[Developers] Detection of gfortran

[Ian Hinder]

Jian Tao wrote:
> Forgot to link -lgfortran ?

So am I supposed modify my LDFLAGS variable?  Shouldn't this be
autodetected?

> 
> Regards,
> Jian
> 
> Ian Hinder wrote:
>> Hi,
>>
>> I am trying to use Cactus (latest development version) on my laptop with
>> gcc and gfortran.  The laptop is running Ubuntu 7.10.  In my config file
>> I have
>>
>> F90=gfortran
>> F77=gfortran
>> HDF5=yes
>> MPI=MPICH
>> OPTIMISE=no
>>
>> The compilation stage fails with missing symbols, for example
>>
>> /home/ian/work/Cactus/configs/wavetoy/lib/libthorn_IDScalarWaveMoL.a(initialdata.F77.o):
>> In function `idscalarwavemol_initialda
>> ta_':
>> initialdata.f:(.text+0xd05): undefined reference to `_gfortran_pow_r8_i4'
>> i
>>
>> So it looks like for some reason there is a gfortran library which is
>> not being picked up.  In the
>>
>>   Cactus/lib/make/known-architectures/linux
>>
>> file, I notice the line
>>
>>     elif test "`$F90 -dumpversion 2>&1 | grep 'GNU Fortran 95'`" ; then
>>
>> to detect the fortran compiler.  Running
>>
>>   gfortran -dumpversion
>>
>> I get
>>
>>   GNU Fortran (GCC) 4.2.1 (Ubuntu 4.2.1-5ubuntu4)
>>
>> so it is not reporting itself as "GNU Fortran 95".  Should it be?  If I
>> modify the detection script to search for "GNU Fortran" instead,
>> reconfigure and relink, everything works.  So I have two questions:
>>
>> (1) Should the known architectures file be modified to search just for
>> "GNU Fortran"?
>>
>> (2) Why was there no error message that the compiler was not recognized
>> correctly?
>>
> 
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-- 
Ian Hinder
hinder at gravity.psu.edu
http://www.gravity.psu.edu/~hinder