llvm-project/clang/test/Sema/dllexport.c

// RUN: %clang_cc1 -triple i686-win32     -fsyntax-only -fms-extensions -verify -std=c99 %s
// RUN: %clang_cc1 -triple x86_64-win32   -fsyntax-only -fms-extensions -verify -std=c11 %s
// RUN: %clang_cc1 -triple i686-mingw32   -fsyntax-only -fms-extensions -verify -std=c11 %s
// RUN: %clang_cc1 -triple x86_64-mingw32 -fsyntax-only -fms-extensions -verify -std=c99 %s

// Invalid usage.
__declspec(dllexport) typedef int typedef1;
// expected-warning@-1{{'dllexport' attribute only applies to variables and functions}}
typedef __declspec(dllexport) int typedef2;
// expected-warning@-1{{'dllexport' attribute only applies to variables and functions}}
typedef int __declspec(dllexport) typedef3;
// expected-warning@-1{{'dllexport' attribute only applies to variables and functions}}
typedef __declspec(dllexport) void (*FunTy)();
// expected-warning@-1{{'dllexport' attribute only applies to variables and functions}}
enum __declspec(dllexport) Enum { EnumVal };
// expected-warning@-1{{'dllexport' attribute only applies to variables and functions}}
struct __declspec(dllexport) Record {};
// expected-warning@-1{{'dllexport' attribute only applies to variables and functions}}



//===----------------------------------------------------------------------===//
// Globals
//===----------------------------------------------------------------------===//

// Export declaration.
__declspec(dllexport) extern int ExternGlobalDecl;

// dllexport implies a definition.
__declspec(dllexport) int GlobalDef;

// Export definition.
__declspec(dllexport) int GlobalInit1 = 1;
int __declspec(dllexport) GlobalInit2 = 1;

// Declare, then export definition.
__declspec(dllexport) extern int GlobalDeclInit;
int GlobalDeclInit = 1;

// Redeclarations
__declspec(dllexport) extern int GlobalRedecl1;
__declspec(dllexport)        int GlobalRedecl1;

__declspec(dllexport) extern int GlobalRedecl2;
                             int GlobalRedecl2;

                      extern int GlobalRedecl3; // expected-note{{previous declaration is here}}
int useGlobalRedecl3() { return GlobalRedecl3; }
__declspec(dllexport) extern int GlobalRedecl3; // expected-error{{redeclaration of 'GlobalRedecl3' cannot add 'dllexport' attribute}}

                      extern int GlobalRedecl4; // expected-note{{previous declaration is here}}
__declspec(dllexport) extern int GlobalRedecl4; // expected-warning{{redeclaration of 'GlobalRedecl4' should not add 'dllexport' attribute}}


// External linkage is required.
__declspec(dllexport) static int StaticGlobal; // expected-error{{'StaticGlobal' must have external linkage when declared 'dllexport'}}

// Thread local variables are invalid.
__declspec(dllexport) __thread int ThreadLocalGlobal; // expected-error{{'ThreadLocalGlobal' cannot be thread local when declared 'dllexport'}}

// Export in local scope.
void functionScope() {
  __declspec(dllexport)        int LocalVarDecl; // expected-error{{'LocalVarDecl' must have external linkage when declared 'dllexport'}}
  __declspec(dllexport)        int LocalVarDef = 1; // expected-error{{'LocalVarDef' must have external linkage when declared 'dllexport'}}
  __declspec(dllexport) extern int ExternLocalVarDecl;
  __declspec(dllexport) static int StaticLocalVar; // expected-error{{'StaticLocalVar' must have external linkage when declared 'dllexport'}}
}



//===----------------------------------------------------------------------===//
// Functions
//===----------------------------------------------------------------------===//

// Export function declaration. Check different placements.
__attribute__((dllexport)) void decl1A(); // Sanity check with __attribute__
__declspec(dllexport)      void decl1B();

void __attribute__((dllexport)) decl2A();
void __declspec(dllexport)      decl2B();

// Export function definition.
__declspec(dllexport) void def() {}

// Export inline function.
__declspec(dllexport) inline void inlineFunc1() {}
extern void inlineFunc1();

inline void __attribute__((dllexport)) inlineFunc2() {}
extern void inlineFunc2();

// Redeclarations
__declspec(dllexport) void redecl1();
__declspec(dllexport) void redecl1();

