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-Dname[=def]
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Defines symbol name to the preprocessor.
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-E
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Runs only the preprocessor on the C++ source files and sends the result to
stdout. Includes information about the the source of the preprocessed lines. Does
not compile.
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-H
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Prints the path names of included files.
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-P
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Only preprocesses source; outputs to .i file.
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-Uname
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Deletes initial definition of preprocessor symbol name.
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-xM
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Outputs makefile dependency information.
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-xM1
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Generates dependency information but excludes /usr/include.
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