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The problem with libstdc++ is that, in my experience, 90% of bug reports are user error. That means non reproducible bug reports have almost no value.

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I know you were probably just throwing out the “90%” statistic, but if you take that as a given, the implication that 10% of the libstdc++ bugs on file are legit is a worrisome notion in and of its own right. I don’t want to be responsible for triaging those bugs (and nor do you, I am guessing; this being why the reports are valueless) but the fact that this is the bug rate in this, a gold-standard library in common, ubiquitous use… well as far as I can see, this is the context in which that the OP’s article should be considered.

… I build all of my C++ projects with Clang and link them against libc++, so I don’t know if I am dodging a very high-caliber bullet (so to speak) or if the other shoe will drop at some point, and I will find myself going down the OP’s rabbit-hole of library-bug investigation.

You are right, it's probably a lot less than that.

The bug quality is higher than you might expect, because you have to register with bugzilla, and most bug reports are with development versions, as bugs are shaken out of new features. There are very few bugs in released versions, and where those bugs exist they are often of the form "stupid type where I have redefined & doesn't compile, while the standard technically days it should", where most users would never got them. Wrong answer or crash bugs in releases are extremely rare, although they could be rarer -- the test suite has less coverage than I would personally like.

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