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

Detect when the "cc" compiler (and the $CC variable) is the Clang
compiler. The test is needed to add the -fno-strict-aliasing option
on FreeBSD where cc is clang.
This commit is contained in:
Victor Stinner 2017-04-21 12:35:24 +02:00 committed by GitHub
parent 28205b203a
commit 35f3d240ee
2 changed files with 42 additions and 16 deletions
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19
configure vendored
View File

@ -6812,18 +6812,31 @@ then
WRAP="-fwrapv" WRAP="-fwrapv"
fi fi
# Clang also needs -fwrapv
case $CC in case $CC in
*clang*) *clang*)
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" WRAP="-fwrapv"
# bpo-30104: Python/dtoa.c requires to be build with # bpo-30104: Python/dtoa.c requires to be build with
# -fno-strict-aliasing to fix compiler issue on the # -fno-strict-aliasing to fix compiler issue on the
# double/ULong[2] union using clang 4.0 and optimization level # double/ULong[2] union using clang 4.0 and optimization level
# -O2 or higher # -O2 or higher
# https://bugs.llvm.org//show_bug.cgi?id=31928 # https://bugs.llvm.org//show_bug.cgi?id=31928
ALIASING="-fno-strict-aliasing" ALIASING="-fno-strict-aliasing"
;; fi
esac
case $ac_cv_prog_cc_g in case $ac_cv_prog_cc_g in
yes) yes)

19
configure.ac
View File

@ -1452,18 +1452,31 @@ then
WRAP="-fwrapv" WRAP="-fwrapv"
fi fi
# Clang also needs -fwrapv
case $CC in case $CC in
*clang*) *clang*)
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" WRAP="-fwrapv"
# bpo-30104: Python/dtoa.c requires to be build with # bpo-30104: Python/dtoa.c requires to be build with
# -fno-strict-aliasing to fix compiler issue on the # -fno-strict-aliasing to fix compiler issue on the
# double/ULong[2] union using clang 4.0 and optimization level # double/ULong[2] union using clang 4.0 and optimization level
# -O2 or higher # -O2 or higher
# https://bugs.llvm.org//show_bug.cgi?id=31928 # https://bugs.llvm.org//show_bug.cgi?id=31928
ALIASING="-fno-strict-aliasing" ALIASING="-fno-strict-aliasing"
;; fi
esac
case $ac_cv_prog_cc_g in case $ac_cv_prog_cc_g in
yes) yes)