1 files changed, 49 insertions, 0 deletions
diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
new file mode 100644
index 000000000000..e90253fdfa1e
--- /dev/null
+++ b/cmake/Modules/AddCompilerRT.cmake
@@ -0,0 +1,49 @@
+include(AddLLVM)
+include(LLVMParseArguments)
+include(CompilerRTUtils)
+
+# Tries to add "object library" target for a given architecture
+# with name "<name>.<arch>" if architecture can be targeted.
+# add_compiler_rt_object_library(<name> <arch>
+#                                SOURCES <source files>
+#                                CFLAGS <compile flags>)
+macro(add_compiler_rt_object_library name arch)
+  if(CAN_TARGET_${arch})
+    parse_arguments(LIB "SOURCES;CFLAGS" "" ${ARGN})
+    add_library(${name}.${arch} OBJECT ${LIB_SOURCES})
+    set_target_compile_flags(${name}.${arch}
+      ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS})
+  else()
+    message(FATAL_ERROR "Archtecture ${arch} can't be targeted")
+  endif()
+endmacro()
+
+# Unittests support.
+set(COMPILER_RT_GTEST_PATH ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest)
+set(COMPILER_RT_GTEST_SOURCE ${COMPILER_RT_GTEST_PATH}/gtest-all.cc)
+set(COMPILER_RT_GTEST_INCLUDE_CFLAGS
+  -DGTEST_NO_LLVM_RAW_OSTREAM=1
+  -I${COMPILER_RT_GTEST_PATH}/include
+)
+
+# Use Clang to link objects into a single executable with just-built
+# Clang, using specific link flags. Make executable a part of provided
+# test_suite.
+# add_compiler_rt_test(<test_suite> <test_name>
+#                      OBJECTS <object files>
+#                      DEPS <deps (e.g. runtime libs)>
+#                      LINK_FLAGS <link flags>)
+macro(add_compiler_rt_test test_suite test_name)
+  parse_arguments(TEST "OBJECTS;DEPS;LINK_FLAGS" "" ${ARGN})
+  get_unittest_directory(OUTPUT_DIR)
+  file(MAKE_DIRECTORY ${OUTPUT_DIR})
+  set(output_bin "${OUTPUT_DIR}/${test_name}")
+  add_custom_command(
+    OUTPUT ${output_bin}
+    COMMAND clang ${TEST_OBJECTS} -o "${output_bin}"
+            ${TEST_LINK_FLAGS}
+    DEPENDS clang ${TEST_DEPS})
+  add_custom_target(${test_name} DEPENDS ${output_bin})
+  # Make the test suite depend on the binary.
+  add_dependencies(${test_suite} ${test_name})
+endmacro()