Re: /usr/bin/clang: compilation fails on MIPS due to missing _MIPS_SZPTR macro

On Thu, Dec 26, 2013 at 11:35:16AM +1100, Aníbal Monsalve Salazar wrote:
> On Mon, Jun 06, 2011 at 08:36:26PM +0200, Aurelien Jarno wrote:
>> clone 601645 -1
>> reopen -1
>> reassign -1 clang 2.9-1
>> thanks
>> 
>> Hi,
>> 
>> On Wed, Oct 27, 2010 at 10:32:01PM -0400, Mark Heily wrote:
>>> Package: clang
>>> Version: 2.7-3
>>> Severity: normal
>>> File: /usr/bin/clang
>>> 
>>> clang is unable to compile a trivial program on MIPS due to a glibc
>>> dependency on GCC-specific macros. Here is a command that
>>> demonstrates the failure:
>>> 
>>> $ echo '#include <stdlib.h>' | clang -x c -
>>> clang: warning: unknown platform, assuming -mfloat-abi=soft
>>> In file included from <stdin>:1:
>>> In file included from /usr/include/stdlib.h:320:
>>> In file included from /usr/include/sys/types.h:31:
>>> /usr/include/bits/types.h:128:3: error: #error
>>> 
>>> The problem is that glibc expects the macro _MIPS_SZPTR to be
>>> defined by the compiler. Clang does not appear to define this macro.
>>> Glibc uses _MIPS_SZPTR to set the value of __WORDSIZE, so you can
>>> workaround the compilation issue like this:
>>> 
>>>     printf "#define _MIPS_SZPTR 32\n#include <stdlib.h>\n" | clang -x c -
>>> 
>>> The Linux kernel sources mention several other MIPS-related macros
>>> that are specific to GCC and may not be implemented by other
>>> compilers [1].
>> 
>> This bug has been workaround in eglibc 2.13-5 by using another way to
>> define __WORDSIZE on clang.
>> 
>> That said after discussing with upstream, it clearly appears to be a
>> clang issue. _MIPS_SZPTR has been defined by SGI and must be present
>> in all compilers targeting MIPS. Some more details are given in 
>> "MIPSpro(TM) Compiling and Performance Tuning Guide" (SGI's document 
>> #007-2360-008).
>> 
>> I am therefore cloning and reassigning this bug to clang. I'll keep the
>> workaround in eglibc until the problem is solved on the clang side.
> 
> Hello Aurelien,
> 
> I just closed #599984.
> 
> http://bugs.debian.org/599984
> 
> And #629441 was blocking the fix for #599984.
> 
> http://bugs.debian.org/629441
> 
> I tried your one-line clang command on mips and mipsel.
> 
> The mips result is below.
> 
>   $ uname -a
>   Linux choco 3.10-3-r5k-ip32 #1 Debian 3.10.11-1 (2013-09-10) mips64 GNU/Linux
> 
>   $ echo '#include <stdlib.h>' | clang -x c -
>   /usr/bin/ld: /tmp/--6Ek165.o: warning: linking abicalls files with non-abicalls files
>   /usr/bin/../lib/gcc/mips-linux-gnu/4.8/../../../mips-linux-gnu/crt1.o: In function `__start':
>   (.text+0x18): undefined reference to `main'
>   clang: error: linker command failed with exit code 1 (use -v to see invocation)
> 
> And the mipsel result is below.
> 
>   $ uname -a
>   Linux eladi 2.6.36-trunk-loongson-2f #1 Thu Oct 28 17:32:42 UTC 2010 mips64 GNU/Linux
> 
>   $ echo '#include <stdlib.h>' | clang -x c -
>   /usr/bin/ld: /tmp/--klojkk.o: warning: linking abicalls files with non-abicalls files
>   /usr/bin/../lib/gcc/mipsel-linux-gnu/4.8/../../../mipsel-linux-gnu/crt1.o: In function `__start':
>   (.text+0x18): undefined reference to `main'
>   clang: error: linker command failed with exit code 1 (use -v to see invocation)
> 
> Should I close #629441?
> 
> Regards,
> 
> Aníbal

Fixed typo in Cc list.

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