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Subject: Re: [OMPI devel] dummy component warnings
From: Paul H. Hargrove (PHHargrove_at_[hidden])
Date: 2011-01-25 17:19:52


I have gcc-4.0.0 on Linux built from unmodified FSF sources.
I will try to reproduce.

-Paul

On 1/25/2011 1:47 PM, Nathan Hjelm wrote:
> Looks like a bug in Apple's gcc 4.0. I tried the source with gcc 3.4.6
> and gcc 4.1.2 on Linux and did not see that error.
>
> I will take a look and see if there is a simple fix to get around this
> apparent compiler bug.
>
> -Nathan
>
> On Tue, 25 Jan 2011, Jeff Squyres wrote:
>
>> Short version
>> =============
>>
>> MTT turned up a problem with -std=gnu99 on OS X Leopard, which ships
>> with the gcc 4.0 compiler (OS X Snow Leopard ships with gcc 4.2, and
>> doesn't have a problem). Does anyone have gcc 4.0 on Linux? I'm
>> wondering if the same problem would occur.
>>
>> More details:
>> =============
>>
>>> From our friends at Absoft:
>>
>> -----
>> The -std=gnu99 is causing the problem when used with gcc-4.0 ( the
>> default on Leopard with Apple's XCode 3.1 development tools ):
>>
>> BigMac:ompi cag$ gcc --version -std=gnu99 -c conftest.s
>> conftest.s:2:3: error: invalid preprocessing directive #_gsym_test_func
>> conftest.s:5:3: error: invalid preprocessing directive #_gsym_test_func
>> BigMac:ompi cag$ gcc-4.0 -std=gnu99 -c conftest.s
>> conftest.s:2:3: error: invalid preprocessing directive #_gsym_test_func
>> conftest.s:5:3: error: invalid preprocessing directive #_gsym_test_func
>> BigMac:ompi cag$ gcc-4.2 -std=gnu99 -c conftest.s
>> BigMac:ompi cag$
>>
>> On Snow Leopard with Apple's XCode 3.2 development tools, the default
>> compiler is 4.2.
>> -----
>>
>> The compile line he's talking about in particular is from a configure
>> test in opal/config/opal_config_asm.m4, where we're looking for
>> assembly global symbols. The source that we're trying to compile is:
>>
>> -----
>> .text
>> # _gsym_test_func
>> .globl _gsym_test_func
>> _gsym_test_func:
>> # _gsym_test_func
>> -----
>>
>> (configure tries a few prefixes)
>>
>> But the "#" token with the -std=gnu99 option is causing failures
>> where it shouldn't (i.e., it causes configure to abort because all
>> the assembly tests looking for the global symbols error out due to
>> the # token.
>>
>> So I think we either need to find a workaround for this assembly test
>> or whack the idea of the C99 stuff. :-(
>>
>>
>>
>> On Jan 24, 2011, at 10:29 AM, Nathan Hjelm wrote:
>>
>>> No, they didn't get added (adding them now). I didn't get a chance
>>> to add them over the weekend.
>>>
>>> -Nathan
>>>
>>> On Mon, 24 Jan 2011, Jeff Squyres wrote:
>>>
>>>> I'm getting these:
>>>>
>>>> CC dummy_component.lo
>>>> dummy_component.c:25: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:28: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:29: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:30: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:31: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:33: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:34: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:35: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:37: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c:39: warning: ISO C90 forbids specifying subobject
>>>> to initialize
>>>> dummy_component.c: In function 'component_open':
>>>> dummy_component.c:45: warning: unused variable 'c'
>>>> dummy.c:67: warning: ISO C90 forbids specifying subobject to
>>>> initialize
>>>> dummy.c:68: warning: ISO C90 forbids specifying subobject to
>>>> initialize
>>>> dummy.c:69: warning: ISO C90 forbids specifying subobject to
>>>> initialize
>>>> dummy.c:70: warning: ISO C90 forbids specifying subobject to
>>>> initialize
>>>> CCLD mca_debugger_dummy.la
>>>>
>>>> Did the autoconf tests not get added?
>>>>
>>>> --
>>>> Jeff Squyres
>>>> jsquyres_at_[hidden]
>>>> For corporate legal information go to:
>>>> http://www.cisco.com/web/about/doing_business/legal/cri/
>>>>
>>>>
>>>> _______________________________________________
>>>> devel mailing list
>>>> devel_at_[hidden]
>>>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>>> _______________________________________________
>>> devel mailing list
>>> devel_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>>
>>
>> --
>> Jeff Squyres
>> jsquyres_at_[hidden]
>> For corporate legal information go to:
>> http://www.cisco.com/web/about/doing_business/legal/cri/
>>
>>
>> _______________________________________________
>> devel mailing list
>> devel_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>>
>
> _______________________________________________
> devel mailing list
> devel_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/devel

-- 
Paul H. Hargrove                          PHHargrove_at_[hidden]
Future Technologies Group
HPC Research Department                   Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900