Re: how to call the sub_make in reading process not in dependency analysis process?

[Garrett Cooper]

On Thu, Nov 27, 2008 at 1:48 PM, Tao T <address@hidden> wrote:
>
> actually it still relate my last question. My original code is like this:
> target: $(depfile)
> BUILDUNITS := $(shell $(foreach unit,$(ALL_UNITS),cd
> $(REPOSITORY_ROOT)/units/$(unit)/source/sc/beh && $(MAKE) $(MAKECMDGOALS)
> BUILD_TYPE=$(BUILD_TYPE) 1>&2;))
> -include $(depfile)
> I need jump into the sub_make before $(depfile). This code can fulfill it.
> However, it can not stop asap when a error happens.
> Then I have two approach:
> 1. keep the shell function try add some error detector.
> 2. to get rid of the shell function.
>
> For the 1. way ,as so many nice guys suggested I tried so many methods: "set
> -e" "exit &&?" "&& true" It seems all does not work. The only work method is
> touch a error_flag, However, It also has some delay in exit make. the parent
> makefile can not recognize the error_flag immediately. I dont know why.the
> command is:
> ifneq (,$(wildcard error_flag))
> BUILDUNITS := $(shell rm -f error_flag)
> $(error Something bad happened.)
> endif
> Do you have some more suggestion for this part? Thanks
>
> For the 2. way the problem is how can I run the sub makefile when the
> reading process of parent makefile.Beacuse the $(depfile) need some file
> generate in sub make. If I can not run the sub makefile first, it will cause
> error. I think in my original code "BUILDUNITS :=&(shell )" can achieve this
> require .I don't know whether you can get my point. I hope I also could get
> some suggestion here for this part.
>
> thank in advance
> Tao

http://www.gnu.org/software/make/manual/make.html#Secondary-Expansion ?

If you instead clearly define the problem that you're trying to solve,
we can suggest some decent solutions to your problems than embedding
all of the error checking in Makefile's.

Thanks,
-Garrett