[Bug 1332307] Review Request: libcxx - C++ standard library targeting C++11

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https://bugzilla.redhat.com/show_bug.cgi?id=1332307



--- Comment #8 from Tom "spot" Callaway <tcallawa@xxxxxxxxxx> ---
(In reply to Antonio Trande from comment #7)
> - I see this warning on Fedora 25 64bit:
> 
> -- Found LLVM_CONFIG as /usr/bin/llvm-config
> CMake Warning at cmake/Modules/HandleOutOfTreeLLVM.cmake:46 (message):
>   Not found: /builddir/build/BUILD/llvm-3.8.0.src
> Call Stack (most recent call first):
>   cmake/Modules/HandleOutOfTreeLLVM.cmake:67 (find_llvm_parts)
>   CMakeLists.txt:37 (include)
> CMake Warning at CMakeLists.txt:39 (message):
>   UNSUPPORTED LIBCXX CONFIGURATION DETECTED: llvm-config not found and
>   LLVM_PATH not defined.
>   Reconfigure with -DLLVM_CONFIG=path/to/llvm-config or
>   -DLLVM_PATH=path/to/llvm-source-root.
> 
> On 64 bit systems, llvm-config looks not available; it's llvm-config-64.

Yes, but alternatives makes a symlink to llvm-config, so it is safe to always
call that.

> - Flags for hardened_builds are not used with clang.

Yes, but they're also safely ignored by clang.

> - Why do you not perform tests ?

Couldn't figure out how to run them, think it might require a full llvm source
tree.

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