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arm-linux-gnueabi-cpp(1) -Wall
The C Preprocessor
    Turns on all optional warnings which are desirable for normal code.  At present this is -Wcomment,
    -Wtrigraphs, -Wmultichar and a warning about integer promotion causing a change of sign in "#if"
    expressions.  Note that many of the preprocessor's warnings are on by default and have no options to
    control them.


-Wtrigraphs Most trigraphs in comments cannot affect the meaning of the program. However, a trigraph that would form an escaped newline (??/ at the end of a line) can, by changing where the comment begins or ends. Therefore, only trigraphs that would form escaped newlines produce warnings inside a comment. This option is implied by -Wall. If -Wall is not given, this option is still enabled unless trigraphs are enabled. To get trigraph conversion without warnings, but get the other -Wall warnings, use -trigraphs -Wall -Wno-trigraphs.

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