bomtrace3 handle gcc -MMD option with -MD instead #71
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Signed-off-by: Yongkui Han <yonhan@cisco.com>
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When existing gcc cmd has -MMD option, then the dependency file does not contain system headers.
This is not desired for OmniBOR ADG, which prefers -MD option.
Our solution is to run a child process with the -MD option instead, also we just need to use -E option to get the dependency file.
Also created a few generate_depfile modes for user to configure the behavior of generating dependency file.
Also miscellaneous changes for gcc handling.