>>> "pds" == Paul D Smith <[EMAIL PROTECTED]> writes:
[...]
pds> I assume you have some specific behavior you want make to undertake WRT
pds> to this "optional" file; can you be more specific?
One context were I would like that sort of behaviour is the following.
$(OUTDIR)/%.bin : %.cc
$(CXX) $(CXXFLAGS) $(CPPFLAGS) \
$(shell [ -f $*.cc.opts ] && cat $*.cc.opts) -o $@ $<
F.bin is compiled from F.cc with respect to additional options taken
from F.cc.opts when that file exists. If F.cc.opts exists I want
F.bin to be rebuilt each time F.cc or F.cc.opts is modified, otherwise,
if F.cc.opts does not exists rebuilt should only happends
when F.cc is modified.
Of course, I could create empty options files (*.cc.opts) for each source
file (*.cc) that doesn't have one. But in my build only a few files needs
such additional options and I don't want to get polluted with dozens of
empty files.
My present solution is :
ifdef OPTS
$(OUTDIR)/%.bin : %.cc $(OUTDIR_CREATE) $(filter-out NIL, $(OPTS))
$(CXX) $(CXXFLAGS) $(CPPFLAGS) \
$(shell [ -f $*.cc.opts ] && cat $*.cc.opts) -o $@ $<
else
FORCE :
$(OUTDIR)/%.bin : FORCE
make $@ OPTS="$(wildcard $*.cc.opts) NIL"
endif
which as I said is not efficient.
pds> Do you mean that if the file doesn't exist, it should be ignored
pds> completely by make, but if it does exist it should go through all the
pds> "normal" prerequisite processing (making sure it's up-to-date, etc.)?
Precisely.
--
Alexandre Duret-Lutz
