PR middle-end/26264: Extraneous warning with __builtin_stdarg_start

[Manuel López-Ibáñez]

Updated version of: http://gcc.gnu.org/ml/gcc-patches/2007-11/msg00106.html

Boostrapped and regression tested on x86_64-unknown-linux-gnu.

OK for 4.4?

2007-11-03  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

  PR 26264
  * c.opt: Enable Wdeprecated for C and ObjC.
  * builtins.c (expand_builtin): Warn for __builtin_stdarg_start being
deprecated.
  * gimplify.c (gimplify_call_expr): Handle __builtin_stdarg_start.

testsuite/
  * 20021023-1.c: Add -Wno-deprecated.
  * pr17301-1.c: Likewise.
  * pr17301-2.c: Likewise.
  * pr26264: New.
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