Hi,
I encounter a use of 'set -e' in make file shell.
such as:
all:
set -e; cmd1; cmd2; cmd3
Does the 'set -e' means open error for cmd chain?
And does the above rule similiar with next one?
all:
cmd1 && cmd2 && cmd3
Best Regards.
carl shen
2009/7/8 <[email protected]>
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> 1. Re: Auto-checkout a file from RCS that is used to construct a
> prerequisites list (Richard Bassett)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 06 Jul 2009 21:13:53 +0200
> From: Richard Bassett <[email protected]>
> Subject: Re: Auto-checkout a file from RCS that is used to construct a
> prerequisites list
> To: Philip Guenther <[email protected]>
> Cc: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> For the record, I've managed to resolve this problem with some input
> from CHEN Cheng that I don't think was CCed to help-make. He suggested
> creating a rule such that Makefile itself depends on the _WITHTAB.PP
> files that I need to be available in order to construct other dependencies.
>
> This seems to work because the rule for Makefile itself causes the
> _WITHTAB.PP files to be retrieved from RCS and, provided the rule also
> touches Makefile itself, causes make to 'restart' and thus re-evaluate
> all the other dependency rules and incorporate any information contained
> in the _WITHTAB.PP files that are now available.
>
> However, it was still necessary to make the $(shell cat ..) calls in
> those other dependency rules smart enough not to generate a 'missing
> file' error initially when the files in question have yet to be fetched
> from RCS.
>
> So, this is what I ended up with (simplifying the actual situation
> somewhat):
>
> Makefile: msg/_WITHTAB.PP
> touch Makefile
>
> $(msg_dsl_targets) : msg/_WITHTAB.PP $(patsubst %,$(target)%.tabo,$(subst
> $(comma),$(space),$(shell if [[ -e msg/_WITHTAB.PP ]] \; then cat
> msg/_WITHTAB.PP \; fi )))
>
>
> I'd like to thank Philip for his input too, which was very instructive
> even though I didn't need to go quite that far.
>
> Richard
>
> Philip Guenther wrote:
> > On Thu, Jul 2, 2009 at 8:45 AM, Richard
> > Bassett<[email protected]> wrote:
> >
> >> Background: I'm bootstrapping a Domain-specific language and I'm trying
> to
> >> automate a full build, where make checks all the required files out from
> >> RCS. My DSL has a simple preprocessor for textual substitution and
> >> currently I allow a file named _WITHTAB.PP in a source subdirectory to
> >> specify a list of 'preprocessor substitution tables' to apply to all the
> >> sources in that subdirectory.
> >>
> >> This means that the targets produced from each source file in a
> directory
> >> depend on any _WITHTAB.PP file in that directory and on the
> 'preprocessor
> >> substitution tables to apply' that are listed in the _WITHTAB.PP file.
> >>
> >> So, I tried to handle that in my makefile like this:
> >>
> > ...
> >
> >> $(msg_dsl_targets) : msg/_WITHTAB.PP $(patsubst
> >> %,$(target)%.tabo,$(subst $(comma),$(space),$(shell cat
> >> msg/_WITHTAB.PP)))
> >>
> >
> > Hmm, you must have .SECONDEXPANSION: in play...
> >
> >
> >
> >> As is probably obvious, the _WITHTAB.PP file contains a commalist of
> simple
> >> names such as "STD,T1,T2" and I'm just transforming that into a
> >> space-separated list of the prerequisite targets (that will be built
> from
> >> the source 'substitution tables') such as "STD.tabo T1.tabo T2.tabo"
> >>
> >> This seems just fine in my development environment where the _WITHTAB.PP
> >> file already exists. My problem is that when I try and build in some
> other
> >> 'clean' environment and I want make to fetch all the source from RCS
> >> automatically, I get the following error:
> >>
> >> cat: msg/_WITHTAB.PP: No such file or directory
> >>
> >>
> >> Now, I *think* I understand this - I'm assuming that make wants to
> process
> >> all the rules and construct its 'database' before actually taking any
> >> actions such as fetching something from RCS.
> >>
> >> So, if I have understood correctly, my problem is that I somehow need to
> get
> >> make to fetch the msg/_WITHTAB.PP file from RCS *before* constructing
> those
> >> dependencies in which the file itself participates.. but I'm not quite
> clear
> >> if that's possible or how one would go about it.
> >>
> >> I can see that what I'm doing is conceptually similar to include-ing
> another
> >> makefile except that my _WITHTAB.PP file is not in fact a makefile
> fragment.
> >> So I wonder if there's some trick possible with include maybe - but
> again I
> >> can't quite see how to make it happen!
> >>
> >> I can also see there is an analogy with an #included C header file that
> >> #includes other header files and that leads me to think that I could
> >> manually maintain say a _WITHTAB.d file alongside each _WITHTAB.PP file
> -
> >> ie. _WITHTAB.d would be an includeable makefile fragment that just
> expressed
> >> the dependency of _WITHTAB.PP on the items listed therein.
> >>
> >> But then I'd have to maintain two files, sacrilege.
> >>
> >
> > Well, there's always the alternate heresy of fixing the program that
> > generates _WITHTAB.PP to write "TABS=" at the start of it. Then you
> > could include it directly and use ${TABS} where needed. Problem
> > solved.
> >
> >
> > Otherwise, if you need something more complex...
> >
> > It sounds like you need some tool that you could tell how to build
> > _WITHTAB.d from _WITHTAB.PP and that that only needed to be done if
> > the latter was newer than the former. Have you considered using
> > 'make' for that?
> >
> > _WITHTAB.d: _WITHTAB.PP
> > sed -e 's/^/TABS=/' -e 's/,/ /g' -e 1q <_WITHTAB.PP >$@
> > -include _WITHTAB.d
> >
> >
> > Philip Guenther
> >
> >
>
>
>
>
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