Add git hash.

Fixes TheOpenSpaceProgram#85

CMakeLists.txt

@@ -66,6 +66,14 @@ if(NOT MSVC)
     add_compile_options(-fno-omit-frame-pointer)
 endif()
 
+include(FetchContent)
+
+FetchContent_Declare(cmake_git_version_tracking                   
+  GIT_REPOSITORY https://github.com/andrew-hardin/cmake-git-version-tracking.git
+  GIT_TAG 904dbda1336ba4b9a1415a68d5f203f576b696bb
+)
+FetchContent_MakeAvailable(cmake_git_version_tracking)
+
 # Compiler warnings can help find problems in code.
 IF(OSP_ENABLE_COMPILER_WARNINGS)
   # Enable additional warnings.

src/CMakeLists.txt

@@ -102,7 +102,8 @@ SET(OSP_MAGNUM_DEPS_LIBS
             dNewton dScene dModel dVehicle
             toml11
             spdlog
-            longeron)
+            longeron
+            cmake_git_version_tracking)
 target_link_libraries(osp-magnum-deps INTERFACE ${OSP_MAGNUM_DEPS_LIBS})
 add_dependencies(compile-osp-magnum-deps ${OSP_MAGNUM_DEPS_LIBS})
 

src/test_application/main.cpp

@@ -64,6 +64,14 @@
 #include <string_view>
 #include <thread>
 #include <unordered_map>
+#if __has_include("git.h")
+#include "git.h"
+#define GIT_HASH git_Describe()
+#define GIT_BRANCH git_Branch()
+#else
+#define GIT_HASH "00000"
+#define GIT_BRANCH "n/a"
+#endif
 
 using namespace testapp;
 
@@ -495,6 +503,8 @@ void debug_print_help()
         << "OSP-Magnum Temporary Debug CLI\n"
         << "Open a scenario:\n";
 
+    std::cout << "Version: " << GIT_HASH << " (" << GIT_BRANCH << ")\n";
+
     for (auto const& [name, rTestScn] : scenarios())
     {
         std::string spaces(longestName - name.length(), ' ');