[llvm-bugs] [Bug 38465] New: Compiling LLVM with CLang makes Unwind_Backtrace detection to fail

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38465

            Bug ID: 38465
           Summary: Compiling LLVM with CLang makes Unwind_Backtrace
                    detection to fail
           Product: Build scripts
           Version: 6.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: stormbyte at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20651
  --> https://bugs.llvm.org/attachment.cgi?id=20651&action=edit
correct unwind backtrace detection

For some reason, when trying to compile llvm with clang in Gentoo (tested
version 6.0.1), fails Unwind_Backtrace detection despite package llvm-libunwind
is installed.

I attach a patch which makes the detection work for reviewing.

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