Re: SNCSEQ error when making MakeBaseApp.pl

[Andrew Johnson <anj@aps.anl.gov>]

Hello Saeed,

On 10/02/2016 08:18 AM, Saeed Haghtalab wrote:
> I want to create an App using makeBaseApp.pl but I faced the following
> error:

> make[3]: *** No rule to make target `sncExample.o', needed by
> `libtestSupport.a'.  Stop.
> make[3]: Leaving directory
> `/home/ilsfcontrol/Desktop/test/testApp/src/O.linux-x86_64'

> whenever I delete the SNCSEQ environment variable using 'unset SNCSEQ'
> or also if I comment out the following lines in ./testApp/src/MakeFile
> it can be compiled successfuly, but I don't know the reason.

> It should be noticed that I didn’t want to use the sequencer so, both
> SNCSEQ in configure/RELEASE and 'seq sncExample,' line in st.cmd were
> commented out.

The GNUMake program treats environment variables the same as it does
other variables set in a Makefile (or in other files included by the
Makefile such as in your configure/RELEASE file or other files in the
EPICS build system), so this test in the example Makefile will always
pass if you have the environment variable SNCSEQ set (unless it is set
to an empty string):
> ifneq ($(SNCSEQ),)

Thus you have already discovered one solution to your problem, you have
to unset the environment variable for that Makefile to work properly.
You could instead delete that conditionally compiled part of the
Makefile, if you don't want to use the sequencer anyway then it isn't
necessary.

You might want to avoid setting environment variables quite so
prolifically though, why are you setting the SNCSEQ environment variable
in the first place? You may hit similar problems in the future if you
use environment variables to point to other EPICS modules like this.

Hope this helps,

- Andrew

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