Hello.
While trying to implement a kind of memoization of lazy macros in GNU make
(needed for my work on Automake-NG), I've been encountering some strange
failure in GNU make (present in all of 3.80, 3.81, 3.82). Here is the
minimal reproducer I've been able to find:
mufoofoo = \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
xxxxxxxxxxxx
var = $(eval var := $$(mufoofoo))$(var)
dummy:
: $(firstword $(var))
Running the above, make dies with the following message:
Makefile:13: *** unterminated variable reference. Stop.
And any of the following minimal and *apparently irrelevant* changes to the
Makefile above that cause the error to disappear:
- changing 'var' with 'va' everywhere
- changing 'mufoofoo' with 'mfoofoo'
- removing *just one 'x'* from the value of mufoofoo
Any idea of what's going on here?
Regards,
Stefano
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