zahiraam added a comment.
@majnemer
I did take an example completely different with no use of the constexpr in
order to understand (at least for me) when the _imp prefix is generated with CL.
This is sample.cpp:
#include<iostream>
__declspec(dllexport) void PrintHello()
{
std::cout << "hello" << std::endl;
}
$ cl sample.cpp /LD /EHsc
Microsoft (R) C/C++ Optimizing Compiler Version 19.16.27045 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
sample.cpp
Microsoft (R) Incremental Linker Version 14.16.27045.0
Copyright (C) Microsoft Corporation. All rights reserved.
/out:sample.dll
/dll
/implib:sample.lib
sample.obj
Creating library sample.lib and object sample.exp
$
This is testapp.cpp:
extern void __declspec(dllimport)PrintHello();
void main()
{
PrintHello();
}
$ cl testapp.cpp /EHsc /link sample.lib
Microsoft (R) C/C++ Optimizing Compiler Version 19.16.27045 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
testapp.cpp
Microsoft (R) Incremental Linker Version 14.16.27045.0
Copyright (C) Microsoft Corporation. All rights reserved.
/out:testapp.exe
sample.lib
testapp.obj
$
$ dumpbin /symbols testapp.obj | grep imp
008 00000000 UNDEF notype External | __imp_?PrintHello@@YAXXZ
(__declspec(dllimport) void __cdecl PrintHello(void))
$
My understanding that the _imp prefix is generated because of the dllimport in
testapp.cpp.
So if we go back to the test case above:
extern int __declspec(dllimport) dll_import_int;
constexpr int& dll_import_constexpr_ref = dll_import_int;
int& get() {
return dll_import_constexpr_ref;
}
int main () {
get();
return 0;
}
CLANG (with this patch and ICL for that matter) generates the symbol:
011 00000000 UNDEF notype External | __imp_?dll_import_int@@3HA
(__declspec(dllimport) int dll_import_int)
but not MSVC. This seems incorrect to me since the _imp prefix is always
generated for dllimport symbols?
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D117569/new/
https://reviews.llvm.org/D117569
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