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<== Date ==> <== Thread ==>

Subject: Re: another build problem with db dependencies
From: Benjamin Franksen <benjamin.franksen@helmholtz-berlin.de>
To: <tech-talk@aps.anl.gov>
Date: Fri, 30 Mar 2012 15:39:01 +0200
On Wednesday, March 28, 2012, Yves Lussignol wrote:
> Hi,
> 
> The perl script makeDbDepends.pl has been changed with EPICS Base
> R3.14.12.2. Now the script works and produces a file like this one:
> 
> $ cat O.linux-x86/iocLlrf.db.d
> ../O.Common/iocLlrf.db: llrfSim.db llrfLabview.db llrf.db llrfCavUp.db
> llrfCavTune.db llrfAcq.db
> ../O.Common/iocLlrf.db :
> 
> With previous EPICS Base versions the file looked like this:
> 
> $ cat O.linux-x86/iocLlrf.db.d
> ../O.Common/iocLlrf.db:
> 
> The first build works but the second build fails because the file
> iocLlrf.db.d exists:
> 
> $ make
> make -C O.linux-x86 -f ../Makefile TOP=../../.. T_A=linux-x86 install
> make[1]: Entering directory
> `/home/lussi/tmp/topSP2/llrfApp/db2/O.linux-x86' make[1]: *** No rule to
> make target `llrfSim.db', needed by
> `../O.Common/iocLlrf.db'.  Stop.
> make[1]: Leaving directory
> `/home/lussi/tmp/topSP2/llrfApp/db2/O.linux-x86' make: ***
> [install.linux-x86] Error 2
> 
> I tried to correct this with the patch found in the 3.14.12.2 known
> problems (rules-db.patch) and with the patch proposed by Bruce Hill, but
> none works for me.
> 
> My file iocLlrf.db is built from iocLlrf.substitutions. The substituted
> db files are located in my $(TOP)/db. But this location is not known by
> the make command. So I tried to modify the file RULES.Db this way:
> 
> vpath %.db $(USR_VPATH) $(GENERIC_SRC_DIRS) $(dir $(DB)) $(TOP)/db
> 
> But this modification introduces a circular dependency problem and it
> doesn't work.

The EPICS build system does not correctly handle dependencies between 
different Apps under the same TOP. The reason for this is the recursive call 
to make in subdirectories.

That said, you can do what you want by following the "advice" make gives you 
in the error message, which says:

> No rule to make target `llrfSim.db'

So, give it a rule! Like this:

$(COMMON_DIR)/llrfSim.db: $(INSTALL_LOCATION)/db/llrfSim.db:
	$(CP) $< $@

(should go into your AppThatUsesTheFile/Db/Makefile). You can also add such 
a rule to your RULES.Db like this:

$(LOCAL_DB): $(COMMON_DIR)/%.db: $(INSTALL_LOCATION)/db/%.db:
	$(CP) $< $@

and then say

LOCAL_DB += llrfSim.db

in your Makefile.

The rule fails if $(INSTALL_LOCATION)/db/llrfSim.db does not exist. So you 
want to tell make that the application that creates the llrfSim.db should be 
built before the one that uses it llrfSim.db. This can be done in the top 
level Makefile by saying

AppThatUsesTheFile_DEPEND_DIRS += AppThatCreatesTheFile

Cheers
Ben

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References:
another build problem with db dependencies Yves Lussignol

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