"Found gtest sources under '/usr/src/googletest': gtests will be built" but message(STATUS ${GTEST_INCLUDE_DIRS}) print '/usr/include'

[osjacky430]

Platform version information:

• ROS: melodic
• Ubuntu distro: 18.04
• catkin version: 0.7.29
• cmake version: 3.21.1

gtest version:

• libgtest-dev, version: 1.10.0-2~18.04.sav0
• googletest, versoin: 1.10.0-2~18.04.sav0
• no googletest or gtest under catkin workspace

Minimum reproducible example:

under catkin workspace source directory

catkin_create_pkg catkin_issue

modify top-level CMakeLists.txt (comments removed)

cmake_minimum_required(VERSION 3.0.2)
project(catkin_issue)

find_package(catkin REQUIRED)

message(STATUS "GTEST_LIBRARIES: " ${GTEST_LIBRARIES})
message(STATUS "GTEST_FROM_SOURCE_LIBRARY_DIRS: " ${GTEST_FROM_SOURCE_LIBRARY_DIRS})
message(STATUS "GTEST_FROM_SOURCE_INCLUDE_DIRS: " ${GTEST_FROM_SOURCE_INCLUDE_DIRS})
message(STATUS "GTEST INCLUDE DIRS: " ${GTEST_INCLUDE_DIRS})
message(STATUS "GMOCK INCLUDE DIRS: " ${GMOCK_INCLUDE_DIRS})

catkin_package()
include_directories()

Build

source /opt/ros/melodic/setup.bash
catkin clean --yes
catkin build catkin_issue -v

Result

--------------------------------------------------------------
Profile:                     default
Extending:             [env] /opt/ros/melodic
Workspace:                   /home/gyro/Desktop/catkin
--------------------------------------------------------------
Build Space:        [exists] /home/gyro/Desktop/catkin/build
Devel Space:        [exists] /home/gyro/Desktop/catkin/devel
Install Space:      [unused] /home/gyro/Desktop/catkin/install
Log Space:         [missing] /home/gyro/Desktop/catkin/logs
Source Space:       [exists] /home/gyro/Desktop/catkin/src
DESTDIR:            [unused] None
--------------------------------------------------------------
Devel Space Layout:          linked
Install Space Layout:        None
--------------------------------------------------------------
Additional CMake Args:       None
Additional Make Args:        None
Additional catkin Make Args: None
Internal Make Job Server:    True
Cache Job Environments:      False
--------------------------------------------------------------
Whitelisted Packages:        None
Blacklisted Packages:        None
--------------------------------------------------------------
Workspace configuration appears valid.

NOTE: Forcing CMake to run for each package.
--------------------------------------------------------------
[build] Found '27' packages in 0.0 seconds.                                                                                                                                                  
[build] Updating package table.                                                                                                                                                              
Starting  >>> catkin_tools_prebuild                                                                                                                                                          
Starting   >> catkin_tools_prebuild:loadenv                                                                                                                                                  
Output     << catkin_tools_prebuild:loadenv /home/gyro/Desktop/catkin/logs/catkin_tools_prebuild/build.loadenv.000.log                                                                       
Loading environment from: /home/gyro/Desktop/catkin/devel/env.sh
Finished   << catkin_tools_prebuild:loadenv                                                                                                                                                  
Starting   >> catkin_tools_prebuild:mkdir                                                                                                                                                    
Starting   >> catkin_tools_prebuild:mkdir                                                                                                                                                    
Starting   >> catkin_tools_prebuild:cache-manifest                                                                                                                                           
Starting   >> catkin_tools_prebuild:ctr-nuke                                                                                                                                                 
Starting   >> catkin_tools_prebuild:cmake                                                                                                                                                    
Subprocess  > catkin_tools_prebuild:cmake `cd /home/gyro/Desktop/catkin/build/catkin_tools_prebuild; catkin build --get-env catkin_tools_prebuild | catkin env -si  /usr/local/bin/cmake /home/gyro/Desktop/catkin/build/catkin_tools_prebuild --no-warn-unused-cli -DCATKIN_DEVEL_PREFIX=/home/gyro/Desktop/catkin/devel/.private/catkin_tools_prebuild -DCMAKE_INSTALL_PREFIX=/home/gyro/Desktop/catkin/install; cd -`
_____________________________________________________________________________________________________________________________________________________________________________________________
Warnings   << catkin_tools_prebuild:cmake /home/gyro/Desktop/catkin/logs/catkin_tools_prebuild/build.cmake.000.log                                                                           
Not searching for unused variables given on the command line.
Re-run cmake no build system arguments
CMake Deprecation Warning at 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.


