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## 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:
```meson
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.
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