boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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041-ifndef-defined-else-typedef-fnmacro.c (121B)

      1 #define CCSCM 1
      2 #ifndef CCSCM
      3 extern int unreachable;
      4 #else
      5 typedef char *T;
      6 #define M(x) (x)
      7 #endif
      8 
      9 T a;
     10 int x = M(0);