[LLVMbugs] [Bug 23364] New: Untangle libunwind from libc++abi and compiler-rt

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23364

            Bug ID: 23364
           Summary: Untangle libunwind from libc++abi and compiler-rt
           Product: libc++abi
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: renato.golin at linaro.org
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

Now that we moved libunwind to its own repository, and have made it compile and
run on buildbots around, we need to make sure we get all dependencies correct:

1. No hard-coded dependencies on any other component. Most relevant are
compiler-rt and libc++abi.

2. No cyclic dependency between all three low-level libraries, with both
compiler-rt and libc++abi using libunwind and not each other.

3. Build systems / CMake files need to be aware of the existence, so libunwind
can be used inside LLVM (projects/libunwind) and be used directly by
compiler-rt/libc+abi in case CMake options allow for this.

4. Different systems will have different defaults. For example, it's perfectly
valid for GNU systems to rely on libgcc / libgcc_s by default and BSD systems
to rely on compiler-rt / libunwind. There should be CMake settings for either
to change their behaviour.

5. All tests must pass in the targets they were passing before, namely
x86_64/ARM on linux/darwin.

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