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arm-linux-gnueabi-cpp(1) -Wendif-labels
The C Preprocessor
-Wendif-labels
    Warn whenever an #else or an #endif are followed by text.  This usually happens in code of the form

            #if FOO
            ...
            #else FOO
            ...
            #endif FOO

    The second and third "FOO" should be in comments, but often are not in older programs.  This warning
    is on by default.

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