Can't find python on OS X

[paro-]

Hello,

My project depends on s2geometry, but now that abseil was made external I can't compile anymore.

Indeed in my CMakeLists.txt I added add_subdirectory(third-party/abseil) before add_subdirectory(third-party/s2geometry) but s2 complained that it couldn't find abslConfig.cmake so I used set(ABSL_ENABLE_INSTALL ON) to have it, but now I'm stuck on the following error:
CMake Error at build/third-party/abseil-cpp/abslConfig.cmake:32 (include):
[cmake] include could not find load file:
[cmake]
[cmake] [...]/build/third-party/abseil-cpp/abslTargets.cmake
[cmake] Call Stack (most recent call first):
[cmake] third-party/s2geometry/CMakeLists.txt:71 (find_package)

The targets don't seem to be installed when add_subdirectory(third-party/abseil) finishes, when s2 launches find_package(absl REQUIRED).
Which brings me to my question: is there a way to compile abseil before s2 in the same CMake, or am I missing something here?

Best regards,
Paul

[jmr]

I haven't tried. What do the abseil docs say about how to do that?

[aliwo]

Same here... 😢

Environment

• MacOS Catalina 10.15.7
• cmake version 3.24.2

Output

cmake -DWITH_GFLAGS=ON -WITH_GTEST=ON \
-DGTEST_ROOT=/Users/.../sw_gtest/googletest-release-1.8.0 \
-DOPENSSL_INCLUDE_DIR=/usr/local/opt/openssl@1.1/include

CMake Warning:
  No source or binary directory provided.  Both will be assumed to be the
  same as the current working directory, but note that this warning will
  become a fatal error in future CMake releases.


-- The C compiler identification is AppleClang 12.0.0.12000032
-- The CXX compiler identification is AppleClang 12.0.0.12000032
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- The following features have been enabled:

 * GFLAGS, allows changing command line flags.
 * GLOG, provides logging configurability.
 * SHARED_LIBS, builds shared libraries instead of static.

-- The following features have been disabled:

 * PYTHON, provides python interface to S2

CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
  The package name passed to `find_package_handle_standard_args` (GLOG) does
  not match the name of the calling package (Glog).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  third_party/cmake/FindGlog.cmake:42 (find_package_handle_standard_args)
  CMakeLists.txt:51 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

output
-- Found GLOG: /usr/local/include
CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
  The package name passed to `find_package_handle_standard_args` (GFLAGS)
  does not match the name of the calling package (GFlags).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  third_party/cmake/FindGFlags.cmake:41 (find_package_handle_standard_args)
  CMakeLists.txt:64 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found GFLAGS: /usr/local/include
CMake Error at CMakeLists.txt:71 (find_package):
  By not providing "Findabsl.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "absl", but
  CMake did not find one.

  Could not find a package configuration file provided by "absl" with any of
  the following names:

    abslConfig.cmake
    absl-config.cmake

  Add the installation prefix of "absl" to CMAKE_PREFIX_PATH or set
  "absl_DIR" to a directory containing one of the above files.  If "absl"
  provides a separate development package or SDK, be sure it has been
  installed.


-- Configuring incomplete, errors occurred!
See also "/Users/.../s2geometry/CMakeFiles/CMakeOutput.log".

and plus, running cmake command inside build directory (which https://s2geometry.io/about/install guides tells us to) makes an error

(/Users/.../s2geometry/build) $ cmake -DWITH_GFLAGS=ON -WITH_GTEST=ON \
-DGTEST_ROOT=/Users/.../googletest-release-1.8.0 \
-DOPENSSL_INCLUDE_DIR=/usr/local/opt/openssl@1.1/include
cmake -DWITH_GFLAGS=ON -WITH_GTEST=ON \
-DGTEST_ROOT=/Users/.../googletest-release-1.8.0 \
-DOPENSSL_INCLUDE_DIR=/usr/local/opt/openssl@1.1/include
CMake Warning:
  No source or binary directory provided.  Both will be assumed to be the
  same as the current working directory, but note that this warning will
  become a fatal error in future CMake releases.


CMake Error: The source directory "/Users/.../build" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.

[jmr]

Same here... cry

Environment

• MacOS Catalina 10.15.7
• cmake version 3.24.2

Output

cmake -DWITH_GFLAGS=ON -WITH_GTEST=ON \
-DGTEST_ROOT=/Users/.../sw_gtest/googletest-release-1.8.0 \
-DOPENSSL_INCLUDE_DIR=/usr/local/opt/openssl@1.1/include

This is a separate issue, but I can see why it could appear similar.

You need to specify -DCMAKE_PREFIX_PATH=/path/to/absl/install like here: https://github.com/google/s2geometry#building

You can send a PR to update the Mac instructions after you get it working. You may also need a googletest newer than 1.8.0. See if you get errors from that.

