R 4.1.3 is now installed with gfortran 12, which it doesn't work with

[jonathon-love]

To Reproduce

log here https://github.com/jonathon-love/r-package-snapshot/actions/runs/4805568169/jobs/8552111730

i'm using:

    - name: Set up R
      uses: r-lib/actions/setup-r@v2
      with:
        r-version: '4.1.3'

this used to install gfortran 8.2, but now it installs 12, which leads to:

clang -mmacosx-version-min=10.13 -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/Library/Frameworks/R.framework/Resources/lib -L/usr/local/lib -o flashClust.so hc.o hcass2.o -L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin18/8.2.0 -L/usr/local/gfortran/lib -lgfortran -lquadmath -lm -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework -Wl,CoreFoundation
ld: warning: directory not found for option '-L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin18/8.2.0'
ld: warning: directory not found for option '-L/usr/local/gfortran/lib'
ld: library not found for -lgfortran

i think it's because R 4.1.3 was built against gfortran 8.2 ... and now setup-r has moved to gfortran 12 (for these older versions of R), it no longer works.

with thanks

[gaborcsardi]

Thanks for the report! I did try it with R 3.6.x, but that does not hardcode the paths into the R config, like R 4.1.x does. Just fixed this in v2, so if you re-run it, it should work.

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