[llvm-bugs] [Bug 24923] New: Broken module (piece is larger than or outside of variable) with -g and -flto

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https://llvm.org/bugs/show_bug.cgi?id=24923

            Bug ID: 24923
           Summary: Broken module (piece is larger than or outside of
                    variable) with -g and -flto
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: russell_gallop at sn.scee.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following example has an ODR violation. It compiles okay without -flto or
without -g but with both a broken module is reported.

$ clang --version
clang version 3.8.0 (trunk 248463) (llvm/trunk 248476)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ cat a.cpp
struct P {};
void foo() { P l; }
$ cat b.cpp
struct P {
  int a;
  int b;
};
P fn1() {
  P r;
  r.a = 0;
  return r;
}
$ cat test.sh
#!/bin/bash -e
clang -O2 -g -flto $1 -c -o a.o
clang -O2 -g -flto $2 -c -o b.o
llvm-lto a.o b.o
$ ./test.sh a.cpp b.cpp
piece is larger than or outside of variable
  tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !24, metadata
!32), !dbg !31
!24 = !DILocalVariable(name: "r", scope: !20, file: !12, line: 6, type:
!"_ZTS1P")
!32 = !DIExpression(DW_OP_bit_piece, 0, 32)
LLVM ERROR: Broken module found, compilation aborted!

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