I really cannot recall which library it was exactly. I worked on a project that had many proprietary dependencies. It might have been a GenICam camera driver that caused us a lot of other headaches as well.

I would guess a normal project that involves this would be making a hack for a video game

Games ship with symbols unstripped?

You'd be suprised what games accidentally ship. I've seen everything from pdbs to unoptimized debug builds accidentally included. If you don't make those mistakes, you might still have std::type_info (or custom equivalents) / RTTI info and __FILE__ / __LINE__ spam from macros, that can still sneak their way in.

Suppose you fix all that - the game still has a good chance of including 1 or more scripting languages. They may be included complete in their original unobufscated glory. Or the bytecode might include unstripped debug information. Or the C++ <-> script binding layer might still include unobfuscated string identifiers.

If you're clever, you'll rebrand this lack of obfuscation as being "mod friendly" ;)

Wouldn't that be useful for crash reporting?

The standard approach to this, at least on Windows, is to build the debug symbols into a separate database (PDB file), and reconnect the addresses to the symbol names on the back end. Microsoft makes tons of symbols available for their own code via a symbol server which debuggers can query by the combination of a module hash and a relative virtual address.

Some games do, sometimes during a beta.