1 files changed, 103 insertions, 0 deletions
diff --git a/cmake/cc_rules.cmake b/cmake/cc_rules.cmake
new file mode 100644
index 0000000..7d32624
--- /dev/null
+++ b/cmake/cc_rules.cmake
@@ -0,0 +1,103 @@
+# Copyright 2017 Google
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+include(CMakeParseArguments)
+
+# cc_library(
+#   target
+#   SOURCES sources...
+#   DEPENDS libraries...
+# )
+#
+# Defines a new library target with the given target name, sources, and dependencies.
+function(cc_library name)
+  set(flag EXCLUDE_FROM_ALL)
+  set(multi DEPENDS SOURCES)
+  cmake_parse_arguments(ccl "${flag}" "" "${multi}" ${ARGN})
+
+  add_library(
+    ${name}
+    ${ccl_SOURCES}
+  )
+  add_objc_flags(${name} ccl)
+  target_link_libraries(
+    ${name}
+    PUBLIC
+    ${ccl_DEPENDS}
+  )
+
+  if(ccl_EXCLUDE_FROM_ALL)
+    set_property(
+      TARGET ${name}
+      PROPERTY EXCLUDE_FROM_ALL ON
+    )
+  endif()
+
+endfunction()
+
+# cc_test(
+#   target
+#   SOURCES sources...
+#   DEPENDS libraries...
+# )
+#
+# Defines a new test executable target with the given target name, sources, and
+# dependencies.  Implicitly adds DEPENDS on GTest::GTest and GTest::Main.
+function(cc_test name)
+  set(multi DEPENDS SOURCES)
+  cmake_parse_arguments(cct "" "" "${multi}" ${ARGN})
+
+  list(APPEND cct_DEPENDS GTest::GTest GTest::Main)
+
+  add_executable(${name} ${cct_SOURCES})
+  add_objc_flags(${name} cct)
+  add_test(${name} ${name})
+
+  target_link_libraries(${name} ${cct_DEPENDS})
+endfunction()
+
+# add_objc_flags(target sources...)
+#
+# Adds OBJC_FLAGS to the compile options of the given target if any of the
+# sources have filenames that indicate they are are Objective-C.
+function(add_objc_flags target)
+  set(_has_objc OFF)
+
+  foreach(source ${ARGN})
+    get_filename_component(ext ${source} EXT)
+    if((ext STREQUAL ".m") OR (ext STREQUAL ".mm"))
+      set(_has_objc ON)
+    endif()
+  endforeach()
+
+  if(_has_objc)
+    target_compile_options(
+      ${target}
+      PRIVATE
+      ${OBJC_FLAGS}
+    )
+  endif()
+endfunction()
+
+# add_alias(alias_target actual_target)
+#
+# Adds a library alias target `alias_target` if it does not already exist,
+# aliasing to the given `actual_target` target. This allows library dependencies
+# to be specified uniformly in terms of the targets found in various
+# find_package modules even if the library is being built internally.
+function(add_alias ALIAS_TARGET ACTUAL_TARGET)
+  if(NOT TARGET ${ALIAS_TARGET})
+    add_library(${ALIAS_TARGET} ALIAS ${ACTUAL_TARGET})
+  endif()
+endfunction()