LLVM_CONFIG-NOTFOUND failed

[pmor13]

Trying to use Clay for the first time, but cmake says:
-- Using llvm-config: LLVM_CONFIG-NOTFOUND
CMake Error at CMakeLists.txt:32 (message):
LLVM_CONFIG-NOTFOUND failed

[jckarter]

You may need to use -DLLVM_CONFIG=/path/to/llvm-config to point cmake in the right direction.

[pmor13]

Joe, currently I have "llvm-config: command not found". One should install LLVM first, right?

[jckarter]

Yes, you'll need LLVM and Clang 3.2 installed before building Clay. Note that later versions of LLVM and Clang aren't source-compatible, so it has to be 3.2.

[pmor13]

Joe, it seems one needs an advice. I have on my OS X machine LLVM with Clang, that I have built one month ago. It is not finally installed, because I just played with it. All binaries are still in the build directory. Today I checked versions:
"./llvm-config --version" gives me "3.5svn"
"./clang --version" gives me "clang version 3.5 (trunk) Target: x86_64-apple-darwin13.2.0 Thread model: posix"

If I understand you correctly, I need to build LLVM with Clang ver. 3.2 and then install it. But by default I have Clang 5.1 (clang-503.0.40) (based on LLVM 3.4svn) on my machine. So, how I can use ver. 3.2 without override default installation to finally build Clay?

[jckarter]

LLVM and Clang installations can coexist in different locations. You should be able to install the 3.2 packages from http://llvm.org/releases/download.html#3.2 in, say, /usr/local/llvm-3.2, and point Clay's cmake config at /usr/local/llvm-3.2/bin/llvm-config, without disrupting your ToT installation.