[LLVMbugs] [Bug 24291] New: clang-cl doesn't respect noinline on methods of dllimported classes

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24291

            Bug ID: 24291
           Summary: clang-cl doesn't respect noinline on methods of
                    dllimported classes
           Product: clang
           Version: trunk
          Hardware: PC
               URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1188045
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ehsan at mozilla.com
                CC: david.majnemer at gmail.com, hans at chromium.org,
                    llvmbugs at cs.uiuc.edu, rnk at google.com
    Classification: Unclassified

See the Mozilla bug, specifically this test case from
https://bugzilla.mozilla.org/show_bug.cgi?id=1188045#c5:

$ cat test.cpp
class __declspec(dllimport) Test
{
public:
  void Hello();

  __declspec(noinline) static Test* Instance()
  {
    static Test singleton;
    return &singleton;
  }
};

int main()
{
  Test::Instance()->Hello();
  return 0;
}

$ (cl -nologo -c -O2 test.cpp && dumpbin -all test.obj) | grep singleton

$ (clang-cl -nologo -c -O2 test.cpp && dumpbin -all test.obj) | grep singleton
 00000002  DIR32                      00000000         A 
__imp_?singleton@?1??I
nstance at Test@@SAPAV2 at XZ@4V2 at A (__declspec(dllimport) class Test `public: static
class Test * __cdecl Test::Instance(void)'::`2'::singleton)
00A 00000000 UNDEF  notype       External     |
__imp_?singleton@?1??Instance at Te
st@@SAPAV2 at XZ@4V2 at A (__declspec(dllimport) class Test `public: static class
Test
 * __cdecl Test::Instance(void)'::`2'::singleton)

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