[Mingw-msys] [mingw - MSYS] RE: odd compilation error

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By: keithmarshall

So, doesn't the error message give you a clue?

Your Makefile is invoking windres with a -mthreads option, which doesn't appear
in the list of allowed options displayed for the command.  Standard POSIX parsing
considers options introduced by a single hyphen as a concatenation of single
character flags -- hence, when it sees -mthreads, it first tries to set -m,
which is invalid, and gives up.

Also, your sed substitution should be mapping those "-I." flags as "--include-dir=.",
so should say "s/-I/--include-dir=/g" -- what you have will give "--include-dir
.", which *might* work, but is syntactically incorrect.

HTH.

Keith.

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