From 4694d4f1a3f91b8720ade38c76431c7c8a96d761 Mon Sep 17 00:00:00 2001
From: "Unknown W. Brackets" <checkins@unknownbrackets.org>
Date: Sat, 2 Mar 2013 11:01:08 -0800
Subject: [PATCH] Add git-version.c generation to CMake.

---
 CMakeLists.txt    | 14 +++++++++++++-
 git-version.cmake | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 git-version.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cfabb3510d..dd4d055df7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -823,11 +823,23 @@ add_library(${CoreLibName} ${CoreLinkType}
 	Core/Util/ppge_atlas.cpp
 	Core/Util/ppge_atlas.h
 	$<TARGET_OBJECTS:GPU>
-	Globals.h)
+	Globals.h
+	git-version.c)
 target_link_libraries(${CoreLibName} Common native kirk cityhash
 	${GLEW_LIBRARIES} ${OPENGL_LIBRARIES})
 setup_target_project(${CoreLibName} Core)
 
+# Generate git-version.c at build time.
+add_custom_target(GitVersion ALL
+	DEPENDS something_that_never_exists)
+add_custom_command(OUTPUT something_that_never_exists
+	COMMAND ${CMAKE_COMMAND} -DSOURCE_DIR=${CMAKE_CURRENT_SOURCE_DIR}
+		-P ${CMAKE_CURRENT_SOURCE_DIR}/git-version.cmake)
+
+set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/git-version.c
+	PROPERTIES GENERATED TRUE)
+add_dependencies(${CoreLibName} GitVersion)
+
 add_library(GPU OBJECT
 	GPU/GLES/DisplayListInterpreter.cpp
 	GPU/GLES/DisplayListInterpreter.h
diff --git a/git-version.cmake b/git-version.cmake
new file mode 100644
index 0000000000..eca9a4de33
--- /dev/null
+++ b/git-version.cmake
@@ -0,0 +1,42 @@
+set(GIT_VERSION_FILE "${SOURCE_DIR}/git-version.c")
+set(GIT_VERSION "unknown")
+set(GIT_VERSION_UPDATE "1")
+
+find_package(Git)
+if(GIT_FOUND)
+	execute_process(COMMAND ${GIT_EXECUTABLE} describe --always
+		RESULT_VARIABLE exit_code
+		OUTPUT_VARIABLE GIT_VERSION)
+	if(NOT ${exit_code} EQUAL 0)
+		message(WARNING "git describe failed, unable to include version.")
+	endif()
+	string(STRIP ${GIT_VERSION} GIT_VERSION)
+else()
+	message(WARNING "git not found, unable to include version.")
+endif()
+
+if(EXISTS ${GIT_VERSION_FILE})
+	# Don't update if marked not to update.
+	file(STRINGS ${GIT_VERSION_FILE} match
+		REGEX "PPSSPP_GIT_VERSION_NO_UPDATE = 1")
+	if(NOT $[match} EQUAL "")
+		set(GIT_VERSION_UPDATE "0")
+	endif()
+
+	# Don't update if it's already the same.
+	file(STRINGS ${GIT_VERSION_FILE} match
+		REGEX "${GIT_VERSION}")
+	if(NOT $[match} EQUAL "")
+		set(GIT_VERSION_UPDATE "0")
+	endif()	
+endif()
+
+set(code_string "// This is a generated file.\n\n"
+	"const char *PPSSPP_GIT_VERSION = \"${GIT_VERSION}\"\;\n\n"
+	"// If you don't want this file to update/recompile, change to 1.\n"
+	"#define PPSSPP_GIT_VERSION_NO_UPDATE 0\n")
+
+message(WARNING "UPDATE: ${GIT_VERSION_FILE}")
+if ("${GIT_VERSION_UPDATE}" EQUAL "1")
+	file(WRITE ${GIT_VERSION_FILE} ${code_string})
+endif()
\ No newline at end of file