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arm-linux-gnueabi-cpp(1) -P
The C Preprocessor
-P  Inhibit generation of linemarkers in the output from the preprocessor.  This might be useful when
    running the preprocessor on something that is not C code, and will be sent to a program which might
    be confused by the linemarkers.

Related

cpp [-Dmacro[=defn]...] [-Umacro] [-Idir...] [-iquotedir...] [-Wwarn...] [-M|-MM] [-MG] [-MF filename] [-MP] [-MQ target...] [-MT target...] [-P] [-fno-working-directory] [-x language] [-std=standard] infile outfile
-fworking-directory Enable generation of linemarkers in the preprocessor output that will let the compiler know the current working directory at the time of preprocessing. When this option is enabled, the preprocessor will emit, after the initial linemarker, a second linemarker with the current working directory followed by two slashes. GCC will use this directory, when it's present in the preprocessed input, as the directory emitted as the current working directory in some debugging information formats. This option is implicitly enabled if debugging information is enabled, but this can be inhibited with the negated form -fno-working-directory. If the -P flag is present in the command line, this option has no effect, since no "#line" directives are emitted whatsoever.

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