[8u] RFR (S) 8065215: Print warning summary at end of configure

Aleksey Shipilev shade at redhat.com
Tue Apr 27 09:52:02 UTC 2021

Original RFE:

I would like to backport this 8u build system change to improve error detection during configure. 
This also allows cleaner backport of JDK-8079891.

The patch has a few minor differences:
   *) There is no CUSTOM_SUMMARY_AND_WARNINGS_HOOK, no configure.ac hunk does not apply automatically;
   *) There are no relevant "has been successfully created" blocks in help.m4;
   *) generated-configure.sh is obviously different;

8u webrev:

Testing: 8u build; injecting synthetic AS_MSG_WARN into .m4 files shows the warning at the end of 


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