RFR: JDK-8033119 Improve and document boot-jdk.m4

[Mike Duigou]

Looks like good cleanup.

Could some of the implementation of BOOTJDK_CHECK_TOOL_IN_BOOTJDK be replaced with a call to AC_CHECK_PROG? (It may not be worth the trouble).

Mike

On Jan 29 2014, at 04:06 , Magnus Ihse Bursie <magnus.ihse.bursie at oracle.com> wrote:

> Bug: https://bugs.openjdk.java.net/browse/JDK-8033119
> 
> The file boot-jdk.m4 is in charge of locating and verifying the Boot JDK.
> 
> This bug covers several independent fixes of that file:
> * Document the logic of how we discover a suitable Boot JDK.
> * Update to allow building with JDK 9.
> * Improve detection on macosx by preferring the official method.
> * Allow overriding of individual tools normally found in the Boot JDK (e.g. JAVA, JAVAC)
> * Update list of tools: RMIC is not used anymore, JARSIGNER was not tested for properly.
> 
> WebRev: http://cr.openjdk.java.net/~ihse/JDK-8033119-improve-and-document-boot-jdk/webrev.01
> 
> /Magnus