https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55965
--- Comment #3 from Jeremy Huddleston Sequoia <jeremyhu at macports dot org> --- On OSX, the _isalnum symbol corresponds to the isalnum() function and the __isalnum symbol would correspond to the _isalnum() function. It is emitting the _isalnum symbol (for isalnum()) but not the __isalnum symbol (because _isalnum() is being inlined). I suspect you seeing an isalnum symbol is because you're on a different platform that does not _-prefix.
