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Re: Consistency of function attributes between prototype and definition
- From: Segher Boessenkool <segher at kernel dot crashing dot org>
- To: Florian Weimer <fweimer at redhat dot com>
- Cc: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
- Date: Fri, 2 Oct 2015 14:37:01 -0500
- Subject: Re: Consistency of function attributes between prototype and definition
- Authentication-results: sourceware.org; auth=none
- References: <560E69AB dot 60800 at redhat dot com>
On Fri, Oct 02, 2015 at 01:25:31PM +0200, Florian Weimer wrote:
> glibc has a preprocessor macro called internal_function which switches
> to a different calling convention on certain targets (i386 uses stdcall
> and regparams). For non-K&R function definitions, the compiler enforces
> that both the prototype declaration and the definition match.
>
> When someone writes a patch on a different architecture than i386 and
> forgets to specify internal_function on both prototype and definition,
> the build will pass, even though i386 will not compile.
>
> Is there a way to use a certain harmless attribute to detect this
> mismatch even on architectures where internal_function has no effect?
Maybe aligned(1) will do what you want?
Segher