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2cf2f1b2b6
This patch makes a few adjustments to the way we run the tests in the Apple configuration on macOS: First, we stop using DYLD_LIBRARY_PATH. Using that environment variable leads to libc++.dylib being replaced by the just-built one for the whole process, and that assumes compatibility between the system-provided dylib and the just-built one. Unfortunately, that is not the case anymore due to typed allocation, which is only available in the system one. Instead, we want to layer the just-built libc++ on top of the system-provided one, which seems to be what happens when we set a rpath instead. Second, add a missing XFAIL for a std::print test that didn't work as expected when building with availability annotations enabled. When we enable these annotations, std::print falls back to a non-unicode and non-terminal output, which breaks the test.