check source code after macro expand

Some time I'd like check source code after macro expand.

We can use -E option to stop after the preprocessing stage, do not run the compiler.

The source code of test_macro.c

#define TEST_MACRO(a,b)   a,,,,,,b

int main(void)

{

        TEST_MACRO(xxx,yyy)

        return 0;

}

$ gcc -E test_macro.c

# 1 "test_macro.c"

# 1 "<built-in>"

# 1 "<command-line>"

# 1 "/usr/include/stdc-predef.h" 1 3 4

# 1 "<command-line>" 2

# 1 "test_macro.c"

int main(void)

{

        xxx,,,,,,yyy

        return 0;

}

gcc option -E

巴特西

check source code after macro expand

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