RFR: JDK-8165946: buildjdk logic is incomplete when separate sysroots needed

[Erik Joelsson]

Hello,

Looks ok for now.

I think that for completeness, the --with-build-sysroot option should 
also override a sysroot set by the build-devkit, but it's not that 
important.

/Erik

On 2016-09-13 14:19, Gary Adams wrote:
> When the buildjdk logic was added to the jdk9 build system, it did not 
> completely
> cover the use cases required in the mobile/dev builds. We have been 
> working around
> this issue using a prebuilt macosx buildjdk with the --with-build-jdk 
> autoconf option.
> This is an awkward workaround, because the buildjdk had to be new 
> enough to match the
> requirements of the repos being built. e.g. jdk9 b132 included some 
> newer command line
> option in the jmod and jlink command build step.
>
> This fix is a more permanent solution adding a --with-build-sysroot 
> option to allow
> an explicit reference to the sysroot to use on the build system. A 
> similar call already exists
> when --with-devkit and --with-build-devkit are used.
>
>    JIRA: https://bugs.openjdk.java.net/browse/JDK-8165946
>    Webrev: http://cr.openjdk.java.net/~gadams/8165946/wevrev.00/
>
> This is an interim fix in the mobile/dev repos. Many of the platform 
> specific checks will need to
> be addressed before they can be targeted for the mainstream repos.
>
> Here's an example of how this would be used for an ios-arm64 build :
>
>
> export 
> IOS_SDK_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
> export 
> MACOSX_SDK_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk
> ...
> configure \
> ...
>     --with-sys-root=${IOS_SDK_PATH} \
>     --with-build-sysroot=${MACOSX_SDK_PATH}
>
>