Improve the autorevision in cmake.

It now sets its default based on an initial testrun.

CMakeLists.txt

@@ -82,12 +82,34 @@ option(ENABLE_NLS "Enable building of translations" ON)
 option(ENABLE_LOW_MEM "Reduce memory usage by removing extra functionality" OFF)
 option(ENABLE_OMP "Enables OpenMP, and has additional dependencies" OFF)
 
-if(NOT UNIX)
-	set(DEFAULT_ENABLE_DISPLAY_REVISION false)
-else()
-	# TODO test whether can be enabled by default
-	set(DEFAULT_ENABLE_DISPLAY_REVISION false)
+if(NOT DEFINED ENABLE_DISPLAY_REVISION)
+	# Test whether the code is used in a repository if not autorevision will
+	# fail and should be disabled by default. If inside a repository enable
+	# the display of revision numbers by default.
+	execute_process(
+		COMMAND
+			${CMAKE_SOURCE_DIR}/utils/autorevision
+				-th
+				> ${CMAKE_CURRENT_BINARY_DIR}/revision.dummy
+		WORKING_DIRECTORY
+			${CMAKE_SOURCE_DIR}
+		OUTPUT_VARIABLE
+			 ENABLE_DISPLAY_REVISION_TEST_OUTPUT
+		ERROR_VARIABLE
+			ENABLE_DISPLAY_REVISION_TEST_ERRNO
+	)
+
+	if("${ENABLE_DISPLAY_REVISION_TEST_ERRNO}" STREQUAL "")
+		set(DEFAULT_ENABLE_DISPLAY_REVISION true)
+	else()
+		set(DEFAULT_ENABLE_DISPLAY_REVISION false)
+	endif()
+
+	unset(ENABLE_DISPLAY_REVISION_TEST_OUTPUT)
+	unset(ENABLE_DISPLAY_REVISION_TEST_ERRNO)
+
 endif()
+
 option(
 	ENABLE_DISPLAY_REVISION
 	"Enable the display of the revision number in the game, only enable it when in a checkout"

changelog

@@ -3,6 +3,7 @@ Version 1.11.2+dev:
    * Updated translations: Indonesian, Portuguese, Vietnamese
  * Miscellaneous and bug fixes
    * Switched to git version control. Hosting moved to SourceForge
+   * Improved: Autorevision based revision numbers in CMake.
 
 Version 1.11.2:
  * Add-ons client: