[Bug fortran/33339] GFORTRAN OPTIMIZATION ERROR ABOVE -O0 FOR MPICH2 TEST F90_RMA/BASEATTRWINF90.F90

["longb at cray dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #4 from longb at cray dot com  2007-09-10 16:03 -------
Subject: Re:  GFORTRAN OPTIMIZATION ERROR ABOVE -O0 FOR
 MPICH2 TEST F90_RMA/BASEATTRWINF90.F90



sgk at troutmask dot apl dot washington dot edu wrote:
> ------- Comment #3 from sgk at troutmask dot apl dot washington dot edu  2007-09-08 19:17 -------
> Subject: Re:  GFORTRAN OPTIMIZATION ERROR ABOVE -O0 FOR MPICH2 TEST
> F90_RMA/BASEATTRWINF90.F90
>
>   
>>>>> ftn -o x -O2 bug2867.f90
>>>>> aprun -n 1 ./x
>>>>>       
>>>>>           
>>>>  Got incorrect value for WIN_SIZE (      140733193389056 , should be
>>>>
>>>> 1024 )
>>>>  Got wrong value for WIN_DISP_UNIT (      140733193388036 , should be
>>>>     
>>>>         
>>> What is ftn?  On my system, when I build MPICH2 I get mpf90.
>>>   
>>>       
>> ftn is a script that allows the user to see a common interface for all 
>> the compilers we  document.  Which compiler is used is controlled by the 
>> module facility. Library sets are selected based on the compiler and OS 
>> combinations.  The same command is used for both serial and parallel 
>> programs.
>>
>>     
>
> Any chance that you can skip the script and use mpif90 directly?
> Also, I have MPICH2 1.05p4.  Can you this version?  Is the 
> version of MPICH2 that you used patched by Cray?
>
>   

I believe we use "plain" mpich2 for the Opteron systems.  Here is the 
detail on the ftn command:

nid00007/longb> ftn -v
/opt/xt-pe/2.1/bin/snos64/ftn: INFO: linux target is being used
mpif90 for 1.0.2
Driving: /opt/gcc/4.2.1/bin/../snos/bin/gfortran -static -v 
-I/opt/xt-mpt/2.1/mpich2-64/GP/include 
-I/opt/xt-mpt/2.1/mpich2-64/GP/include 
-L/opt/xt-mpt/2.1/mpich2-64/GP/lib 
-I/opt/xt-libsci/10.1.0/gnu/snos64/include 
-I/opt/xt-libsci/10.1.0/gnu/snos64/incl
Using built-in specs.
Target: x86_64-suse-linux
Configured with: ../xt-gcc-4.2.1/configure --prefix=/opt/gcc/4.2.1/snos 
--disable-nls --libdir=/opt/gcc/4.2.1/snos/lib 
--enable-languages=c,c++,fortran 
--with-gxx-include-dir=/opt/gcc/4.2.1/snos/include/g++ 
--with-slibdir=/opt/gcc/4.2.1/snos/lib --with-sy
Thread model: posix
gcc version 4.2.1 20070719 (rpm:3)
 /opt/gcc/4.2.1/snos/libexec/gcc/x86_64-suse-linux/4.2.1/collect2 -m 
elf_x86_64 -static /usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o 
/opt/gcc/4.2.1/snos/lib/gcc/x86_64-suse-linux/4.2.1/crtbeginT.o 
-L/opt/xt-mpt/2.1/mpich2-64/GP/lib -L/opt/xt-libsci/1
/opt/gcc/4.2.1/snos/lib/gcc/x86_64-suse-linux/4.2.1/libgfortranbegin.a(fmain.o)(.text+0xa): 
In function `main':
../../../xt-gcc-4.2.1/libgfortran/fmain.c:18: undefined reference to 
`MAIN__'
collect2: ld returned 1 exit status


Note: The version of gcc we are using is not the same as the one you 
noted, and for the XT systems all linking is static.

Our version of mpich2 appears to be older.  I can ask the MPI group for 
a newer version.

Cheers,
Bill


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33339