Perhaps I am missing something here but doesn't the following do what you are looking for? When I use the stdout redirection to stderr like in the original (1>&2), I get strange behavior. When I omit it, it seems to do what you are looking to do.
i used 1>&2 to see when the shell-comand is executed.
t1: hallo :=$(shell echo hallo)
t1: echo $(hallo)
t2: echo $(hallo)
the shell-command is executed even if i say "make t2". the shell-command should only be executed once and only if the rule t1 gets executed.
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