RFR: JDK-8140593: Add configure parameter for devkit for the build compiler

[Magnus Ihse Bursie]

On 2015-10-28 11:14, Erik Joelsson wrote:
> In Jake, when crosscompiling, we need to build a subset of the jdk, 
> including hotspot, to be able to run jmod and jlink. Currently, the 
> build compiler is just found on the system so such a configuration 
> requires the build system to basically be able to compile the jdk 
> without a devkit. The idea with devkits was partly to avoid this. The 
> solution would be to add another configure parameter that defines a 
> devkit for the build compiler.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8140593
> Webrev: http://cr.openjdk.java.net/~erikj/8140593/webrev.01/

I'm getting slightly confused on how devkits really propagate their 
information to configure. I think we're kind of missing a piece here, 
we're giving configure clues on where to look but we still to not 
explicitely point to e.g. the complete (relative) compiler binary path 
in the devkit. Otoh, that's not really part of your fix and if it works, 
I'm okay with it.

One nitpick:

+ $SED -e "s/^DEVKIT_/BUILD_DEVKIT_/g" \
+ -e "s/\$DEVKIT_ROOT/\$BUILD_DEVKIT_ROOT/g" \


I believe the last line here is unnecessary.

/Magnus