[bug #64185] *** only one 'else' per conditional. Stop. due to else in recipe

[Dmitry Goncharov]

Follow-up Comment #2, bug #64185 (project make):

It is also necessary to ignore rule definitions in the branches which are not
taken from the point of view of correctness.


all: hello.tsk
hello=1
ifdef hello
hello.tsk:; echo true
else
hello.tsk:; echo false
endif


Here, we need the 'echo true' rule to be defined. If make honored the else
branch, then make would've redefined 'echo true' with 'echo false'.


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