add googletest module

modules/googletest.cmake

@@ -0,0 +1,33 @@
+#.rst:
+#
+# Includes Google Test sources and adds a library "googletest".
+#
+# Variables used::
+#
+#   GOOGLETEST_ROOT
+#
+# Example autocmake.cfg entry::
+#
+#   [googletest]
+#   source: https://github.com/scisoft/autocmake/raw/master/modules/googletest.cmake
+#   define: '-DGOOGLETEST_ROOT=external/googletest'
+
+set(GOOGLETEST_ROOT external/googletest CACHE STRING "Google Test source root")
+
+message(STATUS "GOOGLETEST_ROOT set to ${GOOGLETEST_ROOT}")
+
+include_directories(
+    ${PROJECT_SOURCE_DIR}/${GOOGLETEST_ROOT}
+    ${PROJECT_SOURCE_DIR}/${GOOGLETEST_ROOT}/include
+    )
+
+set(GOOGLETEST_SOURCES
+    ${PROJECT_SOURCE_DIR}/${GOOGLETEST_ROOT}/src/gtest-all.cc
+    ${PROJECT_SOURCE_DIR}/${GOOGLETEST_ROOT}/src/gtest_main.cc
+    )
+
+foreach(_source ${GOOGLETEST_SOURCES})
+    set_source_files_properties(${_source} PROPERTIES GENERATED 1)
+endforeach()
+
+add_library(googletest ${GOOGLETEST_SOURCES})