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

From: David Fang
Subject: Re: gnulib:test-stdalign failing on powerpc-darwin8, gcc-4.0
Date: Thu, 18 Dec 2014 13:26:12 -0500 (EST)

Paul and all,


So I finally dug deeper into these compilation issues and with -save-temps, discovered that I had patched the wrong stdalign.in.h. Apparently, GNUTLS-3.3.9 ships two copies of it, and I patched the one that was NOT used by test-stdalign. After applying your patch to both copies in gnutls, test-stdalign passes, as does everything else.
        Thanks for your gnulib patch!


David Fang wrote:
 Hi Paul,
      I tried applying the patch (just the stdalign.in.h bit) to the
 powerpc-darwin8 build, but I still see (when changing the assert to

Can you deduce why the fix didn't work?  It should have inserted this:

 +#elif (defined __APPLE__ && defined __MACH__                  \
 +         ? 4 < __GNUC__ + (1 <= __GNUC_MINOR__)                 \
 +         : __GNUC__)

and that should be false on your platform because __APPLE__ and __MACH__ should be defined, __GNUC__ should be 4, and __GNUC_MINOR__ should be zero. Why is it true? What are the values of __APPLE__, etc.? That is, what is the output of running 'gcc -E foo.c | tail' when foo.c contains the following?

#include <stdio.h>
"__GNUC__" __GNUC__
"__APPLE__" __APPLE__
"__MACH__" __MACH__

David Fang

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