__declspec(dllexport) ignored on specialized function definitions


Bugzilla Link	PR44016
Status	NEW
Importance	P enhancement
Reported by	Mark Ingram (me@mark-ingram.com)
Reported on	2019-11-15 14:01:05 -0800
Last modified on	2019-11-19 12:43:14 -0800
Version	8.0
Hardware	PC Windows NT
CC	hans@chromium.org, htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, martin@martin.st, neeilans@live.com, paul_robinson@playstation.sony.com, richard-llvm@metafoo.co.uk, rnk@google.com, smeenai@fb.com
Fixed by commit(s)
Attachments	`declspec_dllexport.zip` (1000 bytes, application/x-zip-compressed)
Blocks
Blocked by
See also	PR20136, PR20725, PR41895

Created attachment 22817
Example

Please see the attached files. Templated class functions that are specialized,
aren't added to the list of exported functions. In the attached example, any
binary linking to this shared library will fail to find dll<int>::Func().

// dll.hpp
#ifdef DLL_EXPORT
#define DLL_API __declspec(dllexport)
#else
#define DLL_API __declspec(dllimport)
#endif

template <typename T>
struct dll
{
    DLL_API static void Func();
};

// dll.cpp
#define DLL_EXPORT
#include "dll.hpp"

#include <stdio.h>

template <>
void dll<int>::Func()
{
    printf("dll<int>::Func1\n");
}

template class DLL_API dll<int>;

Quuxplusone / LLVMBugzillaTest

__declspec(dllexport) ignored on specialized function definitions #42986