xref: /llvm-project/clang/test/SemaCXX/warn-missing-prototypes.cpp (revision 34b9b1ea4874b109b998d59a837f81f2f730001c)
1 // RUN: %clang_cc1 -fsyntax-only -verify -Wmissing-prototypes -std=c++11 %s
2 // RUN: %clang_cc1 -fsyntax-only -Wmissing-prototypes -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
3 
f()4 void f() { } // expected-warning {{no previous prototype for function 'f'}}
5 // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
6 // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:1-[[@LINE-2]]:1}:"static "
7 
8 namespace NS {
f()9   void f() { } // expected-warning {{no previous prototype for function 'f'}}
10   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
11 }
12 
13 namespace {
14   // Don't warn about functions in anonymous namespaces.
f()15   void f() { }
16   // Even if they're in nested namespaces within an anonymous namespace.
17   namespace NS {
f()18     void f() { }
19   }
20 }
21 
22 struct A {
23   // Don't warn about member functions.
fA24   void f() { }
25 };
26 
27 // Don't warn about inline functions.
g()28 inline void g() { }
29 
30 // Don't warn about function templates.
h()31 template<typename> void h() { }
32 
33 // Don't warn when instantiating function templates.
34 template void h<int>();
35 
36 // PR9519: don't warn about friend functions.
37 class I {
I_friend()38   friend void I_friend() {}
39 };
40 
41 // Don't warn on explicitly deleted functions.
42 void j() = delete;
43 
k()44 extern void k() {} // expected-warning {{no previous prototype for function 'k'}}
45 // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
46 // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-2]]:{{.*}}-[[@LINE-2]]:{{.*}}}:"{{.*}}"
47 
48 namespace {
49 struct anon { };
50 }
51 
52 // No warning because this has internal linkage despite not being declared
53 // explicitly 'static', owing to the internal linkage parameter.
l(anon)54 void l(anon) {
55 }
56 
57 void *operator new(decltype(sizeof(3)) size, const anon &) throw() {
58   return nullptr;
59 }
60