[ET Trac] [Einstein Toolkit] #1847: FFTW3 fortran interface not working for system installation

[Einstein Toolkit]

#1847: FFTW3 fortran interface not working for system installation
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 Reporter:  knarf     |       Owner:                     
     Type:  defect    |      Status:  new                
 Priority:  optional  |   Milestone:                     
Component:  Cactus    |     Version:  development version
 Keywords:            |  
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 The FFTW3 thorn is able to detect system installations, but does not add
 (for example) /usr/include as include path since it is a standard system
 include path (for C), and could collide with other libraries. This is
 correct.

 However, some system fftw3 libraries install the fftw3.f Fortran file also
 in /usr/include, and expect this to be in the include path for the Fortran
 compiler. This, however, is not the case for all compilers (since
 /usr/include is meant for C headers, not Fortran), i.e., for gfortran.
 This could be seen as bug in the fftw3 installation, but we should provide
 a workaround. Right now, the FFTW3 thorn does not always provide a working
 interface for Fortran.

 Other libraries have similar problems, so I wonder if we could provide a
 common workaround. We have to add these directories as -I flag to the
 Fortran compiler, but we must not add it to the C or C++ compilers. I
 don't see a good way to currently do this within Cactus. Am I right? If
 so: would it make sense to have Cactus look for a variable, i.e.,
 FFTW3_FINC_DIRS, and to only add those for Fortran compilations?

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1847>
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