Date: Tue, 21 Jun 2011 01:00:52 +0200 From: Koop Mast <kwm@rainbow-runner.nl> To: Matthias Andree <mandree@FreeBSD.org> Cc: ports@FreeBSD.org, ports-committers@FreeBSD.org Subject: Re: gcc-clang issue Message-ID: <4DFFD124.2030902@rainbow-runner.nl> In-Reply-To: <4DFFCA3B.4030307@FreeBSD.org> References: <201106202202.p5KM2ro0040297@repoman.freebsd.org> <4DFFCA3B.4030307@FreeBSD.org>
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On 6/21/2011 0:31 , Matthias Andree wrote:
> I'v commited this half an hour ago:
>
>> mandree 2011-06-20 22:02:53 UTC
>>
>> FreeBSD ports repository
>>
>> Modified files:
>> sysutils/e2fsprogs Makefile
>> Log:
>> [1] USE_GCC=4.2+, to avoid clang. Port needs -lgcc and -lgcc_s
>> explicitly.
>> [...]
>
> [1] is actually (a) a quick excuse and (b) based on the assumption
> that USE_GCC will override a clang default ports compiler.
>
> I HAVE tried clang, and got a particular kind of linker errors, namely
> that unrelated .o files redefine the same unrelated symbols - and a
> crc32.o file redefining libext2fs symbols is curious, to put it mildly.
>
> I currently suspect that there are "inline" handling differences
> between clang and gcc, combined with definitions ("implementations")
> in .h files, and possibly either different linker behaviour with
> clang, or actually different symbols.
>
Hey, could you try this patch? I try the USE_CSTD=gnu89 trick if I get
symbol troubles when linking. This is because clang defaults to gnu99
while gcc still defaults to gnu89. From what I remember the inline
keyword has different meanings between the two, or how you use it
atleast. Someone explained it to my last year but I can't remember all
the gory details about it.
http://people.freebsd.org/~kwm/e2fsprogs-clang.diff
> Has anyone seen similar issues (duplicate symbol errors) after
> switching to clang?
>
> Haven't had time to check things in detail, and thought I'd commit
> USE_GCC right away to unwedge the build for future -exp runs.
>
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