-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /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: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Using CATKIN_DEVEL_PREFIX: /home/gyro/Desktop/catkin/devel/.private/catkin_tools_prebuild
-- Using CMAKE_PREFIX_PATH: /opt/ros/melodic
-- This workspace overlays: /opt/ros/melodic
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.18", minimum required is "2")
-- Using PYTHON_EXECUTABLE: /usr/bin/python2
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/gyro/Desktop/catkin/build/catkin_tools_prebuild/test_results
-- Forcing gtest/gmock from source, though one was otherwise available.
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
CMake Deprecation Warning at /usr/src/googletest/CMakeLists.txt:4 (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 Deprecation Warning at /usr/src/googletest/googlemock/CMakeLists.txt:45 (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 Deprecation Warning at /usr/src/googletest/googletest/CMakeLists.txt:56 (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/python2 (found version "2.7.18")
-- Found Threads: TRUE
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.7.29
-- BUILD_SHARED_LIBS is on
-- Configuring done
-- Generating done
-- Build files have been written to: /home/gyro/Desktop/catkin/build/catkin_tools_prebuild
cd /home/gyro/Desktop/catkin/build/catkin_tools_prebuild; catkin build --get-env catkin_tools_prebuild | catkin env -si  /usr/local/bin/cmake /home/gyro/Desktop/catkin/build/catkin_tools_prebuild --no-warn-unused-cli -DCATKIN_DEVEL_PREFIX=/home/gyro/Desktop/catkin/devel/.private/catkin_tools_prebuild -DCMAKE_INSTALL_PREFIX=/home/gyro/Desktop/catkin/install; cd -
.............................................................................................................................................................................................
Finished   << catkin_tools_prebuild:cmake                                                                                                                                                    
Starting   >> catkin_tools_prebuild:make                                                                                                                                                     
Subprocess  > catkin_tools_prebuild:make `cd /home/gyro/Desktop/catkin/build/catkin_tools_prebuild; catkin build --get-env catkin_tools_prebuild | catkin env -si  /usr/bin/make --jobserver-fds=6,7 -j; cd -`
Output     << catkin_tools_prebuild:make /home/gyro/Desktop/catkin/logs/catkin_tools_prebuild/build.make.000.log                                                                             
/usr/local/bin/cmake -S/home/gyro/Desktop/catkin/build/catkin_tools_prebuild -B/home/gyro/Desktop/catkin/build/catkin_tools_prebuild --check-build-system CMakeFiles/Makefile.cmake 0
/usr/local/bin/cmake -E cmake_progress_start /home/gyro/Desktop/catkin/build/catkin_tools_prebuild/CMakeFiles /home/gyro/Desktop/catkin/build/catkin_tools_prebuild//CMakeFiles/progress.marks
/usr/bin/make  -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/home/gyro/Desktop/catkin/build/catkin_tools_prebuild'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/gyro/Desktop/catkin/build/catkin_tools_prebuild'
/usr/local/bin/cmake -E cmake_progress_start /home/gyro/Desktop/catkin/build/catkin_tools_prebuild/CMakeFiles 0
cd /home/gyro/Desktop/catkin/build/catkin_tools_prebuild; catkin build --get-env catkin_tools_prebuild | catkin env -si  /usr/bin/make --jobserver-fds=6,7 -j; cd -
Finished   << catkin_tools_prebuild:make                                                                                                                                                     
Starting   >> catkin_tools_prebuild:symlink                                                                                                                                                  
Output     << catkin_tools_prebuild:symlink /home/gyro/Desktop/catkin/logs/catkin_tools_prebuild/build.symlink.000.log                                                                       
Symlinking /home/gyro/Desktop/catkin/devel/./env.sh
Symlinking /home/gyro/Desktop/catkin/devel/./local_setup.zsh
Symlinking /home/gyro/Desktop/catkin/devel/./cmake.lock
Symlinking /home/gyro/Desktop/catkin/devel/./local_setup.sh
Symlinking /home/gyro/Desktop/catkin/devel/./_setup_util.py
Symlinking /home/gyro/Desktop/catkin/devel/./local_setup.bash
Symlinking /home/gyro/Desktop/catkin/devel/./setup.sh
Symlinking /home/gyro/Desktop/catkin/devel/./setup.zsh
Symlinking /home/gyro/Desktop/catkin/devel/./setup.bash
Symlinking /home/gyro/Desktop/catkin/devel/share/catkin_tools_prebuild/cmake/catkin_tools_prebuildConfig-version.cmake
Symlinking /home/gyro/Desktop/catkin/devel/share/catkin_tools_prebuild/cmake/catkin_tools_prebuildConfig.cmake
Symlinking /home/gyro/Desktop/catkin/devel/lib/pkgconfig/catkin_tools_prebuild.pc
