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find_library(GTEST_LIBRARY gtest
HINTS "/usr/local" "/usr/local/lib" "/usr/lib"
)
find_path(GTEST_INCLUDE_DIR gtest/gtest.h
HINTS "/usr/local/include" "/usr/include"
)
if((NOT GTEST_LIBRARY) OR (NOT GTEST_INCLUDE_DIR))
message(STATUS "Unable to find google test, cloning and building ...")
set(THREADS_REFER_PTHREAD_FLAG "ON")
find_package(Threads REQUIRED)
# Download and unpack googletest at configure time
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/external/CMakeLists.txt.in ${CMAKE_CURRENT_BINARY_DIR}/googletest-download/CMakeLists.txt)
execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
if(result)
message(FATAL_ERROR "CMake step for googletest failed: ${result}")
endif()
execute_process(COMMAND ${CMAKE_COMMAND} --build .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
if(result)
message(FATAL_ERROR "Build step for googletest failed: ${result}")
endif()
# Prevent overriding the parent project's compiler/linker
# settings on Windows
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
# Set GTEST interface to temporarily installed libgtest.a
set(GTEST_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/googletest-build/include)
set(GTEST_LIBRARY ${CMAKE_CURRENT_BINARY_DIR}/googletest-build/lib/libgtest.a)
add_library(gtest INTERFACE)
target_include_directories(gtest INTERFACE ${GTEST_INCLUDE_DIR})
target_link_libraries(gtest INTERFACE ${GTEST_LIBRARY} Threads::Threads)
else()
message(STATUS "Found googletest: ${GTEST_INCLUDE_DIR} ${GTEST_LIBRARY}")
add_library(gtest INTERFACE)
target_include_directories(gtest INTERFACE ${GTEST_INCLUDE_DIR})
target_link_libraries(gtest INTERFACE ${GTEST_LIBRARY} pthread)
endif()
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