Handle VersionGeneration outside of the main CMakeFile

This is actually a good change: we used to write a new
CMake file in configure time just to move it outside of the
source to the build dir at compile time. Now this file is
pre-created and it's only moved.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

CMakeLists.txt

@@ -91,6 +91,7 @@ include(cmake/Modules/HandleFindLibDiveComputer.cmake)
 include(cmake/Modules/HandleFindMarble.cmake)
 include(cmake/Modules/HandleFindGrantlee.cmake)
 include(cmake/Modules/HandleFtdiSupport.cmake)
+include(cmake/Modules/HandleVersionGeneration.cmake)
 
 pkg_config_library(LIBXML libxml-2.0 REQUIRED)
 pkg_config_library(LIBSQLITE3 sqlite3 REQUIRED)
@@ -146,61 +147,6 @@ if(BTSUPPORT)
 	add_definitions(-DBT_SUPPORT)
 endif()
 
-# Generate the ssrf-config.h every 'make'
-file(WRITE ${CMAKE_BINARY_DIR}/version.h.in
-"#define VERSION_STRING \"@VERSION_STRING@\"
-#define GIT_VERSION_STRING \"@GIT_VERSION_STRING@\"
-#define CANONICAL_VERSION_STRING \"@CANONICAL_VERSION_STRING@\"
-")
-
-file(WRITE ${CMAKE_BINARY_DIR}/version.cmake "
-	if(\${APPLE})
-		set(VER_OS darwin)
-	elseif(\${WIN32})
-		set(VER_OS win)
-	else()
-		set(VER_OS linux)
-	endif()
-	if(CMAKE_SYSTEM_NAME STREQUAL \"Windows\")
-		set(VER_OS win)
-	endif()
-	execute_process(
-		COMMAND sh scripts/get-version \${VER_OS}
-		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-		OUTPUT_VARIABLE VERSION_STRING
-		OUTPUT_STRIP_TRAILING_WHITESPACE
-	)
-	execute_process(
-		COMMAND sh scripts/get-version linux
-		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-		OUTPUT_VARIABLE GIT_VERSION_STRING
-		OUTPUT_STRIP_TRAILING_WHITESPACE
-	)
-	execute_process(
-		COMMAND sh scripts/get-version full
-		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-		OUTPUT_VARIABLE CANONICAL_VERSION_STRING
-		OUTPUT_STRIP_TRAILING_WHITESPACE
-	)
-	configure_file(\${SRC} \${DST} @ONLY)
-	if(CMAKE_SYSTEM_NAME STREQUAL \"Windows\")
-		execute_process(
-			COMMAND cat ${CMAKE_SOURCE_DIR}/packaging/windows/subsurface.nsi.in
-			COMMAND sed -e \"s/VERSIONTOKEN/\${GIT_VERSION_STRING}/\"
-			COMMAND sed -e \"s/PRODVTOKEN/\${CANONICAL_VERSION_STRING}/\"
-			OUTPUT_FILE ${CMAKE_BINARY_DIR}/staging/subsurface.nsi
-		)
-	endif()
-")
-
-add_custom_target(
-	version ALL COMMAND ${CMAKE_COMMAND} ${CMAKE_COMMAND}
-	-D SRC=${CMAKE_BINARY_DIR}/version.h.in
-	-D DST=${CMAKE_BINARY_DIR}/ssrf-version.h
-	-D CMAKE_SYSTEM_NAME=${CMAKE_SYSTEM_NAME}
-	-P ${CMAKE_BINARY_DIR}/version.cmake
-)
-
 # set up the different target platforms
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
 	set(SUBSURFACE_TARGET subsurface)

cmake/Modules/HandleVersionGeneration.cmake

@@ -0,0 +1,17 @@
+# Generate the ssrf-config.h every 'make'
+file(WRITE ${CMAKE_BINARY_DIR}/version.h.in
+"#define VERSION_STRING \"@VERSION_STRING@\"
+#define GIT_VERSION_STRING \"@GIT_VERSION_STRING@\"
+#define CANONICAL_VERSION_STRING \"@CANONICAL_VERSION_STRING@\"
+")
+
+file(COPY cmake/Modules/version.cmake
+    DESTINATION ${CMAKE_BINARY_DIR})
+
+add_custom_target(
+	version ALL COMMAND ${CMAKE_COMMAND} ${CMAKE_COMMAND}
+	-D SRC=${CMAKE_BINARY_DIR}/version.h.in
+	-D DST=${CMAKE_BINARY_DIR}/ssrf-version.h
+	-D CMAKE_SYSTEM_NAME=${CMAKE_SYSTEM_NAME}
+	-P ${CMAKE_BINARY_DIR}/version.cmake
+)

cmake/Modules/version.cmake

@@ -0,0 +1,39 @@
+if(${APPLE})
+	set(VER_OS darwin)
+elseif(${WIN32})
+	set(VER_OS win)
+else()
+	set(VER_OS linux)
+endif()
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+	set(VER_OS win)
+endif()
+execute_process(
+	COMMAND sh scripts/get-version ${VER_OS}
+	WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+	OUTPUT_VARIABLE VERSION_STRING
+	OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+execute_process(
+	COMMAND sh scripts/get-version linux
+	WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+	OUTPUT_VARIABLE GIT_VERSION_STRING
+	OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+execute_process(
+	COMMAND sh scripts/get-version full
+	WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+	OUTPUT_VARIABLE CANONICAL_VERSION_STRING
+	OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+configure_file(${SRC} ${DST} @ONLY)
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+	execute_process(
+		COMMAND cat ${CMAKE_SOURCE_DIR}/packaging/windows/subsurface.nsi.in
+		COMMAND sed -e \"s/VERSIONTOKEN/\${GIT_VERSION_STRING}/\"
+		COMMAND sed -e \"s/PRODVTOKEN/\${CANONICAL_VERSION_STRING}/\"
+		OUTPUT_FILE ${CMAKE_BINARY_DIR}/staging/subsurface.nsi
+	)
+endif()