skips tests on systems without git

cmake-modules/AddGTest.cmake

@@ -30,6 +30,13 @@ endif()
 
 set(GTEST_PREFIX "${CMAKE_CURRENT_BINARY_DIR}/gtest")
 
+# try to find git - if found, setup gtest
+find_package(Git)
+if(NOT GIT_FOUND)
+	set(AddGTest_FOUND false CACHE BOOL "Was gtest setup correctly?")
+else(NOT GIT_FOUND)
+	set(AddGTest_FOUND true CACHE BOOL "Was gtest setup correctly?")
+	
 	ExternalProject_Add(gtest
 		GIT_REPOSITORY https://chromium.googlesource.com/external/googletest
 		TIMEOUT 10
@@ -62,3 +69,4 @@ include_directories(${source_dir}/gtest/include)
 
 	ExternalProject_Get_Property(gtest binary_dir)
 	link_directories(${binary_dir})
+endif(NOT GIT_FOUND)

test/CMakeLists.txt

@@ -46,6 +46,7 @@ SET( TEST_SRCS
 
 SOURCE_GROUP( tests FILES  ${TEST_SRCS} )
 
+if(AddGTest_FOUND)
 add_executable( unit
     unit/CCompilerTest.c
     unit/Main.cpp
@@ -60,5 +61,6 @@ target_link_libraries( unit assimp
 	debug ${GTEST_DEBUG_LIBRARIES}
 	optimized ${GTEST_RELEASE_LIBRARIES}
 )
+endif(AddGTest_FOUND)
 add_subdirectory(headercheck)