From: Johannes Sixt <j6t@kdbg.org>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org
Subject: Re: [PATCH/RFC 0/3] compiling git with gcc -O3 -Wuninitialized
Date: Sat, 15 Dec 2012 11:49:25 +0100 [thread overview]
Message-ID: <50CC55B5.8000205@kdbg.org> (raw)
In-Reply-To: <20121214220903.GA18418@sigill.intra.peff.net>
Am 14.12.2012 23:09, schrieb Jeff King:
> Can anybody think of a clever way to expose the constant return value of
> error() to the compiler? We could do it with a macro, but that is also
> out for error(), as we do not assume the compiler has variadic macros. I
> guess we could hide it behind "#ifdef __GNUC__", since it is after all
> only there to give gcc's analyzer more information. But I'm not sure
> there is a way to make a macro that is syntactically identical. I.e.,
> you cannot just replace "error(...)" in "return error(...);" with a
> function call plus a value for the return statement. You'd need
> something more like:
>
> #define RETURN_ERROR(fmt, ...) \
> do { \
> error(fmt, __VA_ARGS__); \
> return -1; \
> } while(0) \
>
> which is awfully ugly.
Does
#define error(fmt, ...) (error_impl(fmt, __VA_ARGS__), -1)
cause problems when not used in a return statement?
-- Hannes
next prev parent reply other threads:[~2012-12-15 10:49 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-14 22:09 [PATCH/RFC 0/3] compiling git with gcc -O3 -Wuninitialized Jeff King
2012-12-14 22:11 ` [PATCH 1/3] remote-testsvn: fix unitialized variable Jeff King
2012-12-15 10:29 ` Florian Achleitner
2012-12-14 22:12 ` [PATCH/RFC 2/3] inline error functions with constant returns Jeff King
2012-12-14 22:13 ` [PATCH/RFC 3/3] silence some -Wuninitialized warnings around errors Jeff King
2012-12-15 3:07 ` [PATCH/RFC 0/3] compiling git with gcc -O3 -Wuninitialized Nguyen Thai Ngoc Duy
2012-12-15 10:09 ` Jeff King
2012-12-15 10:49 ` Johannes Sixt [this message]
2012-12-15 11:09 ` Jeff King
2012-12-15 17:36 ` [PATCH/RFCv2 0/2] " Jeff King
2012-12-15 17:37 ` [PATCH 1/2] make error()'s constant return value more visible Jeff King
2012-12-15 17:42 ` [PATCH 2/2] silence some -Wuninitialized false positives Jeff King
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