I have a question regarding the following article:
http://www.xs4all.nl/~evbergen/nonrecursive-make.html
The author sets of a compiler invocation as follows:
COMP = $(CC) $(CF_ALL) $(CF_TGT) -o $@ -c $<
The CF_TGT variable holds the target specific compiler flags that can be
set in each subdirectory's makefile.
And an implicit rule:
%.o: %.c
$(COMP)
For each of his subdirectory makefiles, he has a group of object file
targets called OBJS_$(d) that are ultimately compiled using the implicit
rule above ($(d) is the subdirectory for that makefile). The way he
enables custom compilation flags for his object targets is by adding a
prerequisite as follows:
$(OBJS_$(d)): CF_TGT := -I$(d)
Is there a potential race condition with this approach if -j is used?
It seems to me that CF_TGT could be overridden by another $(OBJS_$(d))
in a different subdirectory. If there isn't a race condition, is GNU
make creating a target specific copy of CF_TGT or somehow locking it
until the target has finished updating?
Thanks,
Josh
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