Previously, the list of libc++abi symbols that we re-export from libc++
would be partly encoded in libc++abi (and re-exported automatically via
the cxxabi-reexports target), and partly hard-coded in
libcxx/lib/libc++abi.exp. The duplication of information led to symbols
not being exported from libc++ after being added to libc++abi when they
should have been.
This patch removes the duplication of information. After this patch, the
full list of symbols to re-export from libc++abi is handled by the
cxxabi-reexports target and is stored in libcxxabi.
The symbols newly re-exported from libc++ are mainly new fundamental
typeinfos and a bunch of functions and classes that are part of
libc++abi but are most likely implementation details. In the future, it
would be possible to try to trim down the set of what we export from
libc++abi (and hence what we re-export from libc++) to remove some
implementation detail symbols.
Fixes#79008
We've stopped doing it in libc++ for a while now because these names
would end up rotting as we move things around and copy/paste stuff.
This cleans up all the existing files so as to stop the spreading
as people copy-paste headers around.
Instead of having different names for the same Lit feature accross code
bases, use the same name everywhere. This NFC commit is in preparation
for a refactor where all three projects will be using the same Lit
feature detection logic, and hence it won't be convenient to use
different names for the feature.
Differential Revision: https://reviews.llvm.org/D78370
