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GHC has code to handle unsuffixed .so files that are linker scripts pointing to the real shared library. The detection is done by parsing the result of `dlerror()` after calling `dlopen()` and looking for certain error strings. On musl libc, the error message is "Exec format error", which happens to be `strerror(ENOEXEC)`: ``` $ cat tmp.c #include <dlfcn.h> #include <stdio.h> int main(void) { dlopen("libz.so", RTLD_NOW | RTLD_GLOBAL); puts(dlerror()); return 0; } $ gcc -o tmp tmp.c $ ./tmp Error loading shared library libz.so: Exec format error $ ``` This change fixes the workaround to also work on musl libc. Link: https://phabricator.haskell.org/D5474
64ce6afa