[C/C++] PR 13358 long long and C++ do not mix well

["Manuel López-Ibáñez" <lopezibanez at gmail dot com>]

CPP and the FE were using different semantics. invoke.texi said that
Wlong-long was the default. This was not correct. It was the default
for CPP but -Wno-long-long was the default for the FE. Now there is
only one semantic: the one from the FE.

However, we were inhibiting warning even if the user requested it
through Wlong-long. Now explicit Wlong-long (or Wno-long-long)
overrides everything else, except in system headers.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu with
--enable-languages=all,ada with --target_board=\{-m32,-m64\}

OK for trunk?

2008-08-25  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR 13358
	* doc/invoke.texi (-Wlong-long): Update description.
	* c-opts.c (sanitize_cpp_opts): Synchronize cpp's warn_long_long
	and front-end warn_long_long. Wlong-long only depends on other
	flags if it is uninitialized.
	* c-lex (interpret_integer): Only warn if there was no previous
	overflow and -Wlong-long is enabled.
	* c-decl.c (declspecs_add_type): Drop redundant flags.
	* c.opt (Wlong-long): Init to -1.
	* c-parser.c (disable_extension_diagnostics): warn_long_long is
	the same for CPP and FE.
	(restore_extension_diagnostics): Likewise.
cp/
	* parser.c (cp_parser_check_decl_spec): Drop redundant flags.
testsuite/
	* g++.dg/warn/pr13358.C: New.
	* g++.dg/warn/pr13358-2.C: New.
	* g++.dg/warn/pr13358-3.C: New.	
	* gcc.dg/wtr-int-type-1.c: Use two dg-warning to match two
	messages. Test for "long long" in system headers.

Attachment: fix-pr13358-try2.diff
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