bpo-38980: Only apply -fno-semantic-interposition if available (GH-22892)

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Petr Viktorin 2020-10-22 18:11:53 +02:00 committed by GitHub
parent b37c994e5a
commit c6d7e82d19
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3 changed files with 92 additions and 0 deletions

54
aclocal.m4 vendored
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@ -12,6 +12,60 @@
# PARTICULAR PURPOSE.
m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
# Check whether the given FLAG works with the current language's compiler
# or gives an error. (Warnings, however, are ignored)
#
# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
# success/failure.
#
# If EXTRA-FLAGS is defined, it is added to the current language's default
# flags (e.g. CFLAGS) when the check is done. The check is thus made with
# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
# force the compiler to issue an error when a bad flag is given.
#
# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
#
# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 6
AC_DEFUN([AX_CHECK_COMPILE_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])])
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
AS_VAR_IF(CACHEVAR,yes,
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_COMPILE_FLAGS
# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
# serial 11 (pkg-config-0.29.1)

36
configure vendored
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@ -6484,8 +6484,44 @@ if test "$Py_OPT" = 'true' ; then
DEF_MAKE_RULE="build_all"
case $CC in
*gcc*)
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -fno-semantic-interposition" >&5
$as_echo_n "checking whether C compiler accepts -fno-semantic-interposition... " >&6; }
if ${ax_cv_check_cflags___fno_semantic_interposition+:} false; then :
$as_echo_n "(cached) " >&6
else
ax_check_save_flags=$CFLAGS
CFLAGS="$CFLAGS -fno-semantic-interposition"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
ax_cv_check_cflags___fno_semantic_interposition=yes
else
ax_cv_check_cflags___fno_semantic_interposition=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
CFLAGS=$ax_check_save_flags
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fno_semantic_interposition" >&5
$as_echo "$ax_cv_check_cflags___fno_semantic_interposition" >&6; }
if test "x$ax_cv_check_cflags___fno_semantic_interposition" = xyes; then :
CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
else
:
fi
;;
esac

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@ -1320,8 +1320,10 @@ if test "$Py_OPT" = 'true' ; then
DEF_MAKE_RULE="build_all"
case $CC in
*gcc*)
AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
])
;;
esac