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Substrate VM documentation on GitHub (e.g. CONFIGURE.md mentions multiple -H:... options like -H:ReflectionConfigurationResources or -H:ConfigurationFileDirectories. Where can reference documentation of these options be found? GraalVM Reference > Native Image gives just a basic overview.

czerny
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2 Answers2

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Output of native-image --help suggests to call native-image --help-extra which suggests to call 

native-image --expert-options-all

which prints documented list of options: https://gist.github.com/happylynx/ce642816411ee5c98f04fedd80f4c417.

czerny
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Currently, there are different levels for the command help:

  • native-image --help prints default help message with regular options used for generating native image
  • native-image --help-extra prints help on non-standard options, it shows clearly the usage of the next two options
  • native-image --expert-options prints help for more advanced options to use by experts
  • native-image --expert-options-all prints all image building options available, it is clear in the output message that this last command should be used at your own risk

Therefore, you can append a grep expression to one of the four commands above and retrieve the help about a specific command. Here is an example:

native-image --expert-options | grep -A 1 ReflectionConfigurationResources

I am using grep with -A 1 to show one more line in case the first one is truncated

The previous command show the output bellow:

-H:ReflectionConfigurationResources=... Resources describing program elements to be made available for reflection (see ReflectionConfigurationFiles). Default: None
Taha BASRI
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  • @czerny, can you please check one of the given answers so it will be well noticeable for future post viewers. – Taha BASRI Dec 25 '19 at 13:49