clang/test/Sema/warn-extern-main.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST1
   2 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST2
   3 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST3
   4 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST4
   5 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST5
   6 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST6
   7 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST7
   8 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST8
   9 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST9 -ffreestanding
  10
  11 #if TEST1
  12 int main; // expected-warning{{variable named 'main' with external linkage has undefined behavior}}
  13
  14 #elif TEST2
  15 extern int main; // expected-warning{{variable named 'main' with external linkage has undefined behavior}}
  16
  17 #elif TEST3
  18 // expected-no-diagnostics
  19 void x(void) {
  20   static int main;
  21 }
  22
  23 #elif TEST4
  24 void x(void) {
  25   extern int main; // expected-warning{{variable named 'main' with external linkage has undefined behavior}}
  26 }
  27
  28 #elif TEST5
  29 // expected-no-diagnostics
  30 void x(void) {
  31   int main;
  32 }
  33
  34 #elif TEST6
  35 // expected-no-diagnostics
  36 static int main;
  37
  38 #elif TEST7
  39 // expected-no-diagnostics
  40 void x(void) {
  41   auto int main;
  42 }
  43
  44 #elif TEST8
  45 // expected-no-diagnostics
  46 void x(void) {
  47   register int main;
  48 }
  49
  50 #elif TEST9
  51 // expected-no-diagnostics
  52 int main;
  53
  54 #else
  55 #error Unknown Test
  56 #endif