[llvm-bugs] [Bug 45756] New: [MS ABI] default closure constructor missing with dllexport

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45756

            Bug ID: 45756
           Summary: [MS ABI] default closure constructor missing with
                    dllexport
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zahira.ammarguellat at intel.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Considering t2.cpp:

struct __declspec(dllexport) foo {
  foo(int a = 0) {};
};
int main()
{
  foo f[3];
  return 0;
}

When compiled with MSVC these are the symbols generated:

ksh-3.2$ dumpbin /symbols t2.obj | grep  foo
013 00000000 SECT4  notype ()    External     | ??0foo@@QEAA at H@Z (public:
__cdecl foo::foo(int))
014 00000000 SECT6  notype ()    External     | ??4foo@@QEAAAEAU0 at AEBU0@@Z
(public: struct foo & __cdecl foo::operator=(struct foo const &))
015 00000000 SECT5  notype ()    External     | ??4foo@@QEAAAEAU0@$$QEAU0@@Z
(public: struct foo & __cdecl foo::operator=(struct foo &&))
016 00000000 SECT7  notype ()    External     | ??_Ffoo@@QEAAXXZ (public: void
__cdecl foo::`default constructor closure'(void))
023 00000000 SECTB  notype       Static       | $unwind$??_Ffoo@@QEAAXXZ
026 00000000 SECTC  notype       Static       | $pdata$??_Ffoo@@QEAAXXZ
ksh-3.2$

When compiled with clang these are the symbols generated:

ksh-3.2$ dumpbin /symbols t2.o | grep  foo
008 00000000 SECT4  notype ()    External     | ??4foo@@QEAAAEAU0 at AEBU0@@Z
(public: struct foo & __cdecl foo::operator=(struct foo const &))
00D 00000000 SECT5  notype ()    External     | ??4foo@@QEAAAEAU0@$$QEAU0@@Z
(public: struct foo & __cdecl foo::operator=(struct foo &&))
ksh-3.2$

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