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The telephone switching system ESS 5 has 100 million lines of code.

Many enterprises, particularly software-focused ones, are likely to have 30 million lines of code or more.

That's true though, as far as the open source projects go.

Only bigger C++ open source codebase I can think of is LLVM. What else did you have in mind?

Closed source codebases, presumably.

Er, firefox is reported to have 12 million, while llvm has 2 million. gcc is 7 million.

How many thousands are larger? Now how many thousands are smaller?

Taking a total shot in the dark, but I imagine AAA video games constitute a crap-ton of C++ codebases larger than Firefox, but I wouldn't know for sure.

Finance tends to write a lot of C++ too, but I couldn't possibly estimate their code base sizes.