Hi,
I have the following two Makefiles. The difference between them are
that the commands are not the same. I don't understand why both rules
are executed in /tmp/double_targets_different_command and why only one
rule (always a, no matter what the order between a and b) is executed
in /tmp/double_targets_same_command. Would you please help me
understand it?
/tmp/double_targets_different_command$ make
a
touch a
b
touch b
/tmp/double_targets_different_command$ cat Makefile
.PHONY: all
all: a b
b: command.sh
@echo b
touch b
a: command.sh
@echo a
touch a
clean:
$(RM) a b
/tmp/double_targets_same_command$ make
a
echo 'a' > a; sleep 1; echo 'b' > b
/tmp/double_targets_same_command$ cat Makefile
.PHONY: all
all: a b
b: command.sh
@echo b
echo 'a' > a; sleep 1; echo 'b' > b
a: command.sh
@echo a
echo 'a' > a; sleep 1; echo 'b' > b
clean:
$(RM) a b
--
Regards,
Peng
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