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Date: Fri, 28 Mar 2014 15:05:00 -0000
From: James Greenhalgh <james.greenhalgh@arm.com>
To: Anthony Green <green@moxielogic.com>
Cc: "libffi-discuss@sourceware.org" <libffi-discuss@sourceware.org>
Subject: Re: libffi 3.1-rc1 needs testing!
Message-ID: <20140328150533.GA31475@arm.com>
References: <87eh2liiow.fsf@moxielogic.com> <87a9ce3ry7.fsf@moxielogic.com>
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Hi,

I'm seeing issues with libffi.call/float2.c on GCC 4.9 toolchains across
ARM, AArch64, x86_64. I guess GCC 4.9 is more aggressive in warning for
unused values:

FAIL: libffi.call/float2.c -W -Wall -O0 (test for excess errors)
FAIL: libffi.call/float2.c -W -Wall -O2 (test for excess errors)
FAIL: libffi.call/float2.c -W -Wall -O3 (test for excess errors)
FAIL: libffi.call/float2.c -W -Wall -Os (test for excess errors)
FAIL: libffi.call/float2.c -W -Wall -O2 -fomit-frame-pointer (test for excess errors)

In file included from ../../testsuite/libffi.call/float2.c:10:0:
../../testsuite/libffi.call/float2.c: In function 'main':
../../testsuite/libffi.call/ffitest.h:18:39: warning: right-hand operand of comma expression has no effect [-Wunused-value]
 #define CHECK(x) (!(x) ? (abort(), 1) : 0)
                                       ^
../../testsuite/libffi.call/float2.c:55:5: note: in expansion of macro 'CHECK'
     CHECK(0);
     ^
output is:
In file included from ../../testsuite/libffi.call/float2.c:10:0:
../../testsuite/libffi.call/float2.c: In function 'main':
../../testsuite/libffi.call/ffitest.h:18:39: warning: right-hand operand of comma expression has no effect [-Wunused-value]
 #define CHECK(x) (!(x) ? (abort(), 1) : 0)
                                       ^
../../testsuite/libffi.call/float2.c:55:5: note: in expansion of macro 'CHECK'
     CHECK(0);
     ^

Thanks,
James