Louis Dionne 2121b961fd
[libc++abi][libunwind] Run c++abi and unwind tests against a fake install root (#110171)
This is what we started doing in libc++ and it straightens up a lot of
things that only happened to work before, notably the presence of
relative rpaths in dylibs when running from the build tree.

This unlocks the ability to link against a just-built dylib but run
against another version of the dylib (for example the system-provided
one), which is necessary for proper backdeployment testing.

This patch adds a lot of code duplication between the libc++ and
libc++abi testing setups. However, there is already a large amount of
duplication and the only real way to get rid of it is to merge libc++abi
into libc++. In a way, this patch is a step in that direction because it
closes the gap between the two libraries' testing setup.
2024-09-30 11:57:35 -04:00
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