Add tests for e3-sequencer compilation

This commit also modifies how driver.makefile processes .st/.stt files. According to the SNL documentation, .stt files should not be pre-processed. However, driver.makefile has historically been performing the exact same actions to both types of files, counter to what the documentation said.

require-ess/tools/driver.makefile

@@ -514,7 +514,7 @@ DBDFILES += $(patsubst %.stt,%_snl.dbd,$(notdir $(filter %.stt,${SRCS})))
 DBDFILES += $(patsubst %.gt,%.dbd,$(notdir $(filter %.gt,${SRCS})))
 
 # snc location
-SNCALL=$(shell ls  -dv $(E3_SITEMODS_PATH)/sequencer/$(sequencer_VERSION)/bin/$(EPICS_HOST_ARCH) 2> /dev/null))
+SNCALL=$(shell ls  -dv $(E3_SITEMODS_PATH)/sequencer/$(sequencer_VERSION)/bin/$(EPICS_HOST_ARCH) 2> /dev/null)
 SNC=$(lastword $(SNCALL))/snc
 
 ifneq (,$(strip $(VLIBS)))
@@ -698,59 +698,35 @@ ${INSTALL_BINS}: $(addprefix ../,$(filter-out /%,${BINS})) $(filter /%,${BINS})
 
 # Create SNL code from st/stt file.
 # Important to have %.o: %.st and %.o: %.stt rule before %.o: %.c rule!
-# Preprocess in any case because docu and implemented EPICS rules mismatch here.
 
 CPPSNCFLAGS1  = $(filter -D%, ${OP_SYS_CFLAGS})
 CPPSNCFLAGS1 += $(filter-out ${OP_SYS_INCLUDE_CPPFLAGS} ,${CPPFLAGS}) ${CPPSNCFLAGS}
 CPPSNCFLAGS1 += -I $(dir $(SNC))../../include
 SNCFLAGS += -r
 
+%.i: %.st
+	@echo ">> Preprocessing $(<F)"
+	$(CPP) ${CPPSNCFLAGS1} $< > $(*F).i
 
-# 1) ESS uses 7.0.3.1 as the minimal EPICS BASE, so we don't need to check 3.13,
-# 2) We also need -c option in $(COMPILE.c) in order to compile generated source file properly
-# 3) SNC (2.1.21) should use -o, because without them, snc returns $(*F).i.c instead of $(*F).c
-#    With the EPICS standard building rule, -o and mv are used.
-#
-# Tuesday, November 28 15:59:37 CET 2017, Jeong Han Lee
-
-
-%$(OBJ) %_snl.dbd: %.st
+%.c: %.i
 	@echo ""
 	@echo ">> SNC building process .... "
 	@echo ">> SNC                  : $(SNC)"
 	@echo ">> SNC_VERSION          : $(sequencer_VERSION)"
-	@echo ">> Preprocessing $(<F)"
-	$(RM) $(*F).i
-	$(CPP) ${CPPSNCFLAGS1} $< > $(*F).i
-	@echo ">> Converting $(*F).i to $(*F).c"
-	$(RM) $@
 	@echo ">> SNC is defined as $(SNC)"
-	$(SNC) $(TARGET_SNCFLAGS) $(SNCFLAGS) $(*F).i -o $(*F).c.tmp
-	@mv $(*F).c.tmp $(*F).c
-	@echo ">> Compiling $(*F).c"
-	$(RM) $@
-	$(COMPILE.c) -c ${SNC_CFLAGS} $(*F).c
+	$(SNC) $(TARGET_SNCFLAGS) $(SNCFLAGS) $(*F).i -o $(*F).c
+
+%_snl.dbd: %.c
 	@echo ">> Building $(*F)_snl.dbd"
 	awk -F [\(\)]  '/epicsExportRegistrar/ { print "registrar (" $$2 ")"}' $(*F).c > $(*F)_snl.dbd
 
-%$(OBJ) %_snl.dbd: %.stt
+%.c: %.stt
 	@echo ""
 	@echo ">> SNC building process .... "
 	@echo ">> SNC                  : $(SNC)"
 	@echo ">> SNC_VERSION          : $(sequencer_VERSION)"
-	@echo ">> Preprocessing $(<F)"
-	$(RM) $(*F).i
-	$(CPP) ${CPPSNCFLAGS1} $< > $(*F).i
-	@echo ">> Converting $(*F).i to $(*F).c"
-	$(RM) $@
 	@echo ">> SNC is defined as $(SNC)"
-	$(SNC) $(TARGET_SNCFLAGS) $(SNCFLAGS) $(*F).i -o $(*F).c.tmp
-	@mv $(*F).c.tmp $(*F).c
-	@echo ">> Compiling $(*F).c"
-	$(RM) $@
-	$(COMPILE.c) -c ${SNC_CFLAGS} $(*F).c
-	@echo "Building $(*F)_snl.dbd"
-	awk -F [\(\)]  '/epicsExportRegistrar/ { print "registrar(" $$2 ")"}' $(*F).c > $(*F)_snl.dbd
+	$(SNC) $(TARGET_SNCFLAGS) $(SNCFLAGS) $< -o $(*F).c
 
 
 # Create GPIB code from *.gt file.