Read "3.10.6 Argument Prescan" in documentation for precompiler - everything
is clear!
#include <stdio.h>
#define sym_a sym_b
#define macro_over(x) x ## m
#define macro_over1_5(x) macro_over(x)
#define macro_over2(x) #x
#define macro_over2_5(x) macro_over2(x)
int main()
{
printf("%s\n", macro_over2_5(macro_over1_5(sym_a)));
}
Work well!
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