llvm dev - Feb 2020 - cmake finishes OK for all the projects except debuginfo-tests.

cmake -G Ninja -DLLVM_ENABLE_PROJECTS="debuginfo-tests" 
-DLLVM_USE_LINKER=lld -DCMAKE_BUILD_TYPE="Release" 
-DLLVM_TARGETS_TO_BUILD=X86 -Wno-dev ../llvm &> ../../cmake.log

in cmake.log
-- Targeting X86
CMake Error at 
/home/nnelson/Documents/llvm-project/debuginfo-tests/CMakeLists.txt:30 
(message):
   Cannot run debuginfo-tests without python 3

installed
python3 --version
Python 3.7.5

python --version
Python 2.7.17

in llvm-project/debuginfo-tests/CMakeLists.txt
elseif(PYTHON_VERSION_MAJOR LESS 3)
   message(FATAL_ERROR "Cannot run debuginfo-tests without python 3")

Neil Nelson
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Hi Neil,

CMake is using whatever "python" is, which is Python2 for me so I get
the same error.

You can specify the Python exe directly[0] by adding this:
-DPYTHON_EXECUTABLE=`which python3`

That gets you to:
CMake Error at
/work/open_source/llvm-project/llvm/cmake/modules/AddLLVM.cmake:1543
(add_dependencies):
  The dependency target "clang" of target "check-debuginfo"
does not exist.

To fix that you can just add "clang" to LLVM_ENABLE_PROJECTS.

There is a specific FindPython3 module [1] that debuginfo-tests could use but
I'm not sure if it's available in the minimum CMake version we require.

Thanks,
David Spickett.

[0] https://cmake.org/cmake/help/v3.0/module/FindPythonInterp.html
[1] https://cmake.org/cmake/help/v3.12/module/FindPython3.html

________________________________
From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Neil
Nelson via llvm-dev <llvm-dev at lists.llvm.org>
Sent: 16 February 2020 02:42
To: llvm-dev at lists.llvm.org <llvm-dev at lists.llvm.org>
Subject: [llvm-dev] cmake finishes OK for all the projects except
debuginfo-tests.

cmake -G Ninja -DLLVM_ENABLE_PROJECTS="debuginfo-tests"
-DLLVM_USE_LINKER=lld -DCMAKE_BUILD_TYPE="Release"
-DLLVM_TARGETS_TO_BUILD=X86 -Wno-dev ../llvm &> ../../cmake.log

in cmake.log
-- Targeting X86
CMake Error at
/home/nnelson/Documents/llvm-project/debuginfo-tests/CMakeLists.txt:30
(message):
  Cannot run debuginfo-tests without python 3

installed
python3 --version
Python 3.7.5

python --version
Python 2.7.17

in llvm-project/debuginfo-tests/CMakeLists.txt
elseif(PYTHON_VERSION_MAJOR LESS 3)
  message(FATAL_ERROR "Cannot run debuginfo-tests without python 3")

Neil Nelson
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Could one of you please file a bug? and mention the helpful references. 
We'd really like this experience to be smooth, and debuginfo-tests as it
exists really supports only Python 3.
Thanks,
--paulr

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of David
Spickett via llvm-dev
Sent: Monday, February 17, 2020 4:39 AM
To: llvm-dev at lists.llvm.org; Neil Nelson <nnelson at infowest.com>
Subject: Re: [llvm-dev] cmake finishes OK for all the projects except
debuginfo-tests.

Hi Neil,

CMake is using whatever "python" is, which is Python2 for me so I get
the same error.

You can specify the Python exe directly[0] by adding this:
-DPYTHON_EXECUTABLE=`which python3`

That gets you to:
CMake Error at
/work/open_source/llvm-project/llvm/cmake/modules/AddLLVM.cmake:1543
(add_dependencies):
  The dependency target "clang" of target "check-debuginfo"
does not exist.

To fix that you can just add "clang" to LLVM_ENABLE_PROJECTS.

There is a specific FindPython3 module [1] that debuginfo-tests could use but
I'm not sure if it's available in the minimum CMake version we require.

Thanks,
David Spickett.

[0] https://cmake.org/cmake/help/v3.0/module/FindPythonInterp.html
[1] https://cmake.org/cmake/help/v3.12/module/FindPython3.html

________________________________
From: llvm-dev <llvm-dev-bounces at lists.llvm.org<mailto:llvm-dev-bounces
at lists.llvm.org>> on behalf of Neil Nelson via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
Sent: 16 February 2020 02:42
To: llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
<llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
Subject: [llvm-dev] cmake finishes OK for all the projects except
debuginfo-tests.

cmake -G Ninja -DLLVM_ENABLE_PROJECTS="debuginfo-tests"
-DLLVM_USE_LINKER=lld -DCMAKE_BUILD_TYPE="Release"
-DLLVM_TARGETS_TO_BUILD=X86 -Wno-dev ../llvm &> ../../cmake.log

in cmake.log
-- Targeting X86
CMake Error at
/home/nnelson/Documents/llvm-project/debuginfo-tests/CMakeLists.txt:30
(message):
  Cannot run debuginfo-tests without python 3

installed
python3 --version
Python 3.7.5

python --version
Python 2.7.17

in llvm-project/debuginfo-tests/CMakeLists.txt
elseif(PYTHON_VERSION_MAJOR LESS 3)
  message(FATAL_ERROR "Cannot run debuginfo-tests without python 3")

Neil Nelson
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