Re: gnulib:test-stdalign failing on powerpc-darwin8, gcc-4.0

[David Fang]

Hi Paul,

> On 12/15/2014 04:47 PM, David Fang wrote:
> _alignas and _Alignas are broken on your platform, even with gnulib trying to 
> work around the breakage.
>
> >  Is there a problem in the compiler, or rather some incorrect assumption
> >  about the ABI in the test itself?  This is the system compiler, after all.
>
> Most likely the compiler is broken.  Some older GCCs do have a bug here. 
> Gnulib knows about the breakage and attempts to work around it, but 
> apparently this is not working for you, and you need to figure out why.
>
> Does config.log report stdalign.h as working?  If so, that's a bug in the 
> Gnulib test in m4/stdalign.m4: it should detect the bug in your system.  If 
> not, you need to investigate why the Gnulib workaround does not in fact work 
> around your compiler bug.

In my build area for gnuTLS, the config.log reports:

configure:22801: checking for working stdalign.h
configure:22839: gcc -c -g -O2 -I/sw/include conftest.c >&5
conftest.c:191:22: error: stdalign.h: No such file or directory

since the compiler pre-dates C11.
Does this mean that it falls back to the distributed copy in 
gl/stdalign.h?  That file matches the current stdalign.h in gnulib's 
git-master, except for comments at the top.

I don't see any evidence of the replacement stdalign.h being tested in 
config.log.

Fang

--
David Fang
http://www.csl.cornell.edu/~fang/