Regression: cmake fails when libgtest-dev is installed but libgmock-dev is not

[nurupo]

v0.2.18 succeeds

$ sudo docker run -it --rm debian:bookworm /bin/bash
$ BRANCH=v0.2.18
$ apt-get update && apt-get install -y cmake g++ gcc git libgtest-dev libopus-dev libsodium-dev libvpx-dev pkg-config
$ git clone --recursive --branch $BRANCH https://github.com/TokTok/c-toxcore
$ cd c-toxcore
$ cmake -B_build
-- The C compiler identification is GNU 12.2.0
-- The CXX compiler identification is GNU 12.2.0
-- 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
SOVERSION: 2.18.0
-- Found PkgConfig: /usr/bin/pkg-config (found version "1.8.1") 
-- Supported C compiler features = c_std_90;c_function_prototypes;c_std_99;c_restrict;c_variadic_macros;c_std_11;c_static_assert;c_std_17;c_std_23
-- Supported C++ compiler features = cxx_std_98;cxx_template_template_parameters;cxx_std_11;cxx_alias_templates;cxx_alignas;cxx_alignof;cxx_attributes;cxx_auto_type;cxx_constexpr;cxx_decltype;cxx_decltype_incomplete_return_types;cxx_default_function_template_args;cxx_defaulted_functions;cxx_defaulted_move_initializers;cxx_delegating_constructors;cxx_deleted_functions;cxx_enum_forward_declarations;cxx_explicit_conversions;cxx_extended_friend_declarations;cxx_extern_templates;cxx_final;cxx_func_identifier;cxx_generalized_initializers;cxx_inheriting_constructors;cxx_inline_namespaces;cxx_lambdas;cxx_local_type_template_args;cxx_long_long_type;cxx_noexcept;cxx_nonstatic_member_init;cxx_nullptr;cxx_override;cxx_range_for;cxx_raw_string_literals;cxx_reference_qualified_functions;cxx_right_angle_brackets;cxx_rvalue_references;cxx_sizeof_member;cxx_static_assert;cxx_strong_enums;cxx_thread_local;cxx_trailing_return_types;cxx_unicode_literals;cxx_uniform_initialization;cxx_unrestricted_unions;cxx_user_literals;cxx_variadic_macros;cxx_variadic_templates;cxx_std_14;cxx_aggregate_default_initializers;cxx_attribute_deprecated;cxx_binary_literals;cxx_contextual_conversions;cxx_decltype_auto;cxx_digit_separators;cxx_generic_lambdas;cxx_lambda_init_captures;cxx_relaxed_constexpr;cxx_return_type_deduction;cxx_variable_templates;cxx_std_17;cxx_std_20;cxx_std_23
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Checking for one of the modules 'libsodium'
-- Checking for one of the modules 'opus'
-- Checking for one of the modules 'vpx'
-- Checking for one of the modules 'libconfig'
CMAKE_THREAD_LIBS_INIT: 
-- Checking for gtest
-- Looking for C++ include gtest/gtest.h
-- Looking for C++ include gtest/gtest.h - found
-- Found gtest: /usr/src/gtest
-- Performing Test HAVE_CXX_W
-- Performing Test HAVE_CXX_W - Success
-- Performing Test HAVE_CXX_W_NO_GLOBAL_CONSTRUCTORS
-- Performing Test HAVE_CXX_W_NO_GLOBAL_CONSTRUCTORS - Success
-- Performing Test HAVE_CXX_W_NO_ZERO_AS_NULL_POINTER_CONSTANT
-- Performing Test HAVE_CXX_W_NO_ZERO_AS_NULL_POINTER_CONSTANT - Success
CMake Warning at CMakeLists.txt:456 (message):
  Option BOOTSTRAP_DAEMON is enabled but required library LIBCONFIG was not
  found.


