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Subject: Re: [Qemu-devel] [PATCH] libvixl: Add gcc format attribute
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To: Stefan Weil <sw@weilnetz.de>, Richard Henderson <rth@twiddle.net>, qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>

Il 18/06/2014 06:45, Stefan Weil ha scritto:
> A 32 bit build on Ubuntu gcc-4.6.3-1ubuntu5 just finished and shows the
> same error messages, so really all of my builds show them (32 and 64
> bit, Linux native and cross for Windows).
>
> Peter, I know that libvixl is external code, but posted this patch
> because I need help: I simply don't know why the compiler complains and
> whether these errors are really errors. It's easy to "fix" them by using
> PRId64, but would that be correct?
>
> Variable arguments usually are not converted to 64 bit values: if they
> are smaller than int, they are expanded to int, and larger values are
> passed as they are. But here obviously the compiler expands uint32_t to
> int64_t. Why?

You can try synthesizing a minimal test case (either manually, or using 
the "delta" tool).  Then compile it with -fdump-tree-all and see what it 
shows.

Paolo