<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/101039>101039</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            `llvm-dwp` reports an error when given a simple program
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            tools:llvm-dwp
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          cjdb
      </td>
    </tr>
</table>

<pre>
    # Problem

`llvm-dwp` reports an error when given a simple program, regardless of compiler.

# System info

* Current system: Debian
* Also observed on Ubuntu 24.04 with LLVM 19 from apt.llvm.org
* Also observed on Arch Linux 

```
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/cjdb/opt/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --enable-lto --prefix=/home/cjdb/opt --disable-nls --enable-languages=c,c++ --enable-gold --disable-multilib --disable-werror : (reconfigured) ../gcc/configure --enable-lto --prefix=/home/cjdb/opt --disable-nls --enable-gold --disable-multilib --disable-werror CC=gcc CFLAGS='-g0 -O3 -DNDEBUG' LDFLAGS=-fuse-ld=gold CXX=g++ CXXFLAGS='-g0 -O3 -DNDEBUG' --enable-languages=c,c++,lto --no-create --no-recursion
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240621 (experimental) (GCC)
```

```
$ clang -v
clang version 20.0.0git (/home/cjdb/projects/llvm-project/clang 135a1e90a3066f61ca741e9ebebfec79c9595ea5)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cjdb/opt/bin
Found candidate GCC installation: /home/cjdb/opt/bin/../lib/gcc/x86_64-pc-linux-gnu/14.0.1
Found candidate GCC installation: /home/cjdb/opt/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.0
Selected GCC installation: /home/cjdb/opt/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
```

```
$ llvm-dwp --version
LLVM (http://llvm.org/):
  LLVM version 20.0.0git
 Optimized build.
```

# Examples

**GCC**

```
$ cat hello.cpp
#include <iostream>

int main()
{
  int a;
 std::cin >> a;
  std::cout << (a + 1) << '\n';
}
$ g++ -c -o hello.o hello.cpp -g -gsplit-dwarf
$ g++ -c -o hello.o hello.cpp -g -gsplit-dwarf -fuse-ld=lld
$ g++ -o hello hello.o -fuse-ld=lld
$ ./hello
10
11
$ llvm-dwp -e hello
while processing dwarf streamer init:
error: : No such file or directory
```

**Clang**

```
$ ls
hello  hello.cpp hello.dwo  hello.o
$ rm hello hello.dwo hello.o
$ clang++ -c -o hello.o hello.cpp -g -gsplit-dwarf -fuse-ld=lld
clang++: warning: argument unused during compilation: '-fuse-ld=lld' [-Wunused-command-line-argument]
$ clang++ -o hello hello.o -fuse-ld=lld
$ ./hello
13
14
$ llvm-dwp -e hello
while processing dwarf streamer init:
error: : No such file or directory
```

# Related issues

https://sourceware.org/bugzilla/show_bug.cgi?id=32032
</pre>
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