[Bug c/53562] Add -Werror= support for -D_FORTIFY_SOURCE / __builtin___memcpy_chk

["manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53562

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-06-02 10:25:01 UTC ---
Untested patch:

Index: builtins.c
===================================================================
--- builtins.c  (revision 187627)
+++ builtins.c  (working copy)
@@ -12527,8 +12527,8 @@

       if (! integer_all_onesp (size) && tree_int_cst_lt (size, len))
        {
-         warning_at (tree_nonartificial_location (exp),
-                     0, "%Kcall to %D will always overflow destination
buffer",
+         warning_at (tree_nonartificial_location (exp), OPT_Wfortify_source, 
+                      "%Kcall to %D will always overflow destination buffer",
                      exp, get_callee_fndecl (exp));
          return NULL_RTX;
        }
Index: common.opt
===================================================================
--- common.opt  (revision 187627)
+++ common.opt  (working copy)
@@ -539,6 +539,10 @@
 Common Var(flag_fatal_errors)
 Exit on the first error occurred

+Wfortify-source
+Common Var(warn_fortify_source) Init(1) Warning
+Warnings produced by FORTIFY_SOURCE
+
 Wframe-larger-than=


You will also need to add something to doc/invoke.texi, Changelog,
bootstrap+test and submit to gcc-patches.