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bpo-30104: Use -fno-strict-aliasing on clang (#1221)
Python/dtoa.c is not compiled correctly with clang 4.0 and optimization level -O2 or higher, because of an aliasing issue on the double/ULong[2] union. LLVM bug report: https://bugs.llvm.org//show_bug.cgi?id=31928
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configure
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configure
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@ -6814,8 +6814,15 @@ then
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# Clang also needs -fwrapv
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case $CC in
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*clang*) WRAP="-fwrapv"
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;;
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*clang*)
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WRAP="-fwrapv"
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# bpo-30104: Python/dtoa.c requires to be build with
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# -fno-strict-aliasing to fix compiler issue on the
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# double/ULong[2] union using clang 4.0 and optimization level
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# -O2 or higher
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# https://bugs.llvm.org//show_bug.cgi?id=31928
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ALIASING="-fno-strict-aliasing"
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;;
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esac
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case $ac_cv_prog_cc_g in
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@ -6824,18 +6831,21 @@ then
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# Optimization messes up debuggers, so turn it off for
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# debug builds.
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if "$CC" -v --help 2>/dev/null |grep -- -Og > /dev/null; then
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OPT="-g -Og -Wall $STRICT_PROTO"
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OPT="-g -Og -Wall"
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else
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OPT="-g -O0 -Wall $STRICT_PROTO"
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OPT="-g -O0 -Wall"
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fi
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else
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OPT="-g $WRAP -O3 -Wall $STRICT_PROTO"
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OPT="-g $WRAP -O3 -Wall"
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fi
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;;
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*)
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OPT="-O3 -Wall $STRICT_PROTO"
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OPT="-O3 -Wall"
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;;
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esac
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OPT="$OPT $STRICT_PROTO $ALIASING"
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case $ac_sys_system in
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SCO_SV*) OPT="$OPT -m486 -DSCO5"
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;;
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configure.ac
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configure.ac
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@ -1454,8 +1454,15 @@ then
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# Clang also needs -fwrapv
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case $CC in
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*clang*) WRAP="-fwrapv"
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;;
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*clang*)
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WRAP="-fwrapv"
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# bpo-30104: Python/dtoa.c requires to be build with
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# -fno-strict-aliasing to fix compiler issue on the
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# double/ULong[2] union using clang 4.0 and optimization level
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# -O2 or higher
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# https://bugs.llvm.org//show_bug.cgi?id=31928
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ALIASING="-fno-strict-aliasing"
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;;
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esac
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case $ac_cv_prog_cc_g in
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@ -1464,18 +1471,21 @@ then
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# Optimization messes up debuggers, so turn it off for
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# debug builds.
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if "$CC" -v --help 2>/dev/null |grep -- -Og > /dev/null; then
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OPT="-g -Og -Wall $STRICT_PROTO"
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OPT="-g -Og -Wall"
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else
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OPT="-g -O0 -Wall $STRICT_PROTO"
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OPT="-g -O0 -Wall"
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fi
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else
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OPT="-g $WRAP -O3 -Wall $STRICT_PROTO"
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OPT="-g $WRAP -O3 -Wall"
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fi
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;;
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*)
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OPT="-O3 -Wall $STRICT_PROTO"
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OPT="-O3 -Wall"
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;;
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esac
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OPT="$OPT $STRICT_PROTO $ALIASING"
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case $ac_sys_system in
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SCO_SV*) OPT="$OPT -m486 -DSCO5"
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;;
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