Tracked down the crash, which was argument-evaluation-order UB
in the wrapping indexStandardLibrary().
Sorry for the churn!
This reverts commit 77533ea443.
This reverts commit ccdb56ac10.
Still seeing windows failures on GN bots: http://45.33.8.238/win/58316/step_9.txt
Unfortunately I can't debug these at all - it's a bare unsymbolized
stacktrace, and I can't reproduce the failure.
This provides a nice "warm start" with all headers indexed, not just
those included so far.
The standard library is indexed after a preamble is parsed, using that
file's configuration. The result is pushed into the dynamic index.
If we later see a higher language version, we reindex it.
It's configurable as Index.StandardLibrary, off by default for now.
Based on D105177 by @kuhnel
Fixes https://github.com/clangd/clangd/issues/618
Differential Revision: https://reviews.llvm.org/D115232
Sam McCall