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arm-linux-gnueabi-cpp(1) -Wcomment
The C Preprocessor
    Warn whenever a comment-start sequence /* appears in a /* comment, or whenever a backslash-newline
    appears in a // comment.  (Both forms have the same effect.)


-Wall 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.

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