common: Handle empty lib_paths
gracefully
#286
Merged
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env::split_paths()
called with an empty string, yields one empty string. This behavior is not really compatible with the forloop it's used in, which in such case is going to produce-L
not followed by any path. This causes rustc to fail.To prevent this issue, enter the loop only when
lib_paths
is not empty.That issue was reproducable on MacOS, where
lib_paths
often ends up being empty.