ax_add_fortify_source
=====================

Synopsis
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     AX_ADD_FORTIFY_SOURCE

Description
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Check whether -D_FORTIFY_SOURCE=2 can be added to CPPFLAGS without macro redefinition warnings. 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.

Source Code
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Download the latest version of ax_add_fortify_source.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_add_fortify_source.m4) or browse the macro's revision history (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_add_fortify_source.m4).

License
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Copyright © 2017 David Seifert soap@gentoo.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.