On 17 December 2015 at 17:45, Paul Smith <psm...@gnu.org> wrote: > On Thu, 2015-12-17 at 12:41 -0500, Paul Smith wrote: >> On Thu, 2015-12-17 at 15:34 +0000, Cristian Morales Vega wrote: >> > There is any way to say: "stop reading here, suppose this Makefile >> > has no more contents, end the read-in phase and start the target >> > -update phase"? >> >> No, that's not possible. > > Well, besides the obvious of putting the entire rest of the makefile in > a conditional: > > STOP = false > ... > STOP = true > > # Don't read any of the rest of the makefile if STOP is true > ifeq ($(STOP),true) > ... > endif > <EOF>
I was trying to avoid that. My usercase is this: I have a few programs that I want to build for multiple devices. Developers of each program create a Makefile defining some common variables and one include, e.g. ----------- include $(BASE_MAKEFILE) BINARIES := myprogram myprogram_CFLAGS := $(shell pkg-config --cflags mydependency) ----------- Then they can run make DEVICES="<device1> <device2>" and the program is built for both devices. Here "pkg-config", and other things in the real system, is a script which depends on some variables. These variables are different for each <deviceX>. What I am doing is checking DEVICES in BASE_MAKEFILE. If it contains more than one, I call the same Makefile again N times, each time with a single, different, <deviceX>. At this point the original make invocation just needs to take care of calling the sub-makes. The problem is that *once* the myprogram_CFLAGS definition is executed with DEVICES set with *all* the devices. And in this case pkg-config fails. This can be fixed changing the Makefile to either ----------- include $(BASE_MAKEFILE) BINARIES := myprogram myprogram_CFLAGS = $(shell pkg-config --cflags mydependency) ----------- or ----------- include $(BASE_MAKEFILE) ifeq ($(STOP),true) BINARIES := myprogram myprogram_CFLAGS := $(shell pkg-config --cflags mydependency) endif ----------- But I was trying to let developers use ":=", and avoid asking them to add two more lines. For that, and avoid an error output from the pkg-config call, I would need to to stop the read-in phase inside BASE_MAKEFILE. _______________________________________________ Help-make mailing list Help-make@gnu.org https://lists.gnu.org/mailman/listinfo/help-make
