gcc - Anyway to see list of preprocessor defined macros? -

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i'd see macros defined invocation of compiler i'm using. there way this? have seen in manual says can use cpp -dm doesn't work me. perhaps i'm doing wrong?

when run:

cpp -dm

i no output @ preprocessor. if try adding -dm option on gcc, don't notice difference.

you can use:

gcc -dm -e - < /dev/null

note can compiler macros in addition command:

touch bla.c && gcc -dm -e bla.c

for example on computer:

$ touch bla.c && gcc -dm -e bla.c | wc -l 486 $ gcc -dm -e - < /dev/null | wc -l 124 $

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