CMake 2.8.12 and lower allowed the SOURCE signature in add_custom_command

In CMake 3.0 the policy CMP0050 was introduced where it could be set to OLD to keep this behaviour while for NEW an error was raised.
Since CMake 3.5.2 a warning comes up when using the OLD behaviour and that it will be removed in a future version.

In FreeCAD we switched to the new behaviour now and removed the SOURCE signature from add_custom_command which affects the macros
fc_copy_sources, fc_target_copy_resource and fc_target_copy_resource_flat and their usage.
It's not possible any more to add files to a target by using the macros. Now a file must be added to the target before using the macros.

This commit fixes it for Arch, Draft, OpenSCAD, Material, Plot and Ship

src/Mod/Arch/CMakeLists.txt

@@ -56,12 +56,17 @@ SET(Arch_presets
 
 SOURCE_GROUP("" FILES ${Arch_SRCS})
 
+SET(ArchGuiIcon_SVG
+    Resources/icons/ArchWorkbench.svg
+)
+
 ADD_CUSTOM_TARGET(Arch ALL
-    SOURCES ${Arch_SRCS} ${Arch_QRC_SRCS}
+    SOURCES ${Arch_SRCS} ${Arch_QRC_SRCS} ${Dice3DS_SRCS} ${Arch_presets} ${ArchGuiIcon_SVG}
 )
 
 fc_copy_sources(Arch "${CMAKE_BINARY_DIR}/Mod/Arch" ${Arch_SRCS})
 fc_copy_sources(Arch "${CMAKE_BINARY_DIR}/Mod/Arch" ${Dice3DS_SRCS})
+fc_copy_sources(Arch "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_DATADIR}/Mod/Arch" ${ArchGuiIcon_SVG})
 
 fc_target_copy_resource(Arch
     ${CMAKE_SOURCE_DIR}/src/Mod/Arch
@@ -88,7 +93,6 @@ INSTALL(
         ${Dice3DS_SRCS}
     DESTINATION Mod/Arch/Dice3DS
 )
-
 INSTALL(
     DIRECTORY
         Presets
@@ -96,11 +100,10 @@ INSTALL(
         ${CMAKE_INSTALL_DATADIR}/Mod/Arch
     FILES_MATCHING PATTERN "*.csv*"
 )
-
-SET(ArchGuiIcon_SVG
-    Resources/icons/ArchWorkbench.svg
+INSTALL(
+    FILES
+        ${ArchGuiIcon_SVG}
+    DESTINATION
+       "${CMAKE_INSTALL_DATADIR}/Mod/Arch/Resources/icons"
 )
 
-fc_copy_sources(Arch "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_DATADIR}/Mod/Arch" ${ArchGuiIcon_SVG})
-
-INSTALL(FILES ${ArchGuiIcon_SVG} DESTINATION "${CMAKE_INSTALL_DATADIR}/Mod/Arch/Resources/icons")