Description
Amusingly, -Xprint is mentioned in the notes section at the bottom of -X, but not actually in the option listing:
Phases are a list of names, ids, or ranges of ids: -Xprint:parser,typer,5-10
And of course, it'd be ever so helpful to know how to find that list of phase names from right here on the command line without intermediate Googling step
$ scalac -version
Scala compiler version 2.13.0 -- Copyright 2002-2019, LAMP/EPFL and Lightbend, Inc.
$ scalac -X
Usage: scalac <options> <source files>
Available advanced options:
-Xcheckinit Wrap field accessors to throw an exception on uninitialized access.
-Xdev Indicates user is a developer - issue warnings about anything which seems amiss
-Xdisable-assertions Generate no assertions or assumptions.
-Xelide-below <n> Calls to @elidable methods are omitted if method priority is lower than argument
-Xgenerate-phase-graph <file> Generate the phase graphs (outputs .dot files) to fileX.dot.
-Xlint:<warnings> Enable recommended warnings
-Xmacro-settings:<option> Custom settings for macros.
-Xmain-class <path> Class for manifest's Main-Class entry (only useful with -d <jar>)
-Xmaxerrs <n> Maximum errors to print
-Xmaxwarns <n> Maximum warnings to print
-Xmigration:<version> Warn about constructs whose behavior may have changed since version.
-Xmixin-force-forwarders:<mode> Generate forwarder methods in classes inhering concrete methods from traits. Default: `true`, `help` to list choices.
-Xno-forwarders Do not generate static forwarders in mirror classes.
-Xno-patmat-analysis Don't perform exhaustivity/unreachability analysis. Also, ignore @switch annotation.
-Xno-uescape Disable handling of \u unicode escapes.
-Xnojline Do not use JLine for editing.
-Xplugin:<paths> Load a plugin from each classpath.
-Xplugin-disable:<plugin> Disable plugins by name.
-Xplugin-list Print a synopsis of loaded plugins.
-Xplugin-require:<plugin> Abort if a named plugin is not loaded.
-Xpluginsdir <path> Path to search for plugin archives.
-Xprompt Display a prompt after each error (debugging option).
-Xreporter <classname> Specify a custom reporter for compiler messages.
-Xresident Compiler stays resident: read source filenames from standard input.
-Xscript <object> Treat the source file as a script and wrap it in a main method.
-Xsource:<version> Treat compiler input as Scala source for the specified version, see scala/bug#8126.
-Xsource-reader <classname> Specify a custom method for reading source files.
-Xverify Verify generic signatures in generated bytecode.
-Xxml:<propertys> Configure XML parsing.
Deprecated settings:
-Xexperimental Former graveyard for language-forking extensions.
deprecated: Not used since 2.13.
-Xfuture Replaced by -Xsource.
deprecated: Not used since 2.13.
-- Note --
Boolean settings are false unless set: -Xdev -Xcheck-init:true -Xprompt:false
Multi-valued settings are comma-separated: -Xlint:infer-any,unused,-missing-interpolator
Phases are a list of names, ids, or ranges of ids: -Xprint:parser,typer,5-10 -Ylog:-4
Use _ to enable all: -language:_ -Xprint:_