[aliwo]

Thank you! I was able to make some progress.
hmm... I found something in the output.

first it finds python3
(Found Python3: /Library/Frameworks/Python.framework/Versions/3.10/bin/python3.10) but next it finds python2. (-- Found PythonInterp: /usr/bin/python (found version "2.7.16")) is there any way to specify python3 interpreter?

I tried python3 and import pywraps2 and it fails (ModuleNotFoundError)

Below is the full output.

cmake -DWITH_GFLAGS=ON \
-WITH_GTEST=ON \
-DGTEST_ROOT=/Users/.../sw_gtest/googletest-release-1.8.0 \
-DOPENSSL_INCLUDE_DIR=/usr/local/opt/openssl@1.1/include \
-DCMAKE_PREFIX_PATH=/usr/local/Cellar/abseil/20220623.1 \
-DCMAKE_POSITION_INDEPENDENT_CODE=ON \
-DWITH_PYTHON=ON
CMake Warning:
  No source or binary directory provided.  Both will be assumed to be the
  same as the current working directory, but note that this warning will
  become a fatal error in future CMake releases.


-- The C compiler identification is AppleClang 12.0.0.12000032
-- The CXX compiler identification is AppleClang 12.0.0.12000032
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- The following features have been enabled:

 * GFLAGS, allows changing command line flags.
 * GLOG, provides logging configurability.
 * SHARED_LIBS, builds shared libraries instead of static.
 * PYTHON, provides python interface to S2

CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
  The package name passed to `find_package_handle_standard_args` (GLOG) does
  not match the name of the calling package (Glog).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  third_party/cmake/FindGlog.cmake:42 (find_package_handle_standard_args)
  CMakeLists.txt:51 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found GLOG: /usr/local/include
CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
  The package name passed to `find_package_handle_standard_args` (GFLAGS)
  does not match the name of the calling package (GFlags).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  third_party/cmake/FindGFlags.cmake:41 (find_package_handle_standard_args)
  CMakeLists.txt:64 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found GFLAGS: /usr/local/include
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Found OpenSSL: /usr/local/lib/libcrypto.dylib (found version "1.1.1n")
-- Found SWIG: /usr/local/bin/swig (found suitable version "4.0.2", minimum required is "4.0")
-- Found Python3: /Library/Frameworks/Python.framework/Versions/3.10/bin/python3.10 (found version "3.10.4") found components: Interpreter Development Development.Module Development.Embed
GTEST_ROOT: /Users/.../sw_gtest/googletest-release-1.8.0
CMake Deprecation Warning at /Users/.../sw_gtest/googletest-release-1.8.0/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


CMake Warning (dev) at /Users/.../sw_gtest/googletest-release-1.8.0/CMakeLists.txt:3 (project):
  Policy CMP0048 is not set: project() command manages VERSION variables.
  Run "cmake --help-policy CMP0048" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.

  The following variable(s) would be set to empty:

    PROJECT_VERSION
    PROJECT_VERSION_MAJOR
    PROJECT_VERSION_MINOR
    PROJECT_VERSION_PATCH
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at /Users/.../sw_gtest/googletest-release-1.8.0/googlemock/CMakeLists.txt:40 (project):
  Policy CMP0048 is not set: project() command manages VERSION variables.
  Run "cmake --help-policy CMP0048" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.

  The following variable(s) would be set to empty:

    PROJECT_VERSION
    PROJECT_VERSION_MAJOR
    PROJECT_VERSION_MINOR
    PROJECT_VERSION_PATCH
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Deprecation Warning at /Users/.../sw_gtest/googletest-release-1.8.0/googlemock/CMakeLists.txt:41 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


CMake Warning (dev) at /Users/.../sw_gtest/googletest-release-1.8.0/googletest/CMakeLists.txt:47 (project):
  Policy CMP0048 is not set: project() command manages VERSION variables.
  Run "cmake --help-policy CMP0048" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.

  The following variable(s) would be set to empty:

    PROJECT_VERSION
    PROJECT_VERSION_MAJOR
    PROJECT_VERSION_MINOR
    PROJECT_VERSION_PATCH
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Deprecation Warning at /Users/.../sw_gtest/googletest-release-1.8.0/googletest/CMakeLists.txt:48 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Found PythonInterp: /usr/bin/python (found version "2.7.16")
CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/UseSWIG.cmake:775 (message):
  Policy CMP0078 is not set: UseSWIG generates standard target names.  Run
  "cmake --help-policy CMP0078" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.

Call Stack (most recent call first):
  src/python/CMakeLists.txt:8 (swig_add_library)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/UseSWIG.cmake:617 (message):
  Policy CMP0086 is not set: UseSWIG honors SWIG_MODULE_NAME via -module
  flag.  Run "cmake --help-policy CMP0086" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

Call Stack (most recent call first):
  /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/UseSWIG.cmake:888 (SWIG_ADD_SOURCE_TO_MODULE)
  src/python/CMakeLists.txt:8 (swig_add_library)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Configuring done
-- Generating done
-- Build files have been written to: /Users/.../PycharmProjects/s2geometry