<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - "fragment covers entire variable" error in Windows selfhost build"
   href="https://bugs.llvm.org/show_bug.cgi?id=35416">35416</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>"fragment covers entire variable" error in Windows selfhost build
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>new bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>greg.bedwell@sony.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>aprantl@apple.com, llvm-bugs@lists.llvm.org, rnk@google.com, russell_gallop@sn.scee.net
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Spotted when setting up a Windows x64 selfhost clang build.

Looks like it started appearing in r318203 - "Make salvageDebugInfo of casts
work for dbg.declare and dbg.addr".  Superficially, looks a bit like <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - "fragment covers entire variable" verifier error in chromium build"
   href="show_bug.cgi?id=34390">Bug 34390</a>,
but I've not had a chance to look at the error in any detail tonight
unfortunately.

Reduced testcase:

$ type 2.cpp
// ==========================================
struct A { double x1[]; };
struct x2 {
  x2(int) : x3() {}
  int x3;
};
int x4();
x2 x5() {
  x2 a(x4());
  return a;
}
void *operator new(size_t, void *);
struct B {
  B() { new (x8.x1) x2(x5()); }
  A x8;
};
void x9() { B(); }
// ==========================================

$
C:\work\public-git\upstream-llvm\build-vs2015-native-master\Release\bin\clang.exe
-c 2.cpp -O2 -g -target x86_64-pc-windows-msvc
fragment covers entire variable
  tail call void @llvm.dbg.value(metadata i32 0, metadata !20, metadata
!DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !67
!20 = !DILocalVariable(name: "a", scope: !8, file: !1, line: 9, type: !11)
fragment covers entire variable
  tail call void @llvm.dbg.value(metadata i32 0, metadata !20, metadata
!DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !67
!20 = !DILocalVariable(name: "a", scope: !8, file: !1, line: 9, type: !11)
fatal error: error in backend: Broken module found, compilation aborted!
clang.exe: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 6.0.0 (trunk 318960) (llvm/trunk 318966)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir:
C:\work\public-git\upstream-llvm\build-vs2015-native-master\Release\bin
clang.exe: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang.exe: note: diagnostic msg:
********************</pre>
        </div>
      </p>


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