Cross-compiling and the gen* native build tools (original) (raw)

Magnus Ihse Bursie magnus.ihse.bursie at oracle.com
Mon Feb 3 14:13:23 UTC 2014

I just noticed this when replying to a mail to Volker, but I think this is worth a thread on it's own.

There are three very similar build helpers that are compiler with BUILD_CC, i.e. the compiler for the build (not target) platform. They are:

jdk/src/solaris/native/sun/nio/fs/genUnixConstants.c jdk/src/solaris/native/sun/nio/fs/genSolarisConstants.c jdk/src/share/native/sun/nio/ch/genSocketOptionRegistry.c

They are very similar in that they pick up (build) platform constants and turn them into Java constants.

This does not work for cross-compilation, so we have closed sources hard-coded versions for these platform we internally cross-compile to.

This does not strike me as a neat solution. You can't add a new target to cross compile to without mimicking our internal closed code structure. You are always needed to provide a build platform compiler, even though the results are not supposed to change for the platform you're building for. (If it were, then the resulting code would not be possible to run on any other platform then your own, i.e. it wouldn't be constants).

I think we should do something similar to with the X11 wrappers, and hard-code the values, with a possible, optional, verification step.

/Magnus

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