RFR: JDK-8146995 Introduce named arguments in configure

Erik Joelsson erik.joelsson at oracle.com
Wed Jan 13 19:50:47 UTC 2016

Forgot to include this in the last mail. Typo in comment.

27: like like

No need to redo webrev.


On 2016-01-13 15:43, Magnus Ihse Bursie wrote:
> Similar to how we use named argument in makefiles, we should support 
> named arguments in the configure scripts. This is possible using some 
> m4 black magic.
> My long-term goal with this is to provide readable functions for 
> handling common patterns, like parsing --with arguments and doing 
> proper action depending on the value of the flag.
> Since the m4 logic is hairy, to say the least, I chose to pick a more 
> simple function to use as test bench for getting the actual m4 
> underpinning to work.
> The essence of this change can be seen here:
> Just like in our Setup* macros in make, now it is possible to use 
> named arguments in autoconf macros. Named arguments can come in any 
> order. The framework will verify that only known arguments is allowed 
> in. It is also possible to mark an argument as compulsory (by 
> prefixing it with *). The framework will verify that all required 
> arguments are present.
> Don't ask me to explain the finer points of BASIC_DEFUN_NAMED. :) 
> m4/autoconf is non-trivial to get correct, with few debugging 
> possibilities and sparse documentation. There's a lot of trial and 
> error behind this final version. :-&
> Bug: https://bugs.openjdk.java.net/browse/JDK-8146995
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8146995-named-arguments-in-configure/webrev.01
> /Magnus

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