[llvm-bugs] [Bug 31904] New: Legacy libc++abi configuration logic in libc++?

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https://llvm.org/bugs/show_bug.cgi?id=31904

            Bug ID: 31904
           Summary: Legacy libc++abi configuration logic in libc++?
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eric at efcs.ca
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

The configuration in question is seen in exception.cpp:24 and new.cpp:20. In
these places it configures for a `cxxabi.h` which (1) doesn't define
`_LIBCPPABI_VERSION` and (2) defines a special namespace `__cxxabiapple`.

As mentioned I believe this configuration is dead. libc++abi's cxxabi.h has
been defining `_LIBCPPABI_VERSION` since 2012, and I can't find any evidence of
the `__cxxabiapple` namespace.

@Duncan do you know where this weird `cxxabi.h` header is coming from? Or if
Apple still uses it?

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