[Cmake] GNU Makefile dependencies unnecessarily restrict make -k

[Wheeler, Frederick W (Research)]

It looks to me like cmake is creating Makefile stanzas that have unneeded
dependencies, which causes "make -k" to not work as it should.

Example: In the VXL project, the core/vul directory has 2 subdirs: examples
and tests whose builds are independent.  Nothing in examples depends on
anything in tests, and vice versa.  However, the GNU Makefile produced by
CMake has this stanza.


default_target_tests: $(TARGETS) default_target_examples
	@if test ! -d /home/wheeler/work_vxl/vxl_bld_cyg/core/vul/tests;
then $(MAKE) rebuild_cache; fi
	echo /home/wheeler/work_vxl/vxl_bld_cyg/core/vul/tests: building
default_target
	@cd /home/wheeler/work_vxl/vxl_bld_cyg/core/vul/tests; $(MAKE)
default_target


It says that default_target_tests depends on default_target_examples, but
why?

This causes problems when using the "-k" option to "make".  If there is a
problem building in the examples directory, it would be nice to still go
ahead and build the tests directory, if you used the -k option.

By removing the "default_target_examples" from the stanza above I was able
to verify correct behavior of "make -k".  However, I also added this line...

.PHONY: default_target_tests

I think cmake should add .PHONY: lines like this for all targets that are
not actual files when generating gnu makefiles.

I'm using the latest cmake cygwin package.



Regards,
Fred Wheeler