75 lines
2.4 KiB
Plaintext
75 lines
2.4 KiB
Plaintext
|
# ===========================================================================
|
||
|
|
# https://www.gnu.org/software/autoconf-archive/ax_add_fortify_source.html
|
||
|
|
# ===========================================================================
|
||
|
|
#
|
||
|
|
# SYNOPSIS
|
||
|
|
#
|
||
|
|
# AX_ADD_FORTIFY_SOURCE
|
||
|
|
#
|
||
|
|
# DESCRIPTION
|
||
|
|
#
|
||
|
|
# Check whether -D_FORTIFY_SOURCE=2 can be added to CPPFLAGS without macro
|
||
|
|
# redefinition warnings or linker errors. Some distributions (such as
|
||
|
|
# Gentoo Linux) enable _FORTIFY_SOURCE globally in their compilers,
|
||
|
|
# leading to unnecessary warnings in the form of
|
||
|
|
#
|
||
|
|
# <command-line>:0:0: error: "_FORTIFY_SOURCE" redefined [-Werror]
|
||
|
|
# <built-in>: note: this is the location of the previous definition
|
||
|
|
#
|
||
|
|
# which is a problem if -Werror is enabled. This macro checks whether
|
||
|
|
# _FORTIFY_SOURCE is already defined, and if not, adds -D_FORTIFY_SOURCE=2
|
||
|
|
# to CPPFLAGS.
|
||
|
|
#
|
||
|
|
# Newer mingw-w64 msys2 package comes with a bug in
|
||
|
|
# headers-git-7.0.0.5546.d200317d-1. It broke -D_FORTIFY_SOURCE
|
||
|
|
# support, and would need -lssp or -fstack-protector. See
|
||
|
|
# https://github.com/msys2/MINGW-packages/issues/5803. Try to
|
||
|
|
# actually link it.
|
||
|
|
#
|
||
|
|
# LICENSE
|
||
|
|
#
|
||
|
|
# Copyright (c) 2017 David Seifert <soap@gentoo.org>
|
||
|
|
# Copyright (c) 2019 Reini Urban <rurban@cpan.org>
|
||
|
|
#
|
||
|
|
# 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 3
|
||
|
|
|
||
|
|
AC_DEFUN([AX_ADD_FORTIFY_SOURCE],[
|
||
|
|
AC_MSG_CHECKING([whether to add -D_FORTIFY_SOURCE=2 to CPPFLAGS])
|
||
|
|
AC_LINK_IFELSE([
|
||
|
|
AC_LANG_PROGRAM([],
|
||
|
|
[[
|
||
|
|
#ifndef _FORTIFY_SOURCE
|
||
|
|
return 0;
|
||
|
|
#else
|
||
|
|
this_is_an_error;
|
||
|
|
#endif
|
||
|
|
]]
|
||
|
|
)],
|
||
|
|
AC_LINK_IFELSE([
|
||
|
|
AC_LANG_SOURCE([[
|
||
|
|
#define _FORTIFY_SOURCE 2
|
||
|
|
#include <string.h>
|
||
|
|
int main() {
|
||
|
|
const char *s = " ";
|
||
|
|
strcpy(s, "x");
|
||
|
|
return strlen(s)-1;
|
||
|
|
}
|
||
|
|
]]
|
||
|
|
)],
|
||
|
|
[
|
||
|
|
AC_MSG_RESULT([yes])
|
||
|
|
CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
|
||
|
|
], [
|
||
|
|
AC_MSG_RESULT([no])
|
||
|
|
],
|
||
|
|
),
|
||
|
|
[
|
||
|
|
AC_MSG_RESULT([no])
|
||
|
|
])
|
||
|
|
])
|