test: Bundle GTest/GMock 1.8.1 sources and provide a find script

[quassel.git] / cmake / FindGTest.cmake

diff --git a/cmake/FindGTest.cmake b/cmake/FindGTest.cmake
new file mode 100644 (file)
index 0000000..52c679c
--- /dev/null
+++ b/cmake/FindGTest.cmake
@@ -0,0 +1,69 @@
+# It is recommended that projects build GTest/GMock themselves, rather
+# than relying on system-provided libraries. This is to ensure that the
+# same build configuration is used for both test cases and the
+# libraries.
+#
+# This find module includes bundled sources to build the GTest and GMock
+# libraries. Since including the provided CMake build system as a
+# subproject would not allow for proper target installation,
+# and linking GTest as a static library poses a special kind of hell,
+# we rely on GTest build system internals to setup targets under our
+# control.
+#
+# This means that this find module will only work properly as long as
+# the layout and the internals of the provided GTest/GMock sources
+# do not change in incompatible ways. Thus, if the bundled sources
+# are updated, this find script may have to be adapted, too.
+#
+# This find module defines one alias target GMock::GMock to depend on.
+########################################################################
+
+include(FindPackageHandleStandardArgs)
+
+set(GTEST_VERSION "1.8.1")
+
+set(GTEST_BASE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/googletest-${GTEST_VERSION}")
+set(GTEST_SRC_DIR "${GTEST_BASE_DIR}/googletest")
+set(GTEST_INC_DIR "${GTEST_BASE_DIR}/googletest/include")
+set(GMOCK_SRC_DIR "${GTEST_BASE_DIR}/googlemock")
+set(GMOCK_INC_DIR "${GTEST_BASE_DIR}/googlemock/include")
+
+# We don't install our tests
+set(INSTALL_GTEST OFF)
+
+# Link against the runtime dynamically on Windows
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+
+# Here's where it gets shaky... include GTest's CMake macros, which
+# we'll use to setup the target with the expected compile flags.
+include(${GTEST_SRC_DIR}/cmake/internal_utils.cmake)
+
+# Provided by GTest, configure compile flags
+config_compiler_and_linker()
+
+# Create target using GTest's macro and compile flags
+set(TARGET gtest)
+cxx_shared_library(${TARGET}
+    ${cxx_strict}
+    ${GTEST_SRC_DIR}/src/gtest-all.cc
+    ${GMOCK_SRC_DIR}/src/gmock-all.cc
+)
+
+# Alias to follow our convention of namespaced targets
+add_library(GTest::GTest ALIAS gtest)
+
+# Set include dirs
+target_include_directories(${TARGET} SYSTEM BEFORE
+    PUBLIC
+        ${GTEST_INC_DIR}
+        ${GMOCK_INC_DIR}
+    PRIVATE
+        ${GTEST_SRC_DIR}
+        ${GMOCK_SRC_DIR}
+)
+
+# Ensure symbols are exported
+target_compile_definitions(${TARGET} INTERFACE -DGTEST_LINKED_AS_SHARED_LIBRARY=1)
+
+# Add support for find_package
+find_package_handle_standard_args(GTest DEFAULT_MSG GTEST_INC_DIR)