meson/docs/markdown/snippets/link_language.md

New target keyword argument: link_language

There may be situations for which the user wishes to manually specify the linking language. For example, a C++ target may link C, Fortran, etc. and perhaps the automatic detection in Meson does not pick the desired compiler. The user can manually choose the linker by language per-target like this example of a target where one wishes to link with the Fortran compiler:

executable(..., link_language : 'fortran')

A specific case this option fixes is where for example the main program is Fortran that calls C and/or C++ code. The automatic language detection of Meson prioritizes C/C++, and so an compile-time error results like undefined reference to main, because the linker is C or C++ instead of Fortran, which is fixed by this per-target override.