clang/test/Sema/expr-comma-c99.c

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify -std=c99 -Wno-sizeof-array-decay
   2 // rdar://6095180
   3
   4 struct s { char c[17]; };
   5 extern struct s foo(void);
   6
   7 struct s a, b, c;
   8
   9 int A[sizeof((foo().c)) == 17 ? 1 : -1];
  10 int B[sizeof((a.c)) == 17 ? 1 : -1];
  11
  12
  13 // comma does array/function promotion in c99.
  14 int X[sizeof(0, (foo().c)) == sizeof(char*) ? 1 : -1];
  15 int Y[sizeof(0, (a,b).c) == sizeof(char*) ? 1 : -1];
  16 int Z[sizeof(0, (a=b).c) == sizeof(char*) ? 1 : -1]; // expected-warning {{expression with side effects has no effect in an unevaluated context}}
  17