pkg-config module points to wrong path

[fiolj]

Description

Hi, after installing stdlib I've found a couple of inconsistencies (bugs?) with pkg-config that result in stdlib not working with my programs using Make when following the instructions

1. The file fortran_stdlib.pc is installed in:
   $(install_dir)/lib64/pkgconfig
   instead of
   $(install_dir)/lib/pkgconfig
   as stated in the README.md

2. In the contents of fortran_stdlib.pc reads:
   moduledir=${prefix}/include/fortran_stdlib/GNU-15.2.1
   but in order to make it work I had to modify it to read:
   moduledir=${prefix}/include/fortran_stdlib/GNU-15.2.1/fortran_stdlib

I don't know the workings of cmake to see if efectively is a bug, and how to correct it.

Expected Behaviour

The installation working with the instructions in README.md

Version of stdlib

f0ad91d

Platform and Architecture

Fedora 43

Additional Information

No response

[jvdp1]

@fiolj I tried to repeat your issue on my Ubuntu 24.04 computer, but without success:

1. It is correctly installed in $(install_dir)/lib/pkgconfig
2. It is correctly installed in $(install_dir)/include/fortran_stdlib/GNU-13.3.0

So, I wonder if your issue is due to Fedora (newer GNU libraries) or a newer CMake (what version do you use?)?

[jvdp1]

Actually, it is aslo probably partly related with the modularization of stdlib, started with #1033

\cc @eduardz1 @perazz @jalvesz @awvwgk

[fiolj]

@fiolj I tried to repeat your issue on my Ubuntu 24.04 computer, but without success:

1. It is correctly installed in `$(install_dir)/lib/pkgconfig`

2. It is correctly installed in `$(install_dir)/include/fortran_stdlib/GNU-13.3.0`

So, I wonder if your issue is due to Fedora (newer GNU libraries) or a newer CMake (what version do you use?)?

Thanks @jvdp1 for checking. I am using:

• cmake version 3.31.10
• GNU Fortran (GCC) 15.2.1 20251211 (Red Hat 15.2.1-5)
• Fedora 43
• pkg-config 2.3.0

[jvdp1]

@fiolj Thank you.

The issue 2. should be fixed with this commit: f3d012b in my branch modular.
Could you test your setup with this branch in my repo, please?

This is related to #1081

[fiolj]

The issue 2. should be fixed with this commit: f3d012b in my branch modular.
Could you test your setup with this branch in my repo, please?

Yes @jvdp1, issue 2 is solved in your branch. Now library is correctly installed in $(install_dir)/include/fortran_stdlib/GNU-13.3.0

[jvdp1]

Thank you @fiolj for the confirmation.

RE: 1., it seems that lib64 is a GNU convention for the latest Fedora. I guess that the best approach is to modify the README.md to provide a warning that $(install_dir)/lib/pkgconfig could be $(install_dir)/lib64/pkgconfig on some OS. Do you agree?
`

[fiolj]

Yes, some searching shows that debian and debian derived use /lib but other OS use /lib and /lib64.
I agree that it could be useful modify the README.md.
Thanks for the work and the explanation!
Should we close the issue or wait to merge the solution?

[jvdp1]

Yes, some searching shows that debian and debian derived use /lib but other OS use /lib and /lib64. I agree that it could be useful modify the README.md. Thanks for the work and the explanation!

No problem! I learnt a few things too!

Should we close the issue or wait to merge the solution?

Could you maybe open a PR to update the README and add a rule to close this issue automatically when the PR will be merged? Thank you.

[fiolj]

Could you maybe open a PR to update the README
Done

add a rule to close this issue automatically when the PR will be merged?

I've learnt how to do it automatically after I've created the PR, and have no permission to do it manually.

Also, may be should be closed when merged a PR with the solution you provided that fixes issue 2. on your commit
(f3d012b)