RFR: JDK-8256188: Adjust output of make/autoconf/configure

[Christoph Langer]

On Wed, 11 Nov 2020 12:35:07 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The script make/autoconf/configure should give a bit more output in case various errors occur (e.g. missing autoconf).
> The new output in case of missing autoconf adds the PATH; additionally we show on AIX some info on how to install autoconf.
> 
> bash /jdk_6/jdk/jdk/configure
> Runnable configure script is not present
> ...
> Autoconf is not found on the PATH (/opt/freeware/bin:/usr/bin:/etc:/usr/sbin), and AUTOCONF is not set.
> You need autoconf to be able to generate a runnable configure script.
> You might be able to fix this by installing autoconf from the 'AIX Toolbox for Linux Applications' (or compile it from the sources).
> Error: Cannot find autoconf

This looks good to me. Obviously somebody from the build folks needs to review this, too.

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Marked as reviewed by clanger (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1164