53 lines
1.7 KiB
Text
53 lines
1.7 KiB
Text
# ===========================================================================
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# Modified from 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 CFLAGS without macro
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# redefinition warnings. Some distributions (such as Gentoo Linux) enable
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# _FORTIFY_SOURCE globally in their compilers, leading to unnecessary
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# 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 CFLAGS.
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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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#
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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 1
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AC_DEFUN([AX_ADD_FORTIFY_SOURCE],[
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AC_MSG_CHECKING([whether to add -D_FORTIFY_SOURCE=2 to CFLAGS])
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AC_LINK_IFELSE([
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AC_LANG_SOURCE(
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[[
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int main() {
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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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)], [
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AC_MSG_RESULT([yes])
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CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
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], [
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AC_MSG_RESULT([no])
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])
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])
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