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Disable excessive FP optimization by recent versions of gcc.

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Suggested solution from Tom Lane. Problem discovered, probably not
for the first time, while testing the mingw-w64 32 bit compiler.

Backpatched to all live branches.
This commit is contained in:
Andrew Dunstan
2011-12-14 17:14:21 -05:00
parent 6cf639dfbd
commit 24b96804d5
2 changed files with 63 additions and 0 deletions
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2
configure.in
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@ -436,6 +436,8 @@ if test "$GCC" = yes -a "$ICC" = no; then
PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
# Disable optimizations that assume no overflow; needed for gcc 4.3+
PGAC_PROG_CC_CFLAGS_OPT([-fwrapv])
# Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
PGAC_PROG_CC_CFLAGS_OPT([-fexcess-precision=standard])
elif test "$ICC" = yes; then
# Intel's compiler has a bug/misoptimization in checking for
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.