llvm dev - Nov 2018 - LLVM_CONFIG_PATH when building Clang from sources

I'm trying to build LLVM, CFE and RT from sources on an old PowerMac
with OS X 10.5.

After download and unpack into LLVM_SOURCE_DIR (with
--strip-components=1), I configure with:

    cmake -DCMAKE_INSTALL_PREFIX="/opt/llvm" \
        -DLLVM_TARGETS_TO_BUILD="PowerPC" \
        -DLLVM_INCLUDE_TOOLS="ON" \
        -DLLVM_BUILD_TESTS="ON"
        "$LLVM_SOURCE_DIR"

It results in "llvm-config not found: specify LLVM_CONFIG_PATH". The
docs at https://llvm.org/docs/CMake.html don't appear to discuss
LLVM_CONFIG_PATH.

I'm building out-of-tree with these two variables:

    LLVM_SOURCE_DIR="$HOME/llvm_source"
    LLVM_BUILD_DIR="$HOME/llvm_build"

How should I fix the LLVM_CONFIG_PATH error?

Thanks in advance.

=============================
-- The C compiler identification is GNU 4.0.1
-- The CXX compiler identification is GNU 4.0.1
-- The ASM compiler identification is GNU
-- Found assembler: /Developer/usr/bin/cc
-- Checking whether C compiler has -isysroot
-- Checking whether C compiler has -isysroot - yes
-- Checking whether C compiler supports OSX deployment target flag
-- Checking whether C compiler supports OSX deployment target flag - yes
-- Check for working C compiler: /Developer/usr/bin/cc
-- Check for working C compiler: /Developer/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Checking whether CXX compiler has -isysroot
-- Checking whether CXX compiler has -isysroot - yes
-- Checking whether CXX compiler supports OSX deployment target flag
-- Checking whether CXX compiler supports OSX deployment target flag - yes
-- Check for working CXX compiler: /Developer/usr/bin/c++
-- Check for working CXX compiler: /Developer/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for unwind.h
-- Looking for unwind.h - found
CMake Error at cmake/Modules/CompilerRTUtils.cmake:213 (message):
  llvm-config not found: specify LLVM_CONFIG_PATH
Call Stack (most recent call first):
  CMakeLists.txt:66 (load_llvm_config)

-- Configuring incomplete, errors occurred!

On 11/15/2018 09:39 PM, Jeffrey Walton via llvm-dev
wrote:
> I'm trying to build LLVM, CFE and RT from sources on an old PowerMac
> with OS X 10.5.
> 
Which version of clang/llvm are you using?

-Tom
> After download and unpack into LLVM_SOURCE_DIR (with
> --strip-components=1), I configure with:
> 
>     cmake -DCMAKE_INSTALL_PREFIX="/opt/llvm" \
>         -DLLVM_TARGETS_TO_BUILD="PowerPC" \
>         -DLLVM_INCLUDE_TOOLS="ON" \
>         -DLLVM_BUILD_TESTS="ON"
>         "$LLVM_SOURCE_DIR"
> 
> It results in "llvm-config not found: specify LLVM_CONFIG_PATH".
The
> docs at https://llvm.org/docs/CMake.html don't appear to discuss
> LLVM_CONFIG_PATH.
> 
> I'm building out-of-tree with these two variables:
> 
>     LLVM_SOURCE_DIR="$HOME/llvm_source"
>     LLVM_BUILD_DIR="$HOME/llvm_build"
> 
> How should I fix the LLVM_CONFIG_PATH error?
> 
> Thanks in advance.
> 
> =============================> 
> -- The C compiler identification is GNU 4.0.1
> -- The CXX compiler identification is GNU 4.0.1
> -- The ASM compiler identification is GNU
> -- Found assembler: /Developer/usr/bin/cc
> -- Checking whether C compiler has -isysroot
> -- Checking whether C compiler has -isysroot - yes
> -- Checking whether C compiler supports OSX deployment target flag
> -- Checking whether C compiler supports OSX deployment target flag - yes
> -- Check for working C compiler: /Developer/usr/bin/cc
> -- Check for working C compiler: /Developer/usr/bin/cc -- works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - done
> -- Detecting C compile features
> -- Detecting C compile features - done
> -- Checking whether CXX compiler has -isysroot
> -- Checking whether CXX compiler has -isysroot - yes
> -- Checking whether CXX compiler supports OSX deployment target flag
> -- Checking whether CXX compiler supports OSX deployment target flag - yes
> -- Check for working CXX compiler: /Developer/usr/bin/c++
> -- Check for working CXX compiler: /Developer/usr/bin/c++ -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Detecting CXX compile features
> -- Detecting CXX compile features - done
> -- Looking for unwind.h
> -- Looking for unwind.h - found
> CMake Error at cmake/Modules/CompilerRTUtils.cmake:213 (message):
>   llvm-config not found: specify LLVM_CONFIG_PATH
> Call Stack (most recent call first):
>   CMakeLists.txt:66 (load_llvm_config)
> 
> -- Configuring incomplete, errors occurred!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

On Fri, Nov 16, 2018 at 12:46 AM Tom Stellard <tstellar at redhat.com>
wrote:
>
> On 11/15/2018 09:39 PM, Jeffrey Walton via llvm-dev wrote:
> > I'm trying to build LLVM, CFE and RT from sources on an old
PowerMac
> > with OS X 10.5.
>
> Which version of clang/llvm are you using?
LLVM 7.0.

The script is available at
https://github.com/noloader/build-llvm/blob/master/build-llvm.sh

Jeff