[Developers] Detection of gfortran

[Jian Tao]

As a user, I link gfortran myself, but it should be 
auto-detected. I will take a look.

Regards,
Jian

Ian Hinder wrote:
> 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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