#14 Abort configure if --with specified language not found

[F. Postma]

It would be usefull if configure would abort when a
langauge is specified using --with-java for example but
not enough information is found. (java needs three
options to work fully for example)

Bit annoying to find out it cheerfully ignored a language
after compiling/testing.

[Olly Betts]

It would arguably be nicer if it did, but it only affects the test-suite not what target languages are supported by the built swig, and configure does at least now clearly report which languages were found at the end of the run, e.g.:

[...]

configure: creating ./config.status

The SWIG test-suite and examples are configured for the following languages:
csharp go java javascript lua perl5 php python r ruby tcl 

Given nobody's implemented the "abort" part in nearly 19 years, I think that summary is probably good enough and I'm going to close this now. If anyone wants to work on it, please submit a pull request at https://github.com/swig/swig