JDK-8055856: checkdeps build target doesn't work for cross-compilation builds JDK-8056113: [build] tools.jar missing modules.xml
Webrev at: http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8055856/ This patch fixes a few things about modules.xml 1. jdeps is invoked at build time to verify the module boundaries. For cross-compilation, it has to run on the host system. jdeps is added in the langtools interim build so that it can run with the BOOT_JDK. jdeps is also modified to support a system property to specify the path to modules.xml generated later. 2. The generated modules.xml is solely for jdeps to use until the module system is in place. The build tool takes the modules.xml in the top repo and generates a new file to include the module membership for jdeps to use. It is better to name it differently to jdeps-modules.xml to avoid confusion as Magnus suggests. 3. main-jars is missing the dependency of modules-xml target and thus jdeps in the JDK images fails. To help catch this issue, jdeps now throws an exception if jdeps-modules.xml is missing. thanks Mandy
