Follow-up Comment #7, bug #60077 (project make):
I wonder if &: makes sense as a pattern rule since regular pattern rules
already support multiple targets.
Regardless, I have also tested your implicit test without the & and get the
same results:
$ cat ../makefile4
.SECONDEXPANSION:
all: world.z hello.x
%.x %.z: $$(info in prereqs @ = $$@, @< = $$(@<), @^ = $$(@^))
$(info in recipe @ = $@, @< = $(@<), @^ = $(@^))
$ ./make -f ../makefile4 hello.x
in prereqs @ = hello.x, @< = hello.x, @^ = hello.x
in recipe @ = hello.x, @< = hello.x, @^ = hello.x hello.z
make: 'hello.x' is up to date.
I also tried hello.z and $(@<) is only correct inside the recipe as well.
$ ./make -f ../makefile4 hello.z
in prereqs @ = hello.z, @< = hello.z, @^ = hello.z
in recipe @ = hello.z, @< = hello.x, @^ = hello.x hello.z
make: 'hello.z' is up to date.
The problem appears to be due to second expansion for pattern rules happening
quite some time before also_make is set in pattern_search().
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