[llvm-bugs] [Bug 49725] New: LLVM Passes issue: unknown pass name

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49725

            Bug ID: 49725
           Summary: LLVM Passes issue: unknown pass name
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Transformation Utilities
          Assignee: unassignedbugs at nondot.org
          Reporter: rui at deniable.org
                CC: llvm-bugs at lists.llvm.org

I didn't root cause the issue. However, the current 'main' branch Passes seems
broken.

To reproduce, git clone current main branch. Build it, and create any sample C
program. Like:

int foo() {
  return 0;
}

int main() {
  foo();
  return 0;
}

and then run:

```
$ ./bin/clang -c -emit-llvm sample.c
$ ./bin/opt -load ./lib/LLVMHello.so -hello < sample.bc

./bin/opt: unknown pass name 'hello'
```

This will happen for any Pass we create too, and that's how I noticed it.

This works fine, if instead of the main branch, we download and build for
example the latest release candidate llvm-project-llvmorg-12.0.0-rc3.tar.gz
source.

The expected behavior would be:

```
$ ./bin/opt -load ./lib/LLVMHello.so -hello < sample.bc

Hello: foo
Hello: main
```

Thank you.

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