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53 lines
1.7 KiB
53 lines
1.7 KiB
# =========================================================================== |
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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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