add cmake option to fetch full SHA of git HEAD

Author: michalsc

CMakeLists.txt

@@ -4,6 +4,7 @@ project(Emu68 VERSION 0.9.20)
 include(cmake/verstring.cmake)
 include(cmake/firmware_download.cmake)
 get_verstring(VERSTRING)
+get_git_sha(GIT_SHA)
 
 set(CMAKE_C_EXTENSIONS ON)
 set(CMAKE_CXX_STANDARD 11)
@@ -188,4 +189,4 @@ add_subdirectory(external)
 
 target_link_libraries(Emu68.elf tinystl capstone-static)
 target_include_directories(Emu68.elf PRIVATE ${CMAKE_SOURCE_DIR}/include ${CMAKE_SOURCE_DIR}/external/capstone/include)
-target_compile_definitions(Emu68.elf PRIVATE VERSION_STRING="${VERSTRING}")
+target_compile_definitions(Emu68.elf PRIVATE VERSION_STRING="${VERSTRING}" GIT_SHA="${GIT_SHA}")

cmake/verstring.cmake

@@ -9,3 +9,9 @@ function(get_verstring OUTPUT)
     endif()
     set(${OUTPUT} "$VER: ${PROJECT_NAME} ${PROJECT_VERSION} ${PROJECT_DATE} git:${GIT_HASH}${GIT_PORCELAIN}" PARENT_SCOPE)
 endfunction(get_verstring)
+
+function(get_git_sha OUTPUT)
+    find_package(Git)
+    execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse HEAD WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} OUTPUT_VARIABLE GIT_HASH OUTPUT_STRIP_TRAILING_WHITESPACE)
+    set(${OUTPUT} "${GIT_HASH}" PARENT_SCOPE)
+endfunction(get_git_sha)