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      1 // This is an IR generation test because the calculation of visibility
      2 // during IR gen will cause linkage to be implicitly recomputed and
      3 // compared against the earlier cached value.  If we had a way of
      4 // testing linkage directly in Sema, that would be better.
      5 
      6 // RUN: %clang_cc1 -Werror -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck %s
      7 
      8 // PR8926
      9 namespace test0 {
     10   typedef struct {
     11     void *foo() { return 0; }
     12   } A;
     13 
     14   // CHECK: define linkonce_odr i8* @_ZN5test01A3fooEv(
     15 
     16   void test(A *a) {
     17     a->foo();
     18   }
     19 }
     20 
     21 namespace test1 {
     22   typedef struct {
     23     template <unsigned n> void *foo() { return 0; }
     24 
     25     void foo() {
     26       foo<0>();
     27     }
     28   } A;
     29 
     30   // CHECK: define linkonce_odr void @_ZN5test11A3fooEv(
     31   // another at the end
     32 
     33   void test(A *a) {
     34     a->foo();
     35   }
     36 }
     37 
     38 namespace test2 {
     39   typedef struct {
     40     template <unsigned n> struct B {
     41       void *foo() { return 0; }
     42     };
     43 
     44     void foo(B<0> *b) {
     45       b->foo();
     46     }
     47   } A;
     48 
     49   // CHECK: define linkonce_odr void @_ZN5test21A3fooEPNS0_1BILj0EEE(
     50 
     51   void test(A *a) {
     52     a->foo(0);
     53   }
     54 }
     55 
     56 namespace test3 {
     57   namespace { struct A {}; }
     58 
     59   // CHECK: define internal void @_ZN5test34testENS_12_GLOBAL__N_11AE(
     60   void test(A a) {}
     61   void force() { test(A()); }
     62 
     63   // CHECK: define void @test3(
     64   extern "C" void test3(A a) {}
     65 }
     66 
     67 namespace {
     68   // CHECK: define void @test4(
     69   extern "C" void test4(void) {}
     70 }
     71 
     72 // PR9316: Ensure that even non-namespace-scope function declarations in
     73 // a C declaration context respect that over the anonymous namespace.
     74 extern "C" {
     75   namespace {
     76     struct X {
     77       int f() {
     78         extern int g();
     79         extern int a;
     80 
     81         // Test both for mangling in the code generation and warnings from use
     82         // of internal, undefined names via -Werror.
     83         // CHECK: call i32 @g(
     84         // CHECK: load i32* @a,
     85         return g() + a;
     86       }
     87     };
     88   }
     89   // Force the above function to be emitted by codegen.
     90   int test(X& x) {
     91     return x.f();
     92   }
     93 }
     94 
     95 // CHECK: define linkonce_odr i8* @_ZN5test21A1BILj0EE3fooEv(
     96 // CHECK: define linkonce_odr i8* @_ZN5test11A3fooILj0EEEPvv(
     97