflicted Intel x86 targets when - `-O2' was specified compiling, for example, an old version of the - `DNRM2' routine. - - The x87 coprocessor stack was being mismanaged in cases involving - assigned `GOTO' and `ASSIGN'. - - * Fix `DTime' intrinsic so as not to truncate results to integer - values (on some systems). - - * Fix `Signal' intrinsic so it offers portable support for 64-bit - systems (such as Digital Alphas running GNU/Linux). - - * Fix run-time crash involving `NAMELIST' on 64-bit machines such as - Alphas. - - * Fix `g77' version of `libf2c' so it no longer produces a spurious - `I/O recursion' diagnostic at run time when an I/O operation (such - as `READ *,I') is interrupted in a manner that causes the program - to be terminated via the `f_exit' routine (such as via `C-c'). - - * Fix `g77' crash triggered by `CASE' statement with an omitted - lower or upper bound. - - * Fix `g77' crash compiling references to `CPU_Time' intrinsic. - - * Fix `g77' crash (or apparently infinite run-time) when compiling - certain complicated expressions involving `COMPLEX' arithmetic - (especially multiplication). - - * Fix `g77' crash on statements such as `PRINT *, - (REAL(Z(I)),I=1,2)', where `Z' is `DOUBLE COMPLEX'. - - * Fix a `g++' crash. - - * Support `FORMAT(I<EXPR>)' when EXPR is a compile-time constant - `INTEGER' expression. - - * Fix `g77' `-g' option so procedures that use `ENTRY' can be - stepped through, line by line, in `gdb'. - - * Fix a profiling-related bug in `gcc' back end for Intel x86 - architecture. - - * Allow any `REAL' argument to intrinsics `Second' and `CPU_Time'. - - * Allow any numeric argument to intrinsics `Int2' and `Int8'. - - * Use `tempnam', if available, to open scratch files (as in - `OPEN(STATUS='SCRATCH')') so that the `TMPDIR' environment - variable, if present, is used. - - * Rename the `gcc' keyword `restrict' to `__restrict__', to avoid - rejecting valid, existing, C programs. Support for `restrict' is - now more like support for `complex'. - - * Fix `-fpedantic' to not reject procedure invocations such as - `I=J()' and `CALL FOO()'. - - * Fix `-fugly-comma' to affect invocations of only external - procedures. Restore rejection of gratuitous trailing omitted - arguments to intrinsics, as in `I=MAX(3,4,,)'. - - * Fix compiler so it accepts `-fgnu-intrinsics-*' and - `-fbadu77-intrinsics-*' options. - - * Improve diagnostic messages from `libf2c' so it is more likely - that the printing of the active format string is limited to the - string, with no trailing garbage being printed. - - (Unlike `f2c', `g77' did not append a null byte to its compiled - form of every format string specified via a `FORMAT' statement. - However, `f2c' would exhibit the problem anyway for a statement - like `PRINT '(I)garbage', 1' by printing `(I)garbage' as the - format string.) - - * Improve compilation of `FORMAT' expressions so that a null byte is - appended to the last operand if it is a constant. This provides a - cleaner run-time diagnostic as provided by `libf2c' for statements - like `PRINT '(I1', 42'. - - * Fix various crashes involving code with diagnosed errors. - - * Fix cross-compilation bug when configuring `libf2c'. - - * Improve diagnostics. - - * Improve documentation and indexing. - - * Upgrade to `libf2c' as of 1997-09-23. This fixes a formatted-I/O - bug that afflicted 64-bit systems with 32-bit integers (such as - Digital Alpha running GNU/Linux). - -In `egcs' 1.0.2 (versus `egcs' 1.0.1): -====================================== - - * Fix `g77' crash triggered by `CASE' statement with an omitted - lower or upper bound. - - * Fix `g77' crash on statements such as `PRINT *, - (REAL(Z(I)),I=1,2)', where `Z' is `DOUBLE COMPLEX'. - - * Fix `-fPIC' (such as compiling for ELF targets) on the Intel x86 - architecture target so invalid assembler code is no longer - produced. - - * Fix `-fpedantic' to not reject procedure invocations such as - `I=J()' and `CALL FOO()'. - - * Fix `-fugly-comma' to affect invocations of only external - procedures. Restore rejection of gratuitous trailing omitted - arguments to intrinsics, as in `I=MAX(3,4,,)'. - - * Fix compiler so it accepts `-fgnu-intrinsics-*' and - `-fbadu77-intrinsics-*' options. - -In `egcs' 1.0.1 (versus `egcs' 1.0): -==================================== - - * Fix run-time crash involving `NAMELIST' on 64-bit machines such as - Alphas. - -In `egcs' 1.0 (versus 0.5.21): -============================== - - * Version 1.0 of `egcs' contains several regressions against version - 0.5.21 of `g77', due to using the "vanilla" `gcc' back end instead - of patching it to fix a few bugs and improve performance in a few - cases. - - *Note Actual Bugs We Haven't Fixed Yet: Actual Bugs, available in - plain-text format in `gcc/f/BUGS', for information on the known - bugs in this version, including the regressions. - - Features that have been dropped from this version of `g77' due to - their being implemented via `g77'-specific patches to the `gcc' - back end in previous releases include: - - - Support for the C-language `restrict' keyword. - - - Support for the `-W' option warning about integer division by - zero. - - - The Intel x86-specific option `-malign-double' applying to - stack-allocated data as well as statically-allocate data. - - Note that the `gcc/f/gbe/' subdirectory has been removed from this - distribution as a result of `g77' being fully integrated with the - `egcs' variant of the `gcc' back end. - - * Fix code generation for iterative `DO' loops that have one or more - references to the iteration variable, or to aliases of it, in - their control expressions. For example, `DO 10 J=2,J' now is - compiled correctly. - - * Fix `DTime' intrinsic so as not to truncate results to integer - values (on some systems). - - * Remove support for non-`egcs' versions of `gcc'. - - * Remove support for the `--driver' option, as `g77' now does all - the driving, just like `gcc'. - - * Allow any numeric argument to intrinsics `Int2' and `Int8'. - - * Improve diagnostic messages from `libf2c' so it is more likely - that the printing of the active format string is limited to the - string, with no trailing garbage being printed. - - (Unlike `f2c', `g77' did not append a null byte to its compiled - form of every