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Clang warns me,
clang: warning: argument unused during compilation: '-Os'
During compile with make. Why it doesn’t accept the optimization flag?
-Osisn’t a valid optimization option for (most)clang– it’s not completely flag-compatible with GCC.The clang man page is authoritative on what options your particular version accepts (specifically, optimizing by size is not yet a primary concern for LLVM). Apple has pushed back patches for
-Osand-Oz, but most packages don’t include these updates.