gfortan does not include system .mod files

[Rostislav]

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...

[Rostislav (rostislav-kouznetsov)]

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.

[Kabir Medina (kabirmedina)]

Yes! I have Ubuntu 22.04.3 LTS, and I am facing the same issue.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.