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diff --git a/gcc/config/mips/x-iris6 b/gcc/config/mips/x-iris6
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+# We force the use of the O32 ABI for two reasons.
+# 1) For consistency, because some versions of Irix 6 default to the O32 ABI
+#    and some versions default to the N64 ABI.
+# 2) To avoid SGI compiler bugs.  The v6.x and v7.0 compilers from SGI have
+#    bugs that cause gcc to be miscompiled when the N32 or N64 ABIs are used.
+#    The O32 ABI is known to be OK.
+CC = $(OLDCC)
+OLDCC = cc -32
+
+# Find all of the declarations from the header files
+FIXPROTO_DEFINES= -D__EXTENSIONS__  -D_SGI_SOURCE -D_LANGUAGE_C_PLUS_PLUS