My memory may be feeble, but the Internet remembers All. It turns out that I had this exact problem three years ago. I even asked a question about it on StackOverflow [1], where a helpful user pointed out that this is a known bug in make 3.82 [2] and suggested the solution
.SECONDEXPANSION:
%.o: $$(wildcard %.[fF])
$(FC) $(FFLAGS) -c $< -o $@
(splitting the rule should still also work, of course).
Since this problem was fixed in later versions of make and is easy to
circumvent if you are affected, I will leave my Makefiles as they are.
It remains a puzzle though that I cannot now reproduce the problem with
make 3.82 (neither with a make 3.81 that I found elsewhere). Maybe
RedHat backported the fix? ‘make -v’ says
GNU Make 3.82
Built for x86_64-redhat-linux-gnu
Elias
[1] http://stackoverflow.com/questions/21193024/wildcard-in-a-pattern-rule
[2] https://savannah.gnu.org/bugs/?func=detailitem&item_id=31621
--
Elias Assmann
Institute of Theoretical and Computational Physics
TU Graz <https://itp.tugraz.at/>
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