Makefile, configure/CONFIG: support MAKEFOR=DOCONLY

The new setting lets us build documentation without
an actual matlab or scilab installation on the build
host. (EPICS base is still required because the build
system is being used.)

Makefile

@@ -2,13 +2,17 @@
 TOP = .
 include $(TOP)/configure/CONFIG
 DIRS += configure
+ifneq ($(MAKEFOR),DOCONLY)
 DIRS += ezca
 DIRS += glue
+endif
 DIRS += documentation
 ifeq ($(MAKEFOR),MATLAB)
 DIRS += matlab
 endif
+ifneq ($(MAKEFOR),DOCONLY)
 DIRS += testing
+endif
 include $(TOP)/configure/RULES_TOP
 
 UNINSTALL_DIRS+=jar

configure/CONFIG

@@ -125,10 +125,14 @@ ifeq ($(MAKEFOR),MATLAB)
 else
   ifeq ($(MAKEFOR),SCILAB)
   else
-    $(error MAKEFOR variable in configure/CONFIG must be set to MATLAB or SCILAB [currently: "$(MAKEFOR)")
+    ifneq ($(MAKEFOR),DOCONLY)
+      $(error MAKEFOR variable in configure/CONFIG must be set to MATLAB, SCILABor DOCONLY [currently: "$(MAKEFOR)")
+    endif
   endif
 endif
 
+DOCONLYDIR=""
+
 ifndef $(MAKEFOR)DIR
   ifneq ($(strip $($(MAKEFOR)DIR_$(EPICS_HOST_ARCH))),)
     $(MAKEFOR)DIR=$($(MAKEFOR)DIR_$(EPICS_HOST_ARCH))