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bpo-30104: configure now detects when cc is clang #1233

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Merged
vstinner merged 1 commit into from
Apr 21, 2017
Merged

bpo-30104: configure now detects when cc is clang #1233

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29 changes: 21 additions & 8 deletions configure
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Original file line number Diff line number Diff line change
Expand Up @@ -6812,19 +6812,32 @@ then
WRAP="-fwrapv"
fi

# Clang also needs -fwrapv
case $CC in
*clang*)
WRAP="-fwrapv"
# bpo-30104: Python/dtoa.c requires to be build with
# -fno-strict-aliasing to fix compiler issue on the
# double/ULong[2] union using clang 4.0 and optimization level
# -O2 or higher
# https://bugs.llvm.org//show_bug.cgi?id=31928
ALIASING="-fno-strict-aliasing"
cc_is_clang=1
;;
*)
if $CC --version 2>&1 | grep -q clang
then
cc_is_clang=1
else
cc_is_clang=
fi
esac

if test -n "${cc_is_clang}"
then
# Clang also needs -fwrapv
WRAP="-fwrapv"

# bpo-30104: Python/dtoa.c requires to be build with
# -fno-strict-aliasing to fix compiler issue on the
# double/ULong[2] union using clang 4.0 and optimization level
# -O2 or higher
# https://bugs.llvm.org//show_bug.cgi?id=31928
ALIASING="-fno-strict-aliasing"
fi

case $ac_cv_prog_cc_g in
yes)
if test "$Py_DEBUG" = 'true' ; then
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29 changes: 21 additions & 8 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -1452,19 +1452,32 @@ then
WRAP="-fwrapv"
fi

# Clang also needs -fwrapv
case $CC in
*clang*)
WRAP="-fwrapv"
# bpo-30104: Python/dtoa.c requires to be build with
# -fno-strict-aliasing to fix compiler issue on the
# double/ULong[2] union using clang 4.0 and optimization level
# -O2 or higher
# https://bugs.llvm.org//show_bug.cgi?id=31928
ALIASING="-fno-strict-aliasing"
cc_is_clang=1
;;
*)
if $CC --version 2>&1 | grep -q clang
then
cc_is_clang=1
else
cc_is_clang=
fi
esac

if test -n "${cc_is_clang}"
then
# Clang also needs -fwrapv
WRAP="-fwrapv"

# bpo-30104: Python/dtoa.c requires to be build with
# -fno-strict-aliasing to fix compiler issue on the
# double/ULong[2] union using clang 4.0 and optimization level
# -O2 or higher
# https://bugs.llvm.org//show_bug.cgi?id=31928
ALIASING="-fno-strict-aliasing"
fi

case $ac_cv_prog_cc_g in
yes)
if test "$Py_DEBUG" = 'true' ; then
Expand Down