dnl

dnl Check for support for D_FORTIFY_SOURCE=2

dnl

AC_DEFUN([AC_CC_D_FORTIFY_SOURCE],[

AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS])

if test $enable_hardening = yes; then

case "$host" in

*)

gl_COMPILER_OPTION_IF([-O2 -D_FORTIFY_SOURCE=2], [

CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"

],

[],

[AC_LANG_PROGRAM([[

#include <pthread.h>

__thread unsigned int t_id;

]], [[t_id = 1;]])]

)

esac

fi

])