Akim Demaille e66673aa64 m4: have b4_percent_define_if_define apply default values lazily ...

Currently `b4_percent_define_ifdef([foo])` assigns a default value to
`foo` when invoked.  As a consequence, skeletons such as lalr1.d
cannot specify their specific default values: `foo` was defined in
bison.m4.

Instead, provide `foo` with a default value when `b4_foo_if` is
invoked.

I could not measure a runtime difference between both cases.

* data/skeletons/bison.m4 (_b4_percent_define_define): New.
Helps getting rid of spurious indentation that resulted in spurious
white space in the output.
(b4_percent_define_if_define): Move the definition to...
(_b4_percent_define_if_define): when the defined macros is called.

2020-10-03 09:17:53 +02:00

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