[Bug 1883855] Re: gfortan does not include system .mod files

[Rostislav]

Same for GNU Fortran (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0.

At least libodc-dev, libeccodes-dev, libpnetcdf-dev, libcoarrays-dev,
libopenmpi-dev, and libmpich-dev put their .mod files to
/usr/lib/x86_64-linux-gnu/fortran/gfortran-mod-15, where gfortran
cannnot find them by default.

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Title:
  gfortan does not include system .mod files

Status in gcc-defaults package in Ubuntu:
  New

Bug description:
  Ubuntu 20.04

  
  gfortran can not find .mod files located in
  /usr/lib/x86_64-linux-gnu/fortran/gfortran-mod-15

  The .mod files from /usr/include work perfectly well.

  I have  found two workarounds:
  - To explicitly specify -I flag with that directory
  or
  - to symlink needed .mod files to /usr/include

  $ dpkg -l |grep gfortran
  ii  gfortran                                4:9.3.0-1ubuntu2                    amd64        GNU Fortran 95 compiler
  ii  gfortran-9                              9.3.0-10ubuntu2                     amd64        GNU Fortran compiler
  ii  libgfortran-9-dev:amd64                 9.3.0-10ubuntu2                     amd64        Runtime library for GNU Fortran applications (development files)
  ii  libgfortran5:amd64                      10-20200411-0ubuntu1                amd64        Runtime library for GNU Fortran applications


  It would be great to somehow instruct gfortran to search for
  .mod files in /usr/lib/x86_64-linux-gnu/fortran/gfortran-mod-15 as well...

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