Printing the gcc predefined macros to stdout

Any time you wanted to know the list of gcc used macros and their values. Here is the command details

touch foo.h; gcc -dM -E foo.h

will list all the macros used.

The option

-dM will generate the list of all #defines used by the pre-processor during execution, this also includes pre-defined macros.

-E will stop the compiler after pre-processing stage. Will not enter to the compiling stage. The output will be in the preprocessed form and will be sent to the stdout.

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Yogi

17 years of experience in various layers of software. Primarily experienced in system side software design and development on server management software. Interested in linux development in x86 and arm architecture.