julia

7d64f07b - fixup-libgfortran: Bail out if libgfortran can't be found (#35096)

fixup-libgfortran: Bail out if libgfortran can't be found (#35096) Previously if the library was not found, we would try to look for the directory of an empty file, which ironicall does something almost sensible: ``` $ gfortran -print-file-name= /usr/lib/gcc/x86_64-linux-gnu/9/ ``` Unfortunately, we then `dirname` the directory, stripping the last path component. Often this is harmless, but on some systems, the 32bit path is e.g. `/usr/lib/gcc/x86_64-linux-gnu/9/32/`, which can cause the 64 bit path to be copied instead of the 32 bit path. This is of course only an issue if the appropriate runtime libraries are missing, but an arch mismatch error is harder to debug than a missing libraries error (as well as it being of course incorrect to copy the 64 bit libraries to our build directory). This fixes fixup-libgfortran to no try and look for the directory of an empty libname.