cmd/cgo: Opaque pointers handled incorrectly #6473
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For Test3, sure I am. And it works. Test2 isn't a unique type, it's just an alias of void (another typedef of void would be considered the same type in C). Test1 is a unique and honest type. It declares "something" that can be passed around as a pointer, but not understandable by C. These two types are considered different in C: typedef struct Foo Foo; typedef struct Bar Bar; Yet Go translates both explicitly to [0]byte. The two should be separately translated to _Ctype_Foo _Ctype_Bar. Strangely in my example Test2 is given a type, but that type is not used. Test1 is a legitiment type, yet none is generated or used. I guess to make this work I will have to continue lying to cgo. Although I don't consider "typedef struct Test1 Test1;" a lie at all. |
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What steps will reproduce the problem? This code: #ifdef __cplusplus class Test1 {}; class Test2 {}; class Test3 {}; #else typedef struct Test1 Test1; typedef void Test2; typedef int Test3; #endif Should generate Go types and use them in functions. What is the expected output? _cgo_gotypes.go: // ... type _Ctype_void [0]byte type _Ctype_int int32 type _Ctype_Test1 _Ctype_void type _Ctype_Test2 _Ctype_void type _Ctype_Test3 _Ctype_int func _Cfunc_TestFunc1(*_Ctype_Test1) _Ctype_void func _Cfunc_TestFunc2(*_Ctype_Test2) _Ctype_void func _Cfunc_TestFunc3(*_Ctype_Test3) _Ctype_void What do you see instead? _cgo_gotypes.go: // ... type _Ctype_Test2 _Ctype_void type _Ctype_Test3 _Ctype_int type _Ctype_int int32 type _Ctype_void [0]byte func _Cfunc_TestFunc1(*[0]byte) _Ctype_void func _Cfunc_TestFunc2(unsafe.Pointer) _Ctype_void func _Cfunc_TestFunc3(*_Ctype_Test3) _Ctype_void Which compiler are you using (5g, 6g, 8g, gccgo)? gc default g++ 4.8 (GNU) OR clang++ Which operating system are you using? OS X 10.8.5 Which version are you using? (run 'go version') go version devel +f4d1cb8d9a91 Thu Sep 19 22:34:33 2013 +1000 darwin/amd64 Please provide any additional information below. Run it like this: CXX=g++-4.8 go tool cgo -- cgotest.go CXX=clang++ go tool cgo -- cgotest.go Test case attached.Attachments:
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