Initial checkin

cmake/Submodules.cmake

@@ -0,0 +1,53 @@
+if(EXISTS "${PROJECT_SOURCE_DIR}/.gitmodules")
+message(STATUS "Updating submodules to their latest/fixed versions")
+message(STATUS "(this can take a while, please be patient)")
+
+### First, get all submodules in
+if(${GIT_SUBMODULES_CHECKOUT_QUIET})
+    execute_process(
+        COMMAND             git submodule update --init --recursive
+        WORKING_DIRECTORY   ${PROJECT_SOURCE_DIR}
+        OUTPUT_QUIET
+        ERROR_QUIET
+    )
+else()
+    execute_process(
+        COMMAND             git submodule update --init --recursive
+        WORKING_DIRECTORY   ${PROJECT_SOURCE_DIR}
+    )
+endif()
+
+### Then, checkout each submodule to the specified commit
+# Note: Execute separate processes here, to make sure each one is run,
+# should one crash (because of branch not existing, this, that ... whatever)
+foreach(GIT_SUBMODULE ${GIT_SUBMODULES})
+
+    if( "${GIT_SUBMODULE_VERSION_${GIT_SUBMODULE}}" STREQUAL "" )
+        message(STATUS "no specific version given for submodule ${GIT_SUBMODULE}, checking out master")
+        set(GIT_SUBMODULE_VERSION_${GIT_SUBMODULE} "master")
+    endif()
+
+    if( "${GIT_SUBMODULE_DIR_${GIT_SUBMODULE}}" STREQUAL "" )
+        set(GIT_SUBMODULES_DIRECTORY external)
+    else()
+        set(GIT_SUBMODULES_DIRECTORY ${GIT_SUBMODULE_DIR_${GIT_SUBMODULE}})
+    endif()
+
+    if(${GIT_SUBMODULES_CHECKOUT_QUIET})
+        execute_process(
+            COMMAND             git checkout ${GIT_SUBMODULE_VERSION_${GIT_SUBMODULE}}
+            WORKING_DIRECTORY   ${PROJECT_SOURCE_DIR}/${GIT_SUBMODULES_DIRECTORY}/${GIT_SUBMODULE}
+            OUTPUT_QUIET
+            ERROR_QUIET
+        )
+    else()
+        message(STATUS "checking out ${GIT_SUBMODULE}'s commit/tag ${GIT_SUBMODULE_VERSION_${GIT_SUBMODULE}}")
+        execute_process(
+            COMMAND             git checkout ${GIT_SUBMODULE_VERSION_${GIT_SUBMODULE}}
+            WORKING_DIRECTORY   ${PROJECT_SOURCE_DIR}/${GIT_SUBMODULES_DIRECTORY}/${GIT_SUBMODULE}
+        )
+    endif()
+
+endforeach(${GIT_SUBMODULE})
+
+endif()