"Image is too small." error

[AArnott]

pdb2pdb fails with:

Image is too small.

For a 2KB portable pdb produced with a library with just this one source file.

Why is there a min size limit? Do I seriously have to make my library bigger before my PDB can be converted into a Windows PDB?

[AArnott]

It turns out this error happens when the first argument is the path to the input pdb rather than its .dll companion.
Poor error message for this situation, perhaps.
I wonder why the .dll is even relevant here.

[tmat]

The metadata in the dll are required for the conversion. It can also contain embedded PDB.

[tmat]

Yes, the error message could be improved.