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The PathScale compiler silently accepts unknown options that start in more than one '-': $ touch foo.c $ pathcc -c foo.c --junk $ echo $? 0 $ pathcc -c foo.c ---junk $ echo $? 0 $ pathcc -c foo.c -junk pathcc ERROR parsing -junk: unknown flag $ echo $? 2 We teach the TryCompile to pass a bogus flag with only one '-' instead of three '-'s for this compiler.