bug#9587: [PATCH] Automake claims $(*F), $(<D), etc. are non-POSIX.

[Bogdan]

Hello again.

 The attached patch allows the following symbols not to cause 
Automake errors about non-POSIX variables (and updates the test):

 $(@F) $(%F) $(?F) $(<F) $(*F) $(@D) $(%D) $(?D) $(<D) $(*D) $(%) 
$(?) $(<) $(*) $% $? $< $*

 I don't have the POSIX standard and didn't find any references to 
POSIX variables in GNU make's manual, so I assume the quotation in the 
defect report is correct.

 The patch doesn't do anything to check if the variables are 
supported by the end-user's 'make', because it's not the end-user's 
'make' which decides what is portable or not. The message is not 
changed either.

 I don't know if "$(<:.foo=.bar)" should be allowed, but that seems 
to be taken care of in 
lib/Automake/Variable.pm:scan_variable_expansions anyway (resulting in 
just "<" in this example).

 Fixes bug#9587.

--
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