Dear John,
John Graham-Cumming wrote:
Specifically this happens in your case 1 (in the current directory)
which you can get around by using $(CURDIR):
bar: -lfoo ; touch $@
$(CURDIR)/libfoo.so: ; touch $@
vpath lib%.so $(CURDIR)
Thank you very much. It's a bright idea. It seems it can help with
another my problem too:
Maxim Nikulin wrote:
3. Let's consider deep complicated recursive build (I wouldn't argue
about non-recursive approach and its advantages). Every package install
headers and libraries into intermediate directories so they are
available for other packages. I tried to speed up rebuilding by
minimizing of copy operations. The aim is not to copy a file in the
intermediate directory if it's not outdated. The rule
/intermediate/dir/libfoo.so: libfoo.so
$(INSTALL) $< $@
leads to complains on circular dependence if /intermediate/dir is in vpath.
(To clarify I should add 'if libfoo.so isn't built yet')
If the absolute path is specified before libfoo.so the problem
disappears. However real life is more complicated. I have to invoke
alien makefiles during the build. They don't know about intermediate
installation so I use 'cp --preserve=timestamps' as INSTALL. In case of
such INSTALL in my rules make sometimes decides that it should reinstall
file although it hasn't been updated. I think it's due Linux Virtual
File System has subsecond precision of timestamps, but ext3 file system
stores second only.
--
Maxim Nikulin
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