[llvm-bugs] [Bug 33446] New: COFF: LLD fails to discard associative comdat sections with /OPT:NOREF

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33446

            Bug ID: 33446
           Summary: COFF: LLD fails to discard associative comdat sections
                    with /OPT:NOREF
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: COFF
          Assignee: unassignedbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvm-bugs at lists.llvm.org

The following test case should print "in ctor" once, but it prints twice:

$ cat a.cpp
extern "C" int puts(const char *);
struct Foo {
  Foo() : x(42) { puts("in ctor"); }
  int x;
};
Foo __declspec(selectany) f;

$ cat b.cpp
#include "a.cpp"
int main() {
  puts("main");
  return f.x;
}

$ cl -c a.cpp b.cpp && lld-link -opt:noref a.obj b.obj -out:t.exe && ./t.exe ;
echo $?
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24215.1 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

a.cpp
b.cpp
Generating Code...
in ctor
in ctor
main
42

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