81 lines
2.6 KiB
Plaintext
81 lines
2.6 KiB
Plaintext
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_add_fortify_source.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_ADD_FORTIFY_SOURCE
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#
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# DESCRIPTION
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#
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# Check whether -D_FORTIFY_SOURCE=2 can be added to CPPFLAGS without macro
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# redefinition warnings, other cpp warnings or linker. Some distributions
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# (such as Gentoo Linux) enable _FORTIFY_SOURCE globally in their
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# compilers, leading to unnecessary warnings in the form of
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#
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# <command-line>:0:0: error: "_FORTIFY_SOURCE" redefined [-Werror]
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# <built-in>: note: this is the location of the previous definition
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#
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# which is a problem if -Werror is enabled. This macro checks whether
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# _FORTIFY_SOURCE is already defined, and if not, adds -D_FORTIFY_SOURCE=2
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# to CPPFLAGS.
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#
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# Newer mingw-w64 msys2 package comes with a bug in
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# headers-git-7.0.0.5546.d200317d-1. It broke -D_FORTIFY_SOURCE support,
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# and would need -lssp or -fstack-protector. See
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# https://github.com/msys2/MINGW-packages/issues/5803. Try to actually
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# link it.
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#
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# LICENSE
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#
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# Copyright (c) 2017 David Seifert <soap@gentoo.org>
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# Copyright (c) 2019 Reini Urban <rurban@cpan.org>
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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 4
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AC_DEFUN([AX_ADD_FORTIFY_SOURCE],[
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ac_save_cflags=$CFLAGS
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ac_cwerror_flag=yes
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AX_CHECK_COMPILE_FLAG([-Werror],[CFLAGS="$CFLAGS -Werror"])
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AC_MSG_CHECKING([whether to add -D_FORTIFY_SOURCE=2 to CPPFLAGS])
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AC_LINK_IFELSE([
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AC_LANG_PROGRAM([],
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[[
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#ifndef _FORTIFY_SOURCE
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return 0;
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#else
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this_is_an_error;
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#endif
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]]
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)],
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AC_LINK_IFELSE([
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AC_LANG_SOURCE([[
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#define _FORTIFY_SOURCE 2
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#include <string.h>
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int main() {
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char *s = " ";
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strcpy(s, "x");
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return strlen(s)-1;
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}
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]]
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)],
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[
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AC_MSG_RESULT([yes])
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CFLAGS=$ac_save_cflags
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CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
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], [
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AC_MSG_RESULT([no])
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CFLAGS=$ac_save_cflags
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],
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),
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[
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AC_MSG_RESULT([no])
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CFLAGS=$ac_save_cflags
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])
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])
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