From a9f8f27b216876e1aadfc1c3588c905173a5f9d7 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <anonymous.maarten@gmail.com>
Date: Sat, 28 Oct 2017 08:15:34 +0200
Subject: [PATCH] cmake: add coverage support

---
 cmake/ctest/experimental_script.ctest | 23 +++++++++++------------
 cmake_configure.cmake                 | 22 ++++++++++++++++++++++
 cmake_options.cmake                   |  4 +++-
 tests/CMakeLists.txt                  |  4 +++-
 4 files changed, 39 insertions(+), 14 deletions(-)

diff --git a/cmake/ctest/experimental_script.ctest b/cmake/ctest/experimental_script.ctest
index d0d12c67..f767aac5 100644
--- a/cmake/ctest/experimental_script.ctest
+++ b/cmake/ctest/experimental_script.ctest
@@ -2,16 +2,15 @@ cmake_minimum_required(VERSION 3.2.2)
 
 list(APPEND CMAKE_MODULE_PATH "${CTEST_SCRIPT_DIRECTORY}/../modules")
 
-get_filename_component(SRC_DIR "${CTEST_SCRIPT_DIRECTORY}/../.." ABSOLUTE)
-get_filename_component(BIN_DIR "${SRC_DIR}/build/experimental" ABSOLUTE)
+get_filename_component(CTEST_SOURCE_DIRECTORY "${CTEST_SCRIPT_DIRECTORY}/../.." ABSOLUTE)
+get_filename_component(CTEST_BINARY_DIRECTORY "${CTEST_SOURCE_DIRECTORY}/build/experimental" ABSOLUTE)
 
-set(CTEST_SOURCE_DIRECTORY "${SRC_DIR}")
-set(CTEST_BINARY_DIRECTORY "${BIN_DIR}")
 set(CTEST_CMAKE_GENERATOR "Unix Makefiles")
-ctest_empty_binary_directory("${BIN_DIR}")
+set(CTEST_COVERAGE_COMMAND "gcov")
 
-set(CMAKE_BINARY_DIR "${BIN_DIR}")
-set(CMAKE_CURRENT_BINARY_DIR "${BIN_DIR}")
+if(EXISTS "${CTEST_BINARY_DIRECTORY}/CMakeCache.txt")
+    ctest_empty_binary_directory("${CTEST_BINARY_DIRECTORY}")
+endif()
 
 include(GetGitRevisionDescription)
 get_git_head_revision(GIT_REFSPEC GIT_SHA1)
@@ -23,12 +22,12 @@ set(CTEST_BUILD_NAME "experimental_script-${SHORT_COMMIT}")
 ctest_start("Experimental")
 ctest_configure(
     OPTIONS
-        "-DBUILD_VIEWER=1;-DBUILD_TESTS=1"
+        "-DBUILD_VIEWER=1;-DBUILD_TESTS=1;-DTEST_COVERAGE=1;-DRW_VERBOSE_DEBUG_MESSAGES=0"
     )
 ctest_build()
-ctest_test(
-    RETURN_VALUE TEST_RESULT
-    )
+ctest_test()
+ctest_coverage()
+ctest_coverage()
 ctest_submit(
     RETURN_VALUE SUBMIT_RESULT
     )
@@ -39,5 +38,5 @@ message("Build Name: ${CTEST_BUILD_NAME}")
 if(NOT SUBMIT_RESULT EQUAL "0")
     message("Uploading results failed.")
     message("Execute the next command to submit later.")
-    message("make -C \"CTEST_BINARY_DIRECTORY\" ExperimentalSubmit")
+    message("make -C \"${CTEST_BINARY_DIRECTORY}\" ExperimentalSubmit")
 endif()
diff --git a/cmake_configure.cmake b/cmake_configure.cmake
index 4ae859e6..a8cfb11b 100644
--- a/cmake_configure.cmake
+++ b/cmake_configure.cmake
@@ -68,3 +68,25 @@ elseif(FAILED_CHECK_ACTION STREQUAL "BREAKPOINT")
 else()
     message(FATAL_ERROR "Illegal FAILED_CHECK_ACTION option. (was '${FAILED_CHECK_ACTION}')")
 endif()
+
+if(TEST_COVERAGE)
+    if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
+        message("Test Coverage enabled. Setting CMAKE_BUILD_TYPE to Debug.")
+        set(CMAKE_BUILD_TYPE "Debug")
+    endif()
+    if(NOT BUILD_TESTS)
+        message("TestCoverage enabled. Enabling BUILD_TESTS.")
+        set(BUILD_TESTS "ON")
+    endif()
+    target_compile_options(rw_interface
+        INTERFACE
+            "-O0"
+            "-fprofile-arcs"
+            "-ftest-coverage"
+        )
+    set_target_properties(rw_interface
+        PROPERTIES
+            INTERFACE_LINK_LIBRARIES
+                gcov
+    )
+endif()
diff --git a/cmake_options.cmake b/cmake_options.cmake
index 95368fbf..32b4dd03 100644
--- a/cmake_options.cmake
+++ b/cmake_options.cmake
@@ -15,5 +15,7 @@ set(BIN_DIR "bin" CACHE STRING "Prefix subdirectory to put the binaries in.")
 set(DOC_DIR "share/doc/openrw" CACHE STRING "Prefix subdirectory to put the documentation in.")
 
 if(NOT CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build, options are: Debug Release" FORCE)
+  set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build, options are: Debug Release")
 endif()
+
+option(TEST_COVERAGE "Enable coverage analysis (implies CMAKE_BUILD_TYPE=Debug)")
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 315ca70e..a8accb9b 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -77,4 +77,6 @@ target_link_libraries(run_tests
         ${Boost_SYSTEM_LIBRARY}
     )
 
-add_test(UnitTests run_tests)
+add_test(NAME UnitTests
+    COMMAND "$<TARGET_FILE:run_tests>"
+    )