[Bug tree-optimization/41271] [4.5 Regression] FAIL: gcc.dg/matrix/matrix-2.c scan-ipa-dump-times matrix-reorg "Flattened 2 dimensions" 1

[joseph at codesourcery dot com]

------- Comment #7 from joseph at codesourcery dot com  2009-09-05 11:35 -------
Subject: Re:  [4.5 Regression] FAIL:
 gcc.dg/matrix/matrix-2.c scan-ipa-dump-times matrix-reorg "Flattened 2
 dimensions" 1

On Sat, 5 Sep 2009, rguenth at gcc dot gnu dot org wrote:

> It's glibc prototyping printf as
> 
>  extern int printf (__const char * __restrict __format, ...);
> 
> note the __restrict qualifier on __format.  This doesn't match up exactly with
> our builtin function definition which is
> 
>  extern int printf (__const char * __format, ...);
> 
> No idea why glibc adds __restrict everywhere.

Because in C99 that is the correct prototype for printf (and a lot of 
other standard functions also have restrict qualifiers on pointer 
parameters).

Qualifiers on function parameters are ignored for the purposes of type 
compatibility and composite types (6.7.5.3#15) so it shouldn't matter 
whether the "restrict" is present on the built-in function or not - the 
qualifiers only matter within the function definition, not for callers of 
the function.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41271