scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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0152-cat.c (269B)

      1 #define CAT(x,y) x ## y
      2 #define XCAT(x,y) CAT(x,y)
      3 #define FOO foo
      4 #define BAR bar
      5 
      6 int foobar;
      7 
      8 int
      9 main(void)
     10 {
     11 	int foo = 1, bar = 0;
     12 
     13 	CAT(foo,bar) += foo + bar;
     14 	if (foobar != 1)
     15 		return 1;
     16 	XCAT(FOO,BAR) += foo + bar;
     17 	if (foobar != 2)
     18 		return 2;
     19 
     20 	return 0;
     21 }