Yes, GCC/G++ can dump its default preprocessor defines using the -dM and -E options together. Here's the command:

gcc -dM -E - < /dev/null

Or for G++:

g++ -dM -E - < /dev/null

This will output all the predefined macros, including ones like GNUC, STDC, and others, to the console. Here's what each flag does:

• -dM: Dumps all the macros currently defined.
• -E: Runs only the preprocessor, skipping compilation and linking.
• < /dev/null: Prevents the need for a source file by providing an empty

input.

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