PackageCompiler is a Julia package with three main purposes:
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Creating custom sysimages for reduced latency when working locally with packages that have high startup times.
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Creating "apps" which are a bundle of files including an executable that can be sent and run on other machines without Julia being installed on that machine.
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Creating a relocatable C library bundle form of Julia code.
For installation and usage instructions, see the documentation.
PackageCompiler 2.0 comes with a few breaking changes. Read the upgrade guide here for instructions on how to upgrade to version 2.0.