format string specified via a `FORMAT' statement. - However, `f2c' would exhibit the problem anyway for a statement - like `PRINT '(I)garbage', 1' by printing `(I)garbage' as the - format string.) - - * Upgrade to `libf2c' as of 1997-09-23. This fixes a formatted-I/O - bug that afflicted 64-bit systems with 32-bit integers (such as - Digital Alpha running GNU/Linux). - -In 0.5.21: -========== - - * Fix a code-generation bug introduced by 0.5.20 caused by loop - unrolling (by specifying `-funroll-loops' or similar). This bug - afflicted all code compiled by version 2.7.2.2.f.2 of `gcc' (C, - C++, Fortran, and so on). - - * Fix a code-generation bug manifested when combining local - `EQUIVALENCE' with a `DATA' statement that follows the first - executable statement (or is treated as an executable-context - statement as a result of using the `-fpedantic' option). - - * Fix a compiler crash that occured when an integer division by a - constant zero is detected. Instead, when the `-W' option is - specified, the `gcc' back end issues a warning about such a case. - This bug afflicted all code compiled by version 2.7.2.2.f.2 of - `gcc' (C, C++, Fortran, and so on). - - * Fix a compiler crash that occurred in some cases of procedure - inlining. (Such cases became more frequent in 0.5.20.) - - * Fix a compiler crash resulting from using `DATA' or similar to - initialize a `COMPLEX' variable or array to zero. - - * Fix compiler crashes involving use of `AND', `OR', or `XOR' - intrinsics. - - * Fix compiler bug triggered when using a `COMMON' or `EQUIVALENCE' - variable as the target of an `ASSIGN' or assigned-`GOTO' statement. - - * Fix compiler crashes due to using the name of a some non-standard - intrinsics (such as `FTELL' or `FPUTC') as such and as the name of - a procedure or common block. Such dual use of a name in a program - is allowed by the standard. - - * Place automatic arrays on the stack, even if `SAVE' or the - `-fno-automatic' option is in effect. This avoids a compiler - crash in some cases. - - * The `-malign-double' option now reliably aligns `DOUBLE PRECISION' - optimally on Pentium and Pentium Pro architectures (586 and 686 in - `gcc'). - - * New option `-Wno-globals' disables warnings about "suspicious" use - of a name both as a global name and as the implicit name of an - intrinsic, and warnings about disagreements over the number or - natures of arguments passed to global procedures, or the natures - of the procedures themselves. - - The default is to issue such warnings, which are new as of this - version of `g77'. - - * New option `-fno-globals' disables diagnostics about potentially - fatal disagreements analysis problems, such as disagreements over - the number or natures of arguments passed to global procedures, or - the natures of those procedures themselves. - - The default is to issue such diagnostics and flag the compilation - as unsuccessful. With this option, the diagnostics are issued as - warnings, or, if `-Wno-globals' is specified, are not issued at - all. - - This option also disables inlining of global procedures, to avoid - compiler crashes resulting from coding errors that these - diagnostics normally would identify. - - * Diagnose cases where a reference to a procedure disagrees with the - type of that procedure, or where disagreements about the number or - nature of arguments exist. This avoids a compiler crash. - - * Fix parsing bug whereby `g77' rejected a second initialization - specification immediately following the first's closing `/' without - an intervening comma in a `DATA' statement, and the second - specification was an implied-DO list. - - * Improve performance of the `gcc' back end so certain complicated - expressions involving `COMPLEX' arithmetic (especially - multiplication) don't appear to take forever to compile. - - * Fix a couple of profiling-related bugs in `gcc' back end. - - * Integrate GNU Ada's (GNAT's) changes to the back end, which - consist almost entirely of bug fixes. These fixes are circa - version 3.10p of GNAT. - - * Include some other `gcc' fixes that seem useful in `g77''s version - of `gcc'. (See `gcc/ChangeLog' for details--compare it to that - file in the vanilla `gcc-2.7.2.3.tar.gz' distribution.) - - * Fix `libU77' routines that accept file and other names to strip - trailing blanks from them, for consistency with other - implementations. Blanks may be forcibly appended to such names by - appending a single null character (`CHAR(0)') to the significant - trailing blanks. - - * Fix `CHMOD' intrinsic to work with file names that have embedded - blanks, commas, and so on. - - * Fix `SIGNAL' intrinsic so it accepts an optional third `Status' - argument. - - * Fix `IDATE()' intrinsic subroutine (VXT form) so it accepts - arguments in the correct order. Documentation fixed accordingly, - and for `GMTIME()' and `LTIME()' as well. - - * Make many changes to `libU77' intrinsics to support existing code - more directly. - - Such changes include allowing both subroutine and function forms - of many routines, changing `MCLOCK()' and `TIME()' to return - `INTEGER(KIND=1)' values, introducing `MCLOCK8()' and `TIME8()' to - return `INTEGER(KIND=2)' values, and placing functions that are - intended to perform side effects in a new intrinsic group, - `badu77'. - - * Improve `libU77' so it is more portable. - - * Add options `-fbadu77-intrinsics-delete', - `-fbadu77-intrinsics-hide', and so on. - - * Fix crashes involving diagnosed or invalid code. - - * `g77' and `gcc' now do a somewhat better job detecting and - diagnosing arrays that are too large to handle before these cause - diagnostics during the assembler or linker phase, a compiler - crash, or generation of incorrect code. - - * Make some fixes to alias analysis code. - - * Add support for `restrict' keyword in `gcc' front end. - - * Support `gcc' version 2.7.2.3 (modified by `g77' into version - 2.7.2.3.f.1), and remove support for prior versions of `gcc'. - - * Incorporate GNAT's patches to the `gcc' back end into `g77''s, so - GNAT users do not need to apply GNAT's patches to build both GNAT - and `g77' from the same source tree. - - * Modify `make' rules and related code so that generation of Info - documentation doesn't require compilation using `gcc'. Now, any - ANSI C compiler should be adequate to produce the `g77' - documentation (in particular, the tables of intrinsics) from - scratch. - - * Add `INT2' and `INT8' intrinsics. - - * Add `CPU_TIME' intrinsic. - - * Add `ALARM' intrinsic. - - * `CTIME' intrinsic now accepts any `INTEGER' argument, not just - `INTEGER(KIND=2)'. - - * Warn when explicit type declaration disagrees with the type of an - intrinsic invocation. - - * Support `*f771' entry in `gcc' `specs' file. - - * Fix typo in `make' rule `g77-cross', used only for cross-compiling. - - * Fix `libf2c' build procedure to re-archive library if previous - attempt to archive was interrupted. - - * Change `gcc' to unroll loops only during the last invocation (of - as many as two invocations) of loop optimization. - - * Improve handling of `-fno-f2c' so that code that attempts to pass - an intrinsic as an actual argument, such as `CALL FOO(ABS)', is - rejected due to the fact that the run-time-library routine is, - effectively, compiled with `-ff2c' in effect. - - * Fix `g77' driver to recognize `-fsyntax-only' as an option that - inhibits linking, just like `-c' or `-S', and to recognize and - properly handle the `-nostdlib', `-M', `-MM', `-nodefaultlibs', - and `-Xlinker' options. - - * Upgrade to `libf2c' as of 1997-08-16. - - * Modify `libf2c' to consistently and clearly diagnose recursive I/O - (at run time). - - * `g77' driver now prints version information (such as produced by - `g77 -v') to `stderr' instead of `stdout'. - - * The `.r' suffix now designates a Ratfor source file, to be - preprocessed via the `ratfor' command, available separately. - - * Fix some aspects of how `gcc' determines what kind of system is - being configured and what kinds are supported. For example, GNU - Linux/Alpha ELF systems now are directly supported. - - * Improve diagnostics. - - * Improve documentation and indexing. - - * Include all pertinent files for `libf2c' that come from - `netlib.bell-labs.com'; give any such files that aren't quite - accurate in `g77''s version of `libf2c' the suffix `.netlib'. - - * Reserve `INTEGER(KIND=0)' for future use. - -In 0.5.20: -========== - - * The `-fno-typeless-boz' option is now the default. - - This option specifies that non-decimal-radix constants using the - prefixed-radix form (such as `Z'1234'') are to be interpreted as - `INTEGER' constants. Specify `-ftypeless-boz' to cause such - constants to be interpreted as typeless. - - (Version 0.5.19 introduced `-fno-typeless-boz' and its inverse.) - - * Options `-ff90-intrinsics-enable' and `-fvxt-intrinsics-enable' - now are the defaults. - - Some programs might use names that clash with intrinsic names - defined (and now enabled) by these options or by the new `libU77' - intrinsics. Users of such programs might need to compile them - differently (using, for example, `-ff90-intrinsics-disable') or, - better yet, insert appropriate `EXTERNAL' statements specifying - that these names are not intended to be names of intrinsics. - - * The `ALWAYS_FLUSH' macro is no longer defined when building - `libf2c', which should result in improved I/O performance, - especially over NFS. - - *Note:* If you have code that depends on the behavior of `libf2c' - when built with `ALWAYS_FLUSH' defined, you will have to modify - `libf2c' accordingly before building it from this and future - versions of `g77'. - - * Dave Love's implementation of `libU77' has been added to the - version of `libf2c' distributed with and built as part of `g77'. - `g77' now knows about the routines in this library as intrinsics. - - * New option `-fvxt' specifies that the source file is written in - VXT Fortran, instead of GNU Fortran. - - * The `-fvxt-not-f90' option has been deleted, along with its - inverse, `-ff90-not-vxt'. - - If you used one of these deleted options, you should re-read the - pertinent documentation to determine which options, if any, are - appropriate for compiling your code with this version of `g77'. - - * The `-fugly' option now issues a warning, as it likely will be - removed in a future version. - - (Enabling all the `-fugly-*' options is unlikely to be feasible, - or sensible, in the future, so users should learn to specify only - those `-fugly-*' options they really need for a particular source - file.) - - * The `-fugly-assumed' option, introduced in version 0.5.19, has - been changed to better accommodate old and new code. - - * Make a number of fixes to the `g77' front end and the `gcc' back - end to better support Alpha (AXP) machines. This includes - providing at least one bug-fix to the `gcc' back end for Alphas. - - * Related to supporting Alpha (AXP) machines, the `LOC()' intrinsic - and `%LOC()' construct now return values of integer type that is - the same width (holds the same number of bits) as the pointer type - on the machine. - - On most machines, this won't make a difference, whereas on Alphas, - the type these constructs return is `INTEGER*8' instead of the - more common `INTEGER*4'. - - * Emulate `COMPLEX' arithmetic in the `g77' front end, to avoid bugs - in `complex' support in the `gcc' back end. New option - `-fno-emulate-complex' causes `g77' to revert the 0.5.19 behavior. - - * Fix bug whereby `REAL A(1)', for example, caused a compiler crash - if `-fugly-assumed' was in effect and A was a local (automatic) - array. That case is no longer affected by the new handling of - `-fugly-assumed'. - - * Fix `g77' command driver so that `g77 -o foo.f' no longer deletes - `foo.f' before issuing other diagnostics, and so the `-x' option - is properly handled. - - * Enable inlining of subroutines and functions by the `gcc' back end. - This works as it does for `gcc' itself--program units may be - inlined for invocations that follow them in the same program unit, - as long as the appropriate compile-time options are specified. - - * Dummy arguments are no longer assumed to potentially alias - (overlap) other dummy arguments or `COMMON' areas when any of - these are defined (assigned to) by Fortran code. - - This can result in faster and/or smaller programs when compiling - with optimization enabled, though on some systems this effect is - observed only when `-fforce-addr' also is specified. - - New options `-falias-check', `-fargument-alias', - `-fargument-noalias', and `-fno-argument-noalias-global' control - the way `g77' handles potential aliasing. - - * The `CONJG()' and `DCONJG()' intrinsics now are compiled in-line. - - * The bug-fix for 0.5.19.1 has been re-done. The `g77' compiler has - been changed back to assume `libf2c' has no aliasing problems in - its implementations of the `COMPLEX' (and `DOUBLE COMPLEX') - intrinsics. The `libf2c' has been changed to have no such - problems. - - As a result, 0.5.20 is expected to offer improved performance over - 0.5.19.1, perhaps as good as 0.5.19 in most or all cases, due to - this change alone. - - *Note:* This change requires version 0.5.20 of `libf2c', at least, - when linking code produced by any versions of `g77' other than - 0.5.19.1. Use `g77 -v' to determine the version numbers of the - `libF77', `libI77', and `libU77' components of the `libf2c' - library. (If these version numbers are not printed--in - particular, if the linker complains about unresolved references to - names like `g77__fvers__'--that strongly suggests your - installation has an obsolete version of `libf2c'.) - - * New option `-fugly-assign' specifies that the same memory - locations are to be used to hold the values assigned by both - statements `I = 3' and `ASSIGN 10 TO I', for example. (Normally, - `g77' uses a separate memory location to hold assigned statement - labels.) - - * `FORMAT' and `ENTRY' statements now are allowed to precede - `IMPLICIT NONE' statements. - - * Produce diagnostic for unsupported `SELECT CASE' on `CHARACTER' - type, instead of crashing, at compile time. - - * Fix crashes involving diagnosed or invalid code. - - * Change approach to building `libf2c' archive (`libf2c.a') so that - members are added to it only when truly necessary, so the user - that installs an already-built `g77' doesn't need to have write - access to the build tree (whereas the user doing the build might - not have access to install new software on the system). - - * Support `gcc' version 2.7.2.2 (modified by `g77' into version - 2.7.2.2.f.2), and remove support for prior versions of `gcc'. - - * Upgrade to `libf2c' as of 1997-02-08, and fix up some of the build - procedures. - - * Improve general build procedures for `g77', fixing minor bugs - (such as deletion of any file named `f771' in the parent directory - of `gcc/'). - - * Enable full support of `INTEGER*8' available in `libf2c' and - `f2c.h' so that `f2c' users may make full use of its features via - the `g77' version of `f2c.h' and the `INTEGER*8' support routines - in the `g77' version of `libf2c'. - - * Improve `g77' driver and `libf2c' so that `g77 -v' yields version - information on the library. - - * The `SNGL' and `FLOAT' intrinsics now are specific intrinsics, - instead of synonyms for the generic intrinsic `REAL'. - - * New intrinsics have been added. These are `REALPART', `IMAGPART', - `COMPLEX', `LONG', and `SHORT'. - - * A new group of intrinsics, `gnu', has been added to contain the - new `REALPART', `IMAGPART', and `COMPLEX' intrinsics. An old - group, `dcp', has been removed. - - * Complain about industry-wide ambiguous references `REAL(EXPR)' and - `AIMAG(EXPR)', where EXPR is `DOUBLE COMPLEX' (or any complex type - other than `COMPLEX'), unless `-ff90' option specifies Fortran 90 - interpretation or new `-fugly-complex' option, in conjunction with - `-fnot-f90', specifies `f2c' interpretation. - - * Make improvements to diagnostics. - - * Speed up compiler a bit. - - * Improvements to documentation and indexing, including a new - chapter containing information on one, later more, diagnostics - that users are directed to pull up automatically via a message in - the diagnostic itself. - - (Hence the menu item `M' for the node `Diagnostics' in the - top-level menu of the Info documentation.) - -In 0.5.19.1: -============ - - * Code-generation bugs afflicting operations on complex data have - been fixed. - - These bugs occurred when assigning the result of an operation to a - complex variable (or array element) that also served as an input - to that operation. - - The operations affected by this bug were: `CONJG()', `DCONJG()', - `CCOS()', `CDCOS()', `CLOG()', `CDLOG()', `CSIN()', `CDSIN()', - `CSQRT()', `CDSQRT()', complex division, and raising a `DOUBLE - COMPLEX' operand to an `INTEGER' power. (The related generic and - `Z'-prefixed intrinsics, such as `ZSIN()', also were affected.) - - For example, `C = CSQRT(C)', `Z = Z/C', and `Z = Z**I' (where `C' - is `COMPLEX' and `Z' is `DOUBLE COMPLEX') have been fixed. - -In 0.5.19: -========== - - * Fix `FORMAT' statement parsing so negative values for specifiers - such as `P' (e.g. `FORMAT(-1PF8.1)') are correctly processed as - negative. - - * Fix `SIGNAL' intrinsic so it once again accepts a procedure as its - second argument. - - * A temporary kludge option provides bare-bones information on - `COMMON' and `EQUIVALENCE' members at debug time. - - * New `-fonetrip' option specifies FORTRAN-66-style one-trip `DO' - loops. - - * New `-fno-silent' option causes names of program units to be - printed as they are compiled, in a fashion similar to UNIX `f77' - and `f2c'. - - * New `-fugly-assumed' option specifies that arrays dimensioned via - `DIMENSION X(1)', for example, are to be treated as assumed-size. - - * New `-fno-typeless-boz' option specifies that non-decimal-radix - constants using the prefixed-radix form (such as `Z'1234'') are to - be interpreted as `INTEGER' constants. - - * New `-ff66' option is a "shorthand" option that specifies - behaviors considered appropriate for FORTRAN 66 programs. - - * New `-ff77' option is a "shorthand" option that specifies - behaviors considered appropriate for UNIX `f77' programs. - - * New `-fugly-comma' and `-fugly-logint' options provided to perform - some of what `-fugly' used to do. `-fugly' and `-fno-ugly' are - now "shorthand" options, in that they do nothing more than enable - (or disable) other `-fugly-*' options. - - * Fix parsing of assignment statements involving targets that are - substrings of elements of `CHARACTER' arrays having names such as - `READ', `WRITE', `GOTO', and `REALFUNCTIONFOO'. - - * Fix crashes involving diagnosed code. - - * Fix handling of local `EQUIVALENCE' areas so