Build change to support cross architecture modules build

[Kelly O'Hair]

This looks good to me.

-kto

On Mar 16, 2010, at 1:38 PM, Mandy Chung wrote:

> Hi Kelly,
>
> This is the build change we discussed to support building modules  
> when the jdk is built for a target architecture different than that  
> of the host system.  Thanks for the suggestion of the make variable  
> names.
>
> Summary:
> jmod needs to run during the modules build to install modules that  
> depends on the jigsaw module system.  jigsaw has native code and  
> hence we can't use the bootclasspath trick for jmod as used by  
> JAVAC_CMD. This fix defines a new JDK_HOST_PATH that set to  
> OUTPUTDIR by default and several HOST_tool_CMD variables.   
> ALT_JDK_HOST_PATH can be set if needed for cross compilation and it  
> has to be the same version or newer as the built JDK.
>
> Webrev at:
>   http://cr.openjdk.java.net/~mchung/jigsaw/alt-jdk-host-path/
>
> In make/modules/Makefile, thanks for pointing out that  at one point  
> in time, GNU make would exec sh for every line, even if it was a  
> shell comment line.  So I moved the comments  above the target.
>
> Thanks
> Mandy