Finished   << catkin_tools_prebuild:symlink                                                                                                                                                  
Finished  <<< catkin_tools_prebuild                [ 0.8 seconds ]                                                                                                                           
Starting  >>> catkin_issue                                                                                                                                                                   
Starting   >> catkin_issue:loadenv                                                                                                                                                           
Output     << catkin_issue:loadenv /home/gyro/Desktop/catkin/logs/catkin_issue/build.loadenv.000.log                                                                                         
Loading environment from: /home/gyro/Desktop/catkin/devel/env.sh
Finished   << catkin_issue:loadenv                                                                                                                                                           
Starting   >> catkin_issue:mkdir                                                                                                                                                             
Starting   >> catkin_issue:mkdir                                                                                                                                                             
Starting   >> catkin_issue:cache-manifest                                                                                                                                                    
Starting   >> catkin_issue:ctr-nuke                                                                                                                                                          
Starting   >> catkin_issue:cmake                                                                                                                                                             
Subprocess  > catkin_issue:cmake `cd /home/gyro/Desktop/catkin/build/catkin_issue; catkin build --get-env catkin_issue | catkin env -si  /usr/local/bin/cmake /home/gyro/Desktop/catkin/src/catkin_issue --no-warn-unused-cli -DCATKIN_DEVEL_PREFIX=/home/gyro/Desktop/catkin/devel/.private/catkin_issue -DCMAKE_INSTALL_PREFIX=/home/gyro/Desktop/catkin/install; cd -`
_____________________________________________________________________________________________________________________________________________________________________________________________
Warnings   << catkin_issue:cmake /home/gyro/Desktop/catkin/logs/catkin_issue/build.cmake.000.log                                                                                             
Not searching for unused variables given on the command line.
Re-run cmake no build system arguments
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /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: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Using CATKIN_DEVEL_PREFIX: /home/gyro/Desktop/catkin/devel/.private/catkin_issue
-- Using CMAKE_PREFIX_PATH: /home/gyro/Desktop/catkin/devel;/opt/ros/melodic
-- This workspace overlays: /home/gyro/Desktop/catkin/devel;/opt/ros/melodic
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.18", minimum required is "2")
-- Using PYTHON_EXECUTABLE: /usr/bin/python2
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/gyro/Desktop/catkin/build/catkin_issue/test_results
-- Forcing gtest/gmock from source, though one was otherwise available.
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
CMake Deprecation Warning at /usr/src/googletest/CMakeLists.txt:4 (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 Deprecation Warning at /usr/src/googletest/googlemock/CMakeLists.txt:45 (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 Deprecation Warning at /usr/src/googletest/googletest/CMakeLists.txt:56 (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/python2 (found version "2.7.18")
-- Found Threads: TRUE
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.7.29
-- BUILD_SHARED_LIBS is on
-- GTEST_LIBRARIES: gtest
-- GTEST_FROM_SOURCE_LIBRARY_DIRS: /home/gyro/Desktop/catkin/build/catkin_issue/gtest
-- GTEST_FROM_SOURCE_INCLUDE_DIRS: /usr/include
-- GTEST INCLUDE DIRS: /usr/include
-- GMOCK INCLUDE DIRS: /usr/src/googletest/googlemock/include
-- Configuring done
-- Generating done
-- Build files have been written to: /home/gyro/Desktop/catkin/build/catkin_issue
cd /home/gyro/Desktop/catkin/build/catkin_issue; catkin build --get-env catkin_issue | catkin env -si  /usr/local/bin/cmake /home/gyro/Desktop/catkin/src/catkin_issue --no-warn-unused-cli -DCATKIN_DEVEL_PREFIX=/home/gyro/Desktop/catkin/devel/.private/catkin_issue -DCMAKE_INSTALL_PREFIX=/home/gyro/Desktop/catkin/install; cd -