certain cases of - valid Fortran programs are not misdiagnosed as improperly - extending the area backwards. - - * Support `gcc' version 2.7.2.1. - - * Upgrade to `libf2c' as of 1996-09-26, and fix up some of the build - procedures. - - * Change code generation for list-directed I/O so it allows for new - versions of `libf2c' that might return non-zero status codes for - some operations previously assumed to always return zero. - - This change not only affects how `IOSTAT=' variables are set by - list-directed I/O, it also affects whether `END=' and `ERR=' - labels are reached by these operations. - - * Add intrinsic support for new `FTELL' and `FSEEK' procedures in - `libf2c'. - - * Modify `fseek_()' in `libf2c' to be more portable (though, in - practice, there might be no systems where this matters) and to - catch invalid `whence' arguments. - - * Some useless warnings from the `-Wunused' option have been - eliminated. - - * Fix a problem building the `f771' executable on AIX systems by - linking with the `-bbigtoc' option. - - * Abort configuration if `gcc' has not been patched using the patch - file provided in the `gcc/f/gbe/' subdirectory. - - * Add options `--help' and `--version' to the `g77' command, to - conform to GNU coding guidelines. Also add printing of `g77' - version number when the `--verbose' (`-v') option is used. - - * Change internally generated name for local `EQUIVALENCE' areas to - one based on the alphabetically sorted first name in the list of - names for entities placed at the beginning of the areas. - - * Improvements to documentation and indexing. - -In 0.5.18: -========== - - * Add some rudimentary support for `INTEGER*1', `INTEGER*2', - `INTEGER*8', and their `LOGICAL' equivalents. (This support works - on most, maybe all, `gcc' targets.) - - Thanks to Scott Snyder (<snyder@d0sgif.fnal.gov>) for providing - the patch for this! - - Among the missing elements from the support for these features are - full intrinsic support and constants. - - * Add some rudimentary support for the `BYTE' and `WORD' - type-declaration statements. `BYTE' corresponds to `INTEGER*1', - while `WORD' corresponds to `INTEGER*2'. - - Thanks to Scott Snyder (<snyder@d0sgif.fnal.gov>) for providing - the patch for this! - - * The compiler code handling intrinsics has been largely rewritten - to accommodate the new types. No new intrinsics or arguments for - existing intrinsics have been added, so there is, at this point, - no intrinsic to convert to `INTEGER*8', for example. - - * Support automatic arrays in procedures. - - * Reduce space/time requirements for handling large *sparsely* - initialized aggregate arrays. This improvement applies to only a - subset of the general problem to be addressed in 0.6. - - * Treat initial values of zero as if they weren't specified (in DATA - and type-declaration statements). The initial values will be set - to zero anyway, but the amount of compile time processing them - will be reduced, in some cases significantly (though, again, this - is only a subset of the general problem to be addressed in 0.6). - - A new option, `-fzeros', is introduced to enable the traditional - treatment of zeros as any other value. - - * With `-ff90' in force, `g77' incorrectly interpreted `REAL(Z)' as - returning a `REAL' result, instead of as a `DOUBLE PRECISION' - result. (Here, `Z' is `DOUBLE COMPLEX'.) - - With `-fno-f90' in force, the interpretation remains unchanged, - since this appears to be how at least some F77 code using the - `DOUBLE COMPLEX' extension expected it to work. - - Essentially, `REAL(Z)' in F90 is the same as `DBLE(Z)', while in - extended F77, it appears to be the same as `REAL(REAL(Z))'. - - * An expression involving exponentiation, where both operands were - type `INTEGER' and the right-hand operand was negative, was - erroneously evaluated. - - * Fix bugs involving `DATA' implied-`DO' constructs (these involved - an errant diagnostic and a crash, both on good code, one involving - subsequent statement-function definition). - - * Close `INCLUDE' files after processing them, so compiling source - files with lots of `INCLUDE' statements does not result in being - unable to open `INCLUDE' files after all the available file - descriptors are used up. - - * Speed up compiling, especially of larger programs, and perhaps - slightly reduce memory utilization while compiling (this is *not* - the improvement planned for 0.6 involving large aggregate - areas)--these improvements result from simply turning off some - low-level code to do self-checking that hasn't been triggered in a - long time. - - * Introduce three new options that implement optimizations in the - `gcc' back end (GBE). These options are `-fmove-all-movables', - `-freduce-all-givs', and `-frerun-loop-opt', which are enabled, by - default, for Fortran compilations. These optimizations are - intended to help toon Fortran programs. - - * Patch the GBE to do a better job optimizing certain kinds of - references to array elements. - - * Due to patches to the GBE, the version number of `gcc' also is - patched to make it easier to manage installations, especially - useful if it turns out a `g77' change to the GBE has a bug. - - The `g77'-modified version number is the `gcc' version number with - the string `.f.N' appended, where `f' identifies the version as - enhanced for Fortran, and N is `1' for the first Fortran patch for - that version of `gcc', `2' for the second, and so on. - - So, this introduces version 2.7.2.f.1 of `gcc'. - - * Make several improvements and fixes to diagnostics, including the - removal of two that were inappropriate or inadequate. - - * Warning about two successive arithmetic operators, produced by - `-Wsurprising', now produced *only* when both operators are, - indeed, arithmetic (not relational/boolean). - - * `-Wsurprising' now warns about the remaining cases of using - non-integral variables for implied-`DO' loops, instead of these - being rejected unless `-fpedantic' or `-fugly' specified. - - * Allow `SAVE' of a local variable or array, even after it has been - given an initial value via `DATA', for example. - - * Introduce an Info version of `g77' documentation, which supercedes - `gcc/f/CREDITS', `gcc/f/DOC', and `gcc/f/PROJECTS'. These files - will be removed in a future release. The files `gcc/f/BUGS', - `gcc/f/INSTALL', and `gcc/f/NEWS' now are automatically built from - the texinfo source when distributions are made. - - This effort was inspired by a first pass at translating - `g77-0.5.16/f/DOC' that was contributed to Craig by David Ronis - (<ronis@onsager.chem.mcgill.ca>). - - * New `-fno-second-underscore' option to specify that, when - `-funderscoring' is in effect, a second underscore is not to be - appended to Fortran names already containing an underscore. - - * Change the way iterative `DO' loops work to follow the F90 - standard. In particular, calculation of the iteration count is - still done by converting the start, end, and increment parameters - to the type of the `DO' variable, but the result of the - calculation is always converted to the default `INTEGER' type. - - (This should have no effect on existing code compiled by `g77', - but code written to assume that use of a *wider* type for the `DO' - variable will result in an iteration count being fully calculated - using that wider type (wider than default `INTEGER') must be - rewritten.) - - * Support `gcc' version 2.7.2. - - * Upgrade to `libf2c' as of 1996-03-23, and fix up some of the build - procedures. - - Note that the email addresses related to `f2c' have changed--the - distribution site now is named `netlib.bell-labs.com', and the - maintainer's new address is <dmg@bell-labs.com>. - -In 0.5.17: -========== - - * *Fix serious bug* in `g77 -v' command that can cause removal of a - system's `/dev/null' special file if run by user `root'. - - *All users* of version 0.5.16 should ensure that they have not - removed `/dev/null' or replaced it with an ordinary file (e.g. by - comparing the output of `ls -l /dev/null' with `ls -l /dev/zero'. - If the output isn't basically the same, contact your system - administrator about restoring `/dev/null' to its proper status). - - This bug is particularly insidious because removing `/dev/null' as - a special file can go undetected for quite a while, aside from - various applications and programs exhibiting sudden, strange - behaviors. - - I sincerely apologize for not realizing the implications of the - fact that when `g77 -v' runs the `ld' command with `-o /dev/null' - that `ld' tries to *remove* the executable it is supposed to build - (especially if it reports unresolved references, which it should - in this case)! - - * Fix crash on `CHARACTER*(*) FOO' in a main or block data program - unit. - - * Fix crash that can occur when diagnostics given outside of any - program unit (such as when input file contains `@foo'). - - * Fix crashes, infinite loops (hangs), and such involving diagnosed - code. - - * Fix `ASSIGN''ed variables so they can be `SAVE''d or dummy - arguments, and issue clearer error message in cases where target - of `ASSIGN' or `ASSIGN'ed `GOTO'/`FORMAT' is too small (which - should never happen). - - * Make `libf2c' build procedures work on more systems again by - eliminating unnecessary invocations of `ld -r -x' and `mv'. - - * Fix omission of `-funix-intrinsics-...' options in list of - permitted options to compiler. - - * Fix failure to always diagnose missing type declaration for - `IMPLICIT NONE'. - - * Fix compile-time performance problem (which could sometimes crash - the compiler, cause a hang, or whatever, due to a bug in the back - end) involving exponentiation with a large `INTEGER' constant for - the right-hand operator (e.g. `I**32767'). - - * Fix build procedures so cross-compiling `g77' (the `fini' utility - in particular) is properly built using the host compiler. - - * Add new `-Wsurprising' option to warn about constructs that are - interpreted by the Fortran standard (and `g77') in ways that are - surprising to many programmers. - - * Add `ERF()' and `ERFC()' as generic intrinsics mapping to existing - `ERF'/`DERF' and `ERFC'/`DERFC' specific intrinsics. - - *Note:* You should specify `INTRINSIC ERF,ERFC' in any code where - you might use these as generic intrinsics, to improve likelihood - of diagnostics (instead of subtle run-time bugs) when using a - compiler that doesn't support these as intrinsics (e.g. `f2c'). - - * Remove from `-fno-pedantic' the diagnostic about `DO' with - non-`INTEGER' index variable; issue that under `-Wsurprising' - instead. - - * Clarify some diagnostics that say things like "ignored" when that's - misleading. - - * Clarify diagnostic on use of `.EQ.'/`.NE.' on `LOGICAL' operands. - - * Minor improvements to code generation for various operations on - `LOGICAL' operands. - - * Minor improvement to code generation for some `DO' loops on some - machines. - - * Support `gcc' version 2.7.1. - - * Upgrade to `libf2c' as of 1995-11-15. - -In 0.5.16: -========== - - * Fix a code-generation bug involving complicated `EQUIVALENCE' - statements not involving `COMMON'. - - * Fix code-generation bugs involving invoking "gratis" library - procedures in `libf2c' from code compiled with `-fno-f2c' by - making these procedures known to `g77' as intrinsics (not affected - by -fno-f2c). This is known to fix code invoking `ERF()', - `ERFC()', `DERF()', and `DERFC()'. - - * Update `libf2c' to include netlib patches through 1995-08-16, and - `#define' `WANT_LEAD_0' to 1 to make `g77'-compiled code more - consistent with other Fortran implementations by outputting - leading zeros in formatted and list-directed output. - - * Fix a code-generation bug involving adjustable dummy arrays with - high bounds whose primaries are changed during procedure - execution, and which might well improve code-generation - performance for such arrays compared to `f2c' plus `gcc' (but - apparently only when using `gcc-2.7.0' or later). - - * Fix a code-generation bug involving invocation of `COMPLEX' and - `DOUBLE COMPLEX' `FUNCTION's and doing `COMPLEX' and `DOUBLE - COMPLEX' divides, when the result of the invocation or divide is - assigned directly to a variable that overlaps one or more of the - arguments to the invocation or divide. - - * Fix crash by not generating new optimal code for `X**I' if `I' is - nonconstant and the expression is used to dimension a dummy array, - since the `gcc' back end does not support the necessary mechanics - (and the `gcc' front