bpo-30104: Only use -fno-strict-aliasing on dtoa.c (#1340)
On clang, only compile dtoa.c with -fno-strict-aliasing, use strict
aliasing to compile all other C files.
diff --git a/configure b/configure
index 1c90d31..3e89bfa 100755
--- a/configure
+++ b/configure
@@ -668,6 +668,7 @@
UNIVERSAL_ARCH_FLAGS
CFLAGS_NODIST
BASECFLAGS
+CFLAGS_ALIASING
OPT
LLVM_PROF_FOUND
target_os
@@ -6829,13 +6830,7 @@
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"
+ CFLAGS_ALIASING="-fno-strict-aliasing"
fi
case $ac_cv_prog_cc_g in
@@ -6857,7 +6852,7 @@
;;
esac
- OPT="$OPT $STRICT_PROTO $ALIASING"
+ OPT="$OPT $STRICT_PROTO"
case $ac_sys_system in
SCO_SV*) OPT="$OPT -m486 -DSCO5"