Satish,
Well the classic model that Matt inherited from GNU that does not include
the appropriate include files but instead makes up some prototype in the test
file and looks for symbols in the resulting .o is not IMHO good anyways and I'd
like to see it eventually totally eliminated so here is one place it can be
done. Use the checklink() function that takes an include and a main body to
check these math functions? If you have the main() return depend on the result
of the math function then it cannot simply remove the entire call.
Barry
> On Sep 3, 2015, at 7:33 PM, Satish Balay <ba...@mcs.anl.gov> wrote:
>
> Ok - the issue here is:- '-O3 -ffast-math' inlines/optimzies out the
> math code in configure test [so -lm isn't needed/required here]. But
> the code in metis [and petsc] library sources isn't inlined out
> [requiring -lm].
>
>>>>>>>>>>>>> Current configure behavior <<<<<<<<<<<
> $ cat conftest.c
> double pow(double, double);
> static void _check_pow() { double x = 0,y ; y = pow(x, x);
> ; }
> int main() {
> _check_pow();;
> return 0;
> }
> $ gcc -O -ffast-math conftest.c
> $ gcc conftest.c
> /tmp/ccWCYvMy.o: In function `_check_pow':
> conftest.c:(.text+0x28): undefined reference to `pow'
> collect2: error: ld returned 1 exit status
> $ gcc conftest.c -lm
> $
>>>>>>>>>>>>> modified testcode to reproduce library-code behavior <<<<<<<<<<<
> $ cat newtest.c
> #include <math.h>
> //double pow(double, double); //also works but gives different error
> double _check_pow(double x ) { return pow(x, x);
> ; }
> int main() {
> _check_pow(1.0);;
> return 0;
> }
> $ gcc -O3 -ffast-math newtest.c
> /tmp/ccfeotgx.o: In function `_check_pow':
> newtest.c:(.text+0x5): undefined reference to `__pow_finite'
> collect2: error: ld returned 1 exit status
> $ gcc -O3 -ffast-math newtest.c -lm
> $
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>
> This test code within configure is spun by code-generator- so I'm not
> sure how to modify it to get this test working..
>
> [and its not clear if this change works universally - a different
> compiler/optimizer might not fail the same way?]
>
> Satish
>
> On Thu, 3 Sep 2015, Michele Rosso wrote:
>
>> Hi Satish,
>>
>> I did as you suggested and I was able to install successfully.
>> I attached the configure script and log.
>>
>> Thanks!
>> Michele
>>
>> On Thu, 2015-09-03 at 13:08 -0500, Satish Balay wrote:
>>
>>> Hm - this is weird.
>>>
>>>>>>>>>>>>>>
>>>
>>> TESTING: checkMath from
>>> config.libraries(config/BuildSystem/config/libraries.py:251)
>>> Check for sin() in libm, the math library
>>>
>>> Executing: mpicc -o /tmp/petsc-AXFj8c/config.libraries/conftest -Wall
>>> -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -O3 -ffast-math
>>> -march=native -mtune=native /tmp/petsc-AXFj8c/config.libraries/conftest.o
>>> -L/usr/lib/x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.8
>>> -L/usr/lib/x86_64-linux-gnu -L/lib/x86_64-linux-gnu
>>> -L/usr/lib/x86_64-linux-gnu -ldl -lmpich -lopa -lmpl -lrt -lcr -lpthread
>>> -lgcc_s -ldl
>>> Popping language C
>>> Math functions are linked in by default
>>>
>>>
>>> Executing: mpicc -o /tmp/petsc-AXFj8c/config.libraries/conftest -Wall
>>> -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -O3 -ffast-math
>>> -march=native -mtune=native /tmp/petsc-AXFj8c/config.libraries/conftest.o
>>> -Wl,-rpath,/opt/petsc/petscfork/gnu-opt-32idx/lib
>>> -L/opt/petsc/petscfork/gnu-opt-32idx/lib -lmetis
>>> -L/usr/lib/x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.8
>>> -L/usr/lib/x86_64-linux-gnu -L/lib/x86_64-linux-gnu
>>> -L/usr/lib/x86_64-linux-gnu -ldl -lmpich -lopa -lmpl -lrt -lcr -lpthread
>>> -lgcc_s -ldl
>>> Possible ERROR while running linker: exit code 256
>>> stderr:
>>> /opt/petsc/petscfork/gnu-opt-32idx/lib/libmetis.a(kmetis.c.o): In function
>>> `libmetis__InitKWayPartitioning':
>>> /opt/petsc/petscfork/gnu-opt-32idx/externalpackages/metis-5.1.0-p1/libmetis/kmetis.c:187:
>>> undefined reference to `__log_finite'
>>> /opt/petsc/petscfork/gnu-opt-32idx/externalpackages/metis-5.1.0-p1/libmetis/kmetis.c:187:
>>> undefined reference to `__pow_finite'
>>> /opt/petsc/petscfork/gnu-opt-32idx/lib/libmetis.a(util.c.o): In function
>>> `gk_flog2':
>>> /opt/petsc/petscfork/gnu-opt-32idx/externalpackages/metis-5.1.0-p1/GKlib/util.c:106:
>>> undefined reference to `__log_finite'
>>> <<<<<<<<<<
>>>
>>> Can you rerun configure with the additional option "LIBS=-lm" - and see if
>>> it makes a difference?
>>>
>>> Satish
>>>
>>>
>>> On Thu, 3 Sep 2015, Michele Rosso wrote:
>>>
>>>> Hi,
>>>>
>>>> I am trying to install METIS via the development version of petsc, but I
>>>> encountered the following error:
>>>>
>>>> UNABLE to CONFIGURE with GIVEN OPTIONS (see configure.log
>>>> for details):
>>>> -------------------------------------------------------------------------------
>>>> Downloaded metis could not be used. Please check install
>>>> in /opt/petsc/petscfork/gnu-opt-32idx
>>>>
>>>>
>>>> I attached the install script and the configure.log file.
>>>> Any idea?
>>>>
>>>> Thanks,
>>>> Michele
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>
