how to use --target

[hanxiao34]

I saw the parameter -- target. I thought it could compile software packages on different platforms on a set of environment. But when I execute -- target = windows-amd64 on Linux, it prompts

Caused by: java.nio.file.NoSuchFileException: /home/hx/graalvm/graalvm-ce-java11-21.3.0/lib/svm/clibraries/windows-amd64

and then, i copy windows-amd64 into there from window sdk and try again ,it prompts:

Error: Substitution target for com.oracle.svm.core.jdk.Target_java_io_WinNTFileSystem is not loaded. Use field onlyWith in the TargetClass annotation to make substitution only active when needed.
com.oracle.svm.core.util.UserError$UserException: Substitution target for com.oracle.svm.core.jdk.Target_java_io_WinNTFileSystem is not loaded. Use field onlyWith in the TargetClass annotation to make substitution only active when needed.
at com.oracle.svm.core.util.UserError.abort(UserError.java:73)
at com.oracle.svm.hosted.substitute.AnnotationSubstitutionProcessor.findTargetClass(AnnotationSubstitutionProcessor.java:945)
at com.oracle.svm.hosted.substitute.AnnotationSubstitutionProcessor.handleClass(AnnotationSubstitutionProcessor.java:288)
at com.oracle.svm.hosted.substitute.AnnotationSubstitutionProcessor.init(AnnotationSubstitutionProcessor.java:266)
at com.oracle.svm.hosted.NativeImageGenerator.createDeclarativeSubstitutionProcessor(NativeImageGenerator.java:912)
at com.oracle.svm.hosted.NativeImageGenerator.setupNativeImage(NativeImageGenerator.java:839)
at com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:527)
at com.oracle.svm.hosted.NativeImageGenerator.run(NativeImageGenerator.java:488)
at com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:403)
at com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:569)
at com.oracle.svm.hosted.NativeImageGeneratorRunner.main(NativeImageGeneratorRunner.java:122)
at com.oracle.svm.hosted.NativeImageGeneratorRunner$JDK9Plus.main(NativeImageGeneratorRunner.java:599)

[rodrigar-mx]

Hi @hanxiao34. Cross compilation between different OS is not possible for the moment. There is already an open issue about that #407. Possible alternatives are using VMs or docker images.
--target option is used, for example, for building native images for mobile apps in gluon project https://github.com/gluonhq/gluon-samples.

[hanxiao34]

OK，tkx！