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option(ITK_USE_SYSTEM_GOOGLETEST "Use an outside build or installed source of GoogleTest. Set GTEST_ROOT to specify location." ${ITK_USE_SYSTEM_LIBRARIES})
mark_as_advanced(ITK_USE_SYSTEM_GOOGLETEST)
if(ITK_USE_SYSTEM_GOOGLETEST)
# The recommendation from google test is NOT to compile google tests
# for system installs, but allow users of the library to include the
# source in their project.
set( GTEST_SRC_SEARCH_PATHS
"/usr/src/googletest"
"/usr/src/gtest"
)
if (NOT DEFINED GTEST_ROOT)
foreach( search_path ${GTEST_SRC_SEARCH_PATHS})
if(EXISTS "${search_path}/CMakeLists.txt")
set( GTEST_ROOT "${search_path}")
break()
endif()
endforeach()
endif()
if( DEFINED GTEST_ROOT AND EXISTS "${GTEST_ROOT}/CMakeLists.txt")
find_path(GTEST_INCLUDE_DIRS gtest/gtest.h
PATHS "${GTEST_ROOT}"
NO_DEFAULT_PATH)
if("${GTEST_INCLUDE_DIRS}" STREQUAL "")
message(WARNING "GTEST_ROOT appears to be a source directory \
but \"gtest/gtest.h\" can not be found in source directory: \
${GTEST_ROOT}")
endif()
else()
find_package( GTest REQUIRED )
endif ()
endif()
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