1 files changed, 53 insertions, 0 deletions
diff --git a/gcc/fixinc.math b/gcc/fixinc.math
new file mode 100755
index 0000000..a8a9fe7
--- /dev/null
+++ b/gcc/fixinc.math
@@ -0,0 +1,53 @@
+#! /bin/sh
+# Fix struct exception in /usr/include/math.h.
+#
+# We expect several systems which did not need fixincludes in the past
+# to need to fix just math.h.  So we created a separate fixinc.math
+# script to fix just that problem.
+# See README-fixinc for more information.
+
+# Directory containing the original header files.
+# (This was named INCLUDES, but that conflicts with a name in Makefile.in.)
+INPUT=${2-${INPUT-/usr/include}}
+
+# Directory in which to store the results.
+LIB=${1?"fixincludes: output directory not specified"}
+
+# Make sure it exists.
+if [ ! -d $LIB ]; then
+  mkdir $LIB || exit 1
+fi
+
+echo Building fixed headers in ${LIB}
+
+# Some math.h files define struct exception, which conflicts with
+# the class exception defined in the C++ file std/stdexcept.h.  We
+# redefine it to __math_exception.  This is not a great fix, but I
+# haven't been able to think of anything better.
+file=math.h
+if [ -r $INPUT/$file ]; then
+  echo Checking $INPUT/$file
+  if grep 'struct exception' $INPUT/$file >/dev/null
+  then
+    echo Fixed $file
+    rm -f $LIB/$file
+    cat <<'__EOF__' >$LIB/$file
+#ifndef _MATH_H_WRAPPER
+#ifdef __cplusplus
+# define exception __math_exception
+#endif
+#include_next <math.h>
+#ifdef __cplusplus
+# undef exception
+#endif
+#define _MATH_H_WRAPPER
+#endif /* _MATH_H_WRAPPER */
+__EOF__
+    # Define _MATH_H_WRAPPER at the end of the wrapper, not the start,
+    # so that if #include_next gets another instance of the wrapper,
+    # this will follow the #include_next chain until we arrive at
+    # the real <math.h>.
+    chmod a+r $LIB/$file
+  fi
+fi
+exit 0