8000 Disable excessive FP optimization by recent versions of gcc. · jcsston/postgres@01e80a0 · GitHub
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Disable excessive FP optimization by recent versions of gcc.
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.
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‎configure

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@@ -4054,6 +4054,56 @@ sed 's/^/| /' conftest.$ac_ext >&5
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echo "${ECHO_T}no" >&6; }
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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# Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
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{ echo "$as_me:$LINENO: checking if $CC supports -fexcess-precision=standard" >&5
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echo $ECHO_N "checking if $CC supports -fexcess-precision=standard... $ECHO_C" >&6; }
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pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS -fexcess-precision=standard"
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_compile") 2>conftest.er1
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ac_status=$?
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grep -v '^ *+' conftest.er1 >conftest.err
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rm -f conftest.er1
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cat conftest.err >&5
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } && {
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test -z "$ac_c_werror_flag" ||
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test ! -s conftest.err
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} && test -s conftest.$ac_objext; then
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{ echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6; }
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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CFLAGS="$pgac_save_CFLAGS"
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{ echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6; }
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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elif test "$ICC" = yes; then

‎configure.in

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@@ -433,6 +433,8 @@ if test "$GCC" = yes -a "$ICC" = no; then
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PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
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# Disable optimizations that assume no overflow; needed for gcc 4.3+
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PGAC_PROG_CC_CFLAGS_OPT([-fwrapv])
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# Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
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PGAC_PROG_CC_CFLAGS_OPT([-fexcess-precision=standard])
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elif test "$ICC" = yes; then
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# Intel's compiler has a bug/misoptimization in checking for
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# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.

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