-- Configuring done
-- Generating done
-- Build files have been written to: /c-toxcore/_build

master fails

$ sudo docker run -it --rm debian:bookworm /bin/bash
$ BRANCH=master
$ apt-get update && apt-get install -y cmake g++ gcc git libgtest-dev libopus-dev libsodium-dev libvpx-dev pkg-config
$ git clone --recursive --branch $BRANCH https://github.com/TokTok/c-toxcore
$ cd c-toxcore
$ cmake -B_build
-- The C compiler identification is GNU 12.2.0
-- The CXX compiler identification is GNU 12.2.0
-- 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
SOVERSION: 2.18.0
-- Found GTest: /usr/lib/x86_64-linux-gnu/cmake/GTest/GTestConfig.cmake (found version "1.12.1")  
-- Supported C compiler features = c_std_90;c_function_prototypes;c_std_99;c_restrict;c_variadic_macros;c_std_11;c_static_assert;c_std_17;c_std_23
-- Supported C++ compiler features = cxx_std_98;cxx_template_template_parameters;cxx_std_11;cxx_alias_templates;cxx_alignas;cxx_alignof;cxx_attributes;cxx_auto_type;cxx_constexpr;cxx_decltype;cxx_decltype_incomplete_return_types;cxx_default_function_template_args;cxx_defaulted_functions;cxx_defaulted_move_initializers;cxx_delegating_constructors;cxx_deleted_functions;cxx_enum_forward_declarations;cxx_explicit_conversions;cxx_extended_friend_declarations;cxx_extern_templates;cxx_final;cxx_func_identifier;cxx_generalized_initializers;cxx_inheriting_constructors;cxx_inline_namespaces;cxx_lambdas;cxx_local_type_template_args;cxx_long_long_type;cxx_noexcept;cxx_nonstatic_member_init;cxx_nullptr;cxx_override;cxx_range_for;cxx_raw_string_literals;cxx_reference_qualified_functions;cxx_right_angle_brackets;cxx_rvalue_references;cxx_sizeof_member;cxx_static_assert;cxx_strong_enums;cxx_thread_local;cxx_trailing_return_types;cxx_unicode_literals;cxx_uniform_initialization;cxx_unrestricted_unions;cxx_user_literals;cxx_variadic_macros;cxx_variadic_templates;cxx_std_14;cxx_aggregate_default_initializers;cxx_attribute_deprecated;cxx_binary_literals;cxx_contextual_conversions;cxx_decltype_auto;cxx_digit_separators;cxx_generic_lambdas;cxx_lambda_init_captures;cxx_relaxed_constexpr;cxx_return_type_deduction;cxx_variable_templates;cxx_std_17;cxx_std_20;cxx_std_23
-- Found PkgConfig: /usr/bin/pkg-config (found version "1.8.1") 
-- Found Threads: TRUE  
-- Checking for one of the modules 'libsodium'
-- Checking for one of the modules 'opus'
-- Checking for one of the modules 'vpx'
-- Checking for one of the modules 'libconfig'
CMAKE_THREAD_LIBS_INIT: 
CMake Warning at CMakeLists.txt:590 (message):
  Option BOOTSTRAP_DAEMON is enabled but required library LIBCONFIG was not                                                                                       
  found.                                                                                                                                                          


-- Configuring done
CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_ring_buffer_test" links to:                                                                                                                        

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:531 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_rtp_test" links to:                                                                                                                                

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:532 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_DHT_test" links to:                                                                                                                                

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:533 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_bin_pack_test" links to:                                                                                                                           

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:534 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_crypto_core_test" links to:                                                                                                                        

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:535 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_group_announce_test" links to:                                                                                                                     

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:536 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_group_moderation_test" links to:                                                                                                                   

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:537 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_list_test" links to:                                                                                                                               

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:538 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_mem_test" links to:                                                                                                                                

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:539 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_mono_time_test" links to:                                                                                                                          

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:540 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_ping_array_test" links to:                                                                                                                         

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.                                                                                                                         
    * A find_package call is missing for an IMPORTED target.                                                                                                      
    * An ALIAS target is missing.                                                                                                                                 

Call Stack (most recent call first):                                                                                                                              
  CMakeLists.txt:541 (unit_test)                                                                                                                                  


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_test_util_test" links to:                                                                                                                          

    GTest::gmock                                                                                                                                                  

  but the target was not found.  Possible reasons include:                                                                                                        

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Call Stack (most recent call first):
  CMakeLists.txt:542 (unit_test)


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_tox_test" links to:

    GTest::gmock

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Call Stack (most recent call first):
  CMakeLists.txt:543 (unit_test)


CMake Error at CMakeLists.txt:522 (target_link_libraries):
  Target "unit_util_test" links to:

    GTest::gmock

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Call Stack (most recent call first):
  CMakeLists.txt:544 (unit_test)


-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.