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Alec Theriault authored
Summary: We use 'gcc -B<base-location> --print-file-name mylib.a' as a way of checking if 'gcc' can discover 'mylib.a' at the given location. However, this can break down if there is a folder caller 'mylib.a' that 'gcc' can discover. We can guard against this by explicitly checking that the path returned by 'gcc' is a file. This may seem like a far-fetched scenario, but since 3d17f1f1, we look for libraries without any prefix or suffix (ie. 'extra-libraries: softfloat', we look for just 'softfloat' as well as 'softloat.a', 'softfloat.dll.a', etc.) which means that there might actusally be a folder of that name in one of the base locations. Reviewers: Phyx, bgamari, hvr, angerman Reviewed By: Phyx, angerman Subscribers: angerman, rwbarton, carter GHC Trac Issues: #16063 Differential Revision: https://phabricator.haskell.org/D5462
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