bpo-38980: Only apply -fno-semantic-interposition if available (GH-22892)
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@ -12,6 +12,60 @@
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# PARTICULAR PURPOSE.
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m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
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#
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# DESCRIPTION
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#
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# Check whether the given FLAG works with the current language's compiler
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# or gives an error. (Warnings, however, are ignored)
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#
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# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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# success/failure.
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#
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# If EXTRA-FLAGS is defined, it is added to the current language's default
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# flags (e.g. CFLAGS) when the check is done. The check is thus made with
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# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
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# force the compiler to issue an error when a bad flag is given.
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#
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# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
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#
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# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
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# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 6
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AC_DEFUN([AX_CHECK_COMPILE_FLAG],
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[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
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AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
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AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
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ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
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_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
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AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
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[AS_VAR_SET(CACHEVAR,[yes])],
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[AS_VAR_SET(CACHEVAR,[no])])
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_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
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AS_VAR_IF(CACHEVAR,yes,
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[m4_default([$2], :)],
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[m4_default([$3], :)])
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AS_VAR_POPDEF([CACHEVAR])dnl
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])dnl AX_CHECK_COMPILE_FLAGS
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# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
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# serial 11 (pkg-config-0.29.1)
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@ -6484,8 +6484,44 @@ if test "$Py_OPT" = 'true' ; then
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DEF_MAKE_RULE="build_all"
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case $CC in
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*gcc*)
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -fno-semantic-interposition" >&5
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$as_echo_n "checking whether C compiler accepts -fno-semantic-interposition... " >&6; }
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if ${ax_cv_check_cflags___fno_semantic_interposition+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ax_check_save_flags=$CFLAGS
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CFLAGS="$CFLAGS -fno-semantic-interposition"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ax_cv_check_cflags___fno_semantic_interposition=yes
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else
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ax_cv_check_cflags___fno_semantic_interposition=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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CFLAGS=$ax_check_save_flags
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fno_semantic_interposition" >&5
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$as_echo "$ax_cv_check_cflags___fno_semantic_interposition" >&6; }
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if test "x$ax_cv_check_cflags___fno_semantic_interposition" = xyes; then :
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CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
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LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
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else
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:
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fi
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;;
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esac
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@ -1320,8 +1320,10 @@ if test "$Py_OPT" = 'true' ; then
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DEF_MAKE_RULE="build_all"
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case $CC in
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*gcc*)
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AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
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CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
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LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
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])
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;;
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esac
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