__declspec(dllexport) void redecl2();
                      void redecl2();

__declspec(dllexport) void redecl3();
                      void redecl3() {}

                      void redecl4(); // expected-note{{previous declaration is here}}
void useRedecl4() { redecl4(); }
__declspec(dllexport) void redecl4(); // expected-error{{redeclaration of 'redecl4' cannot add 'dllexport' attribute}}

                      void redecl5(); // expected-note{{previous declaration is here}}
void useRedecl5() { redecl5(); }
__declspec(dllexport) inline void redecl5() {} // expected-error{{redeclaration of 'redecl5' cannot add 'dllexport' attribute}}

// Allow with a warning if the decl hasn't been used yet.
                      void redecl6(); // expected-note{{previous declaration is here}}
__declspec(dllexport) void redecl6(); // expected-warning{{redeclaration of 'redecl6' should not add 'dllexport' attribute}}


// External linkage is required.
__declspec(dllexport) static int staticFunc(); // expected-error{{'staticFunc' must have external linkage when declared 'dllexport'}}

// Static locals don't count as having external linkage.
void staticLocalFunc() {
  __declspec(dllexport) static int staticLocal; // expected-error{{'staticLocal' must have external linkage when declared 'dllexport'}}
}



//===----------------------------------------------------------------------===//
// Precedence
//===----------------------------------------------------------------------===//

// dllexport takes precedence over dllimport if both are specified.
__attribute__((dllimport, dllexport))       extern int PrecedenceExternGlobal1A; // expected-warning{{'dllimport' attribute ignored}}
__declspec(dllimport) __declspec(dllexport) extern int PrecedenceExternGlobal1B; // expected-warning{{'dllimport' attribute ignored}}

__attribute__((dllexport, dllimport))       extern int PrecedenceExternGlobal2A; // expected-warning{{'dllimport' attribute ignored}}
__declspec(dllexport) __declspec(dllimport) extern int PrecedenceExternGlobal2B; // expected-warning{{'dllimport' attribute ignored}}

__attribute__((dllimport, dllexport))       int PrecedenceGlobal1A; // expected-warning{{'dllimport' attribute ignored}}
__declspec(dllimport) __declspec(dllexport) int PrecedenceGlobal1B; // expected-warning{{'dllimport' attribute ignored}}

__attribute__((dllexport, dllimport))       int PrecedenceGlobal2A; // expected-warning{{'dllimport' attribute ignored}}
__declspec(dllexport) __declspec(dllimport) int PrecedenceGlobal2B; // expected-warning{{'dllimport' attribute ignored}}

__declspec(dllexport) extern int PrecedenceExternGlobalRedecl1;
__declspec(dllimport) extern int PrecedenceExternGlobalRedecl1; // expected-warning{{'dllimport' attribute ignored}}

__declspec(dllimport) extern int PrecedenceExternGlobalRedecl2; // expected-warning{{'dllimport' attribute ignored}}
__declspec(dllexport) extern int PrecedenceExternGlobalRedecl2;

__declspec(dllexport) extern int PrecedenceGlobalRedecl1;
__declspec(dllimport)        int PrecedenceGlobalRedecl1; // expected-warning{{'dllimport' attribute ignored}}

__declspec(dllimport) extern int PrecedenceGlobalRedecl2; // expected-warning{{'dllimport' attribute ignored}}
__declspec(dllexport)        int PrecedenceGlobalRedecl2;

void __attribute__((dllimport, dllexport))       precedence1A() {} // expected-warning{{'dllimport' attribute ignored}}
void __declspec(dllimport) __declspec(dllexport) precedence1B() {} // expected-warning{{'dllimport' attribute ignored}}

void __attribute__((dllexport, dllimport))       precedence2A() {} // expected-warning{{'dllimport' attribute ignored}}
void __declspec(dllexport) __declspec(dllimport) precedence2B() {} // expected-warning{{'dllimport' attribute ignored}}

void __declspec(dllimport) precedenceRedecl1(); // expected-warning{{'dllimport' attribute ignored}}
void __declspec(dllexport) precedenceRedecl1() {}

void __declspec(dllexport) precedenceRedecl2();
void __declspec(dllimport) precedenceRedecl2() {} // expected-warning{{'dllimport' attribute ignored}}