end rejects the equivalent construct, as it - turns out). - - * Fix crash on expressions like `COMPLEX**INTEGER'. - - * Fix crash on expressions like `(1D0,2D0)**2', i.e. raising a - `DOUBLE COMPLEX' constant to an `INTEGER' constant power. - - * Fix crashes and such involving diagnosed code. - - * Diagnose, instead of crashing on, statement function definitions - having duplicate dummy argument names. - - * Fix bug causing rejection of good code involving statement function - definitions. - - * Fix bug resulting in debugger not knowing size of local equivalence - area when any member of area has initial value (via `DATA', for - example). - - * Fix installation bug that prevented installation of `g77' driver. - Provide for easy selection of whether to install copy of `g77' as - `f77' to replace the broken code. - - * Fix `gcc' driver (affects `g77' thereby) to not gratuitously - invoke the `f771' program (e.g. when `-E' is specified). - - * Fix diagnostic to point to correct source line when it immediately - follows an `INCLUDE' statement. - - * Support more compiler options in `gcc'/`g77' when compiling - Fortran files. These options include `-p', `-pg', `-aux-info', - `-P', correct setting of version-number macros for preprocessing, - full recognition of `-O0', and automatic insertion of - configuration-specific linker specs. - - * Add new intrinsics that interface to existing routines in `libf2c': - `ABORT', `DERF', `DERFC', `ERF', `ERFC', `EXIT', `FLUSH', - `GETARG', `GETENV', `IARGC', `SIGNAL', and `SYSTEM'. Note that - `ABORT', `EXIT', `FLUSH', `SIGNAL', and `SYSTEM' are intrinsic - subroutines, not functions (since they have side effects), so to - get the return values from `SIGNAL' and `SYSTEM', append a final - argument specifying an `INTEGER' variable or array element (e.g. - `CALL SYSTEM('rm foo',ISTAT)'). - - * Add new intrinsic group named `unix' to contain the new intrinsics, - and by default enable this new group. - - * Move `LOC()' intrinsic out of the `vxt' group to the new `unix' - group. - - * Improve `g77' so that `g77 -v' by itself (or with certain other - options, including `-B', `-b', `-i', `-nostdlib', and `-V') - reports lots more useful version info, and so that long-form - options `gcc' accepts are understood by `g77' as well (even in - truncated, unambiguous forms). - - * Add new `g77' option `--driver=name' to specify driver when - default, `gcc', isn't appropriate. - - * Add support for `#' directives (as output by the preprocessor) in - the compiler, and enable generation of those directives by the - preprocessor (when compiling `.F' files) so diagnostics and - debugging info are more useful to users of the preprocessor. - - * Produce better diagnostics, more like `gcc', with info such as `In - function `foo':' and `In file included from...:'. - - * Support `gcc''s `-fident' and `-fno-ident' options. - - * When `-Wunused' in effect, don't warn about local variables used as - statement-function dummy arguments or `DATA' implied-`DO' iteration - variables, even though, strictly speaking, these are not uses of - the variables themselves. - - * When `-W -Wunused' in effect, don't warn about unused dummy - arguments at all, since there's no way to turn this off for - individual cases (`g77' might someday start warning about - these)--applies to `gcc' versions 2.7.0 and later, since earlier - versions didn't warn about unused dummy arguments. - - * New option `-fno-underscoring' that inhibits transformation of - names (by appending one or two underscores) so users may experiment - with implications of such an environment. - - * Minor improvement to `gcc/f/info' module to make it easier to build - `g77' using the native (non-`gcc') compiler on certain machines - (but definitely not all machines nor all non-`gcc' compilers). - Please do not report bugs showing problems compilers have with - macros defined in `gcc/f/target.h' and used in places like - `gcc/f/expr.c'. - - * Add warning to be printed for each invocation of the compiler if - the target machine `INTEGER', `REAL', or `LOGICAL' size is not 32 - bits, since `g77' is known to not work well for such cases (to be - fixed in Version 0.6--*note Actual Bugs We Haven't Fixed Yet: - Actual Bugs.). - - * Lots of new documentation (though work is still needed to put it - into canonical GNU format). - - * Build `libf2c' with `-g0', not `-g2', in effect (by default), to - produce smaller library without lots of debugging clutter. - -In 0.5.15: -========== - - * Fix bad code generation involving `X**I' and temporary, internal - variables generated by `g77' and the back end (such as for `DO' - loops). - - * Fix crash given `CHARACTER A;DATA A/.TRUE./'. - - * Replace crash with diagnostic given `CHARACTER A;DATA A/1.0/'. - - * Fix crash or other erratic behavior when null character constant - (`''') is encountered. - - * Fix crash or other erratic behavior involving diagnosed code. - - * Fix code generation for external functions returning type `REAL' - when the `-ff2c' option is in force (which it is by default) so - that `f2c' compatibility is indeed provided. - - * Disallow `COMMON I(10)' if `I' has previously been specified with - an array declarator. - - * New `-ffixed-line-length-N' option, where N is the maximum length - of a typical fixed-form line, defaulting to 72 columns, such that - characters beyond column N are ignored, or N is `none', meaning no - characters are ignored. does not affect lines with `&' in column - 1, which are always processed as if `-ffixed-line-length-none' was - in effect. - - * No longer generate better code for some kinds of array references, - as `gcc' back end is to be fixed to do this even better, and it - turned out to slow down some code in some cases after all. - - * In `COMMON' and `EQUIVALENCE' areas with any members given initial - values (e.g. via `DATA'), uninitialized members now always - initialized to binary zeros (though this is not required by the - standard, and might not be done in future versions of `g77'). - Previously, in some `COMMON'/`EQUIVALENCE' areas (essentially - those with members of more than one type), the uninitialized - members were initialized to spaces, to cater to `CHARACTER' types, - but it seems no existing code expects that, while much existing - code expects binary zeros. - -In 0.5.14: -========== - - * Don't emit bad code when low bound of adjustable array is - nonconstant and thus might vary as an expression at run time. - - * Emit correct code for calculation of number of trips in `DO' loops - for cases where the loop should not execute at all. (This bug - affected cases where the difference between the begin and end - values was less than the step count, though probably not for - floating-point cases.) - - * Fix crash when extra parentheses surround item in `DATA' - implied-`DO' list. - - * Fix crash over minor internal inconsistencies in handling - diagnostics, just substitute dummy strings where necessary. - - * Fix crash on some systems when compiling call to `MVBITS()' - intrinsic. - - * Fix crash on array assignment `TYPEDDD(...)