Hi Britton.
Assuming you have a Makefile like this:
all: test.o
clean:
rm -rf *.o
.PHONY: all clean
You can create two empty directories and perform make in each by setting VPATH
and build flags:
$ make -f ../src/Makefile CFLAGS=-DBUILD_1 VPATH=../src
cc -DBUILD_1 -c -o test.o ../src/test.c
The output file will be created in current dir, but the source will be found in
../src
The existing Makefile may be written so that not everything works with VPATH.
Or Better migrate to Autotools and use VPATH builds.
04.07.2018 23:08, Britton Kerin пишет:
> I'm frequently rebuilding and uploading both ends of a tx/rx system
> and it's just slow enough to be annoying. I'd like to rebuild the Tx
> and Rx ends in parallel but they need different build options for the
> same sources.
>
> I'm guessing the easiest approach is to do cp -r or so from a script
> and run make from there, and the tree is small enough that that will
> probably work ok, but I'm curious if anyone has a trick to do it in
> place somehow to avoid the cp and full rebuild of everything?
> Something like automagically injecting $$ into all non-phony targets
> or something?
>
> Thanks,
> Britton
>
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>
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