GCC preprocessor [duplicate]

by

Use gcc -E to only run the preprocessor part, e.g. give a file in.c

#if 0
0;
#endif

#if 1
1;
#endif

running

$ gcc -E in.c -o in.i

yields a file in.i

# 1 "in.cpp"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "in.cpp"





1;

i.e. the parts behind the #if 0 got removed. If you would have #include‘d files they would have been pasted too though, so I am not sure how much help this is.

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