问题
How can I find all of the flags for the latest scalac version? After googling for hours I have found only outdated docs. (for example, they don't even mention "-feature" flag).
Is there any way to obtain the list of compiler flags with descriptions from scalac, or anything else?
回答1:
The closest I have been able to find is the relevant source files for the compiler. Unfortunately the options are spread among several files. As of this writing, it breaks down like so:
- StandardScalaSettings (for basic flags)
- ScalaSettings (for advanced flags)
These will of course be for the current development version of the compiler, so if you want options for a specific version of scalac, you'll need to use the "branch" drop-down menu to view the correct version tag.
回答2:
Edit: Documentation for Scala Compiler Options has been posted.
Most of us get by with scalac -help, scalac -X and scalac -Y.
Don't forget to scala -help, too.
Edit: sbt user can do the usual:
> set scalacOptions in Compile += "-X"
> compile
[snip]
[info] -Xcheck-null Warn upon selection of nullable reference.
[info] -Xcheckinit Wrap field accessors to throw an exception on uninitialized access.
[info] -Xdisable-assertions Generate no assertions or assumptions.
[info] -Xdivergence211 Turn on the 2.11 behavior of implicit divergence not terminating recursive implicit searches (SI-7291).
[info] -Xelide-below <n> Calls to @elidable methods are omitted if method priority is lower than argument
[info] -Xexperimental Enable experimental extensions.
[info] -Xfatal-warnings Fail the compilation if there are any warnings.
[snip]
At least the man page was updated recently:
https://issues.scala-lang.org/browse/SI-7824
来源：https://stackoverflow.com/questions/18601372/how-can-i-find-a-description-of-scala-compiler-flags-options