.............................................................................................................................................................................................
Finished   << catkin_issue:cmake                                                                                                                                                             
Starting   >> catkin_issue:make                                                                                                                                                              
Subprocess  > catkin_issue:make `cd /home/gyro/Desktop/catkin/build/catkin_issue; catkin build --get-env catkin_issue | catkin env -si  /usr/bin/make --jobserver-fds=6,7 -j; cd -`          
Output     << catkin_issue:make /home/gyro/Desktop/catkin/logs/catkin_issue/build.make.000.log                                                                                               
/usr/local/bin/cmake -S/home/gyro/Desktop/catkin/src/catkin_issue -B/home/gyro/Desktop/catkin/build/catkin_issue --check-build-system CMakeFiles/Makefile.cmake 0
/usr/local/bin/cmake -E cmake_progress_start /home/gyro/Desktop/catkin/build/catkin_issue/CMakeFiles /home/gyro/Desktop/catkin/build/catkin_issue//CMakeFiles/progress.marks
/usr/bin/make  -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/home/gyro/Desktop/catkin/build/catkin_issue'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/gyro/Desktop/catkin/build/catkin_issue'
/usr/local/bin/cmake -E cmake_progress_start /home/gyro/Desktop/catkin/build/catkin_issue/CMakeFiles 0
cd /home/gyro/Desktop/catkin/build/catkin_issue; catkin build --get-env catkin_issue | catkin env -si  /usr/bin/make --jobserver-fds=6,7 -j; cd -
Finished   << catkin_issue:make                                                                                                                                                              
Starting   >> catkin_issue:symlink                                                                                                                                                           
Output     << catkin_issue:symlink /home/gyro/Desktop/catkin/logs/catkin_issue/build.symlink.000.log                                                                                         
Symlinking /home/gyro/Desktop/catkin/devel/share/catkin_issue/cmake/catkin_issueConfig.cmake
Symlinking /home/gyro/Desktop/catkin/devel/share/catkin_issue/cmake/catkin_issueConfig-version.cmake
Symlinking /home/gyro/Desktop/catkin/devel/lib/pkgconfig/catkin_issue.pc
Finished   << catkin_issue:symlink                                                                                                                                                           
Finished  <<< catkin_issue                         [ 0.9 seconds ]                                                                                                                           
[build] Summary: All 2 packages succeeded!                                                                                                                                                   
[build]   Ignored:   26 packages were skipped or are blacklisted.                                                                                                                            
[build]   Warnings:  2 packages succeeded with warnings.                                                                                                                                     
[build]   Abandoned: None.                                                                                                                                                                   
[build]   Failed:    None.                                                                                                                                                                   
[build] Runtime: 1.7 seconds total.

It looks like a bug to me, due to this, I need to manually specify the path to googletest instead of ${GTEST_INCLUDE_DIRS} when running CPPCheck in order to suppress warning from it.

After digging into the source code, it seems that catkin assume libgtest-dev's header at /usr/include and source at /usr/src/gtest. However, ls -l under /usr/src I found that /usr/src/gtest is symlinked to googletest, so base_dir will always point to /usr/src/googletest, thus the message `Found gtest sources under '/usr/src/googletest''.

As for gmock, since libgmock-dev isn't installed, GMock related paths are shown as expected. If libgmock-dev is installed, same thing happens to GMock as well. (verified)

Perhaps re-setting gtest_<VAR> in here is the right way to fix the issue?

catkin/cmake/test/gtest.cmake

Lines 307 to 313 in 085e895

	if(_gtest_found)
	get_filename_component(_gtest_base_dir_realpath ${_gtest_base_dir} REALPATH)
	get_filename_component(_global_base_dir ${_gtest_base_dir_realpath} PATH)
	if(EXISTS "${_global_base_dir}/CMakeLists.txt")
	set(${base_dir} ${_global_base_dir} PARENT_SCOPE)
	endif()
	endif()