=...', where DDD is a - string of one or more digits. - - * Fix crash on `DCMPLX()' with a single `INTEGER' argument. - - * Fix various crashes involving code with diagnosed errors. - - * Support `-I' option for `INCLUDE' statement, plus `gcc''s - `header.gcc' facility for handling systems like MS-DOS. - - * Allow `INCLUDE' statement to be continued across multiple lines, - even allow it to coexist with other statements on the same line. - - * Incorporate Bellcore fixes to `libf2c' through 1995-03-15--this - fixes a bug involving infinite loops reading EOF with empty - list-directed I/O list. - - * Remove all the `g77'-specific auto-configuration scripts, code, - and so on, except for temporary substitutes for bsearch() and - strtoul(), as too many configure/build problems were reported in - these areas. People will have to fix their systems' problems - themselves, or at least somewhere other than `g77', which expects - a working ANSI C environment (and, for now, a GNU C compiler to - compile `g77' itself). - - * Complain if initialized common redeclared as larger in subsequent - program unit. - - * Warn if blank common initialized, since its size can vary and hence - related warnings that might be helpful won't be seen. - - * New `-fbackslash' option, on by default, that causes `\' within - `CHARACTER' and Hollerith constants to be interpreted a la GNU C. - Note that this behavior is somewhat different from `f2c''s, which - supports only a limited subset of backslash (escape) sequences. - - * Make `-fugly-args' the default. - - * New `-fugly-init' option, on by default, that allows - typeless/Hollerith to be specified as initial values for variables - or named constants (`PARAMETER'), and also allows - character<->numeric conversion in those contexts--turn off via - `-fno-ugly-init'. - - * New `-finit-local-zero' option to initialize local variables to - binary zeros. This does not affect whether they are `SAVE'd, i.e. - made automatic or static. - - * New `-Wimplicit' option to warn about implicitly typed variables, - arrays, and functions. (Basically causes all program units to - default to `IMPLICIT NONE'.) - - * `-Wall' now implies `-Wuninitialized' as with `gcc' (i.e. unless - `-O' not specified, since `-Wuninitialized' requires `-O'), and - implies `-Wunused' as well. - - * `-Wunused' no longer gives spurious messages for unused `EXTERNAL' - names (since they are assumed to refer to block data program - units, to make use of libraries more reliable). - - * Support `%LOC()' and `LOC()' of character arguments. - - * Support null (zero-length) character constants and expressions. - - * Support `f2c''s `IMAG()' generic intrinsic. - - * Support `ICHAR()', `IACHAR()', and `LEN()' of character - expressions that are valid in assignments but not normally as - actual arguments. - - * Support `f2c'-style `&' in column 1 to mean continuation line. - - * Allow `NAMELIST', `EXTERNAL', `INTRINSIC', and `VOLATILE' in - `BLOCK DATA', even though these are not allowed by the standard. - - * Allow `RETURN' in main program unit. - - * Changes to Hollerith-constant support to obey Appendix C of the - standard: - - - Now padded on the right with zeros, not spaces. - - - Hollerith "format specifications" in the form of arrays of - non-character allowed. - - - Warnings issued when non-space truncation occurs when - converting to another type. - - - When specified as actual argument, now passed by reference to - `INTEGER' (padded on right with spaces if constant too small, - otherwise fully intact if constant wider the `INTEGER' type) - instead of by value. - - *Warning:* `f2c' differs on the interpretation of `CALL FOO(1HX)', - which it treats exactly the same as `CALL FOO('X')', but which the - standard and `g77' treat as `CALL FOO(%REF('X '))' (padded with - as many spaces as necessary to widen to `INTEGER'), essentially. - - * Changes and fixes to typeless-constant support: - - - Now treated as a typeless double-length `INTEGER' value. - - - Warnings issued when overflow occurs. - - - Padded on the left with zeros when converting to a larger - type. - - - Should be properly aligned and ordered on the target machine - for whatever type it is turned into. - - - When specified as actual argument, now passed as reference to - a default `INTEGER' constant. - - * `%DESCR()' of a non-`CHARACTER' expression now passes a pointer to - the expression plus a length for the expression just as if it were - a `CHARACTER' expression. For example, `CALL FOO(%DESCR(D))', - where `D' is `REAL*8', is the same as `CALL FOO(D,%VAL(8)))'. - - * Name of multi-entrypoint master function changed to incorporate - the name of the primary entry point instead of a decimal value, so - the name of the master function for `SUBROUTINE X' with alternate - entry points is now `__g77_masterfun_x'. - - * Remove redundant message about zero-step-count `DO' loops. - - * Clean up diagnostic messages, shortening many of them. - - * Fix typo in `g77' man page. - - * Clarify implications of constant-handling bugs in `f/BUGS'. - - * Generate better code for `**' operator with a right-hand operand of - type `INTEGER'. - - * Generate better code for `SQRT()' and `DSQRT()', also when - `-ffast-math' specified, enable better code generation for `SIN()' - and `COS()'. - - * Generate better code for some kinds of array references. - - * Speed up lexing somewhat (this makes the compilation phase - noticeably faster). - |