fsc(1) USER COMMANDS fsc(1)NAMEfsc - Fast offline compiler for the Scala 2 language
SYNOPSISfsc [ <options> ] <source files>
PARAMETERS
<options>
Command line options. See OPTIONS below.
<source files>
One or more source files to be compiled (such as MyClass.scala).
OPTIONS
The offline compiler supports all options of scalac plus the following:
-reset Reset compile server caches.
-shutdown
Shut down the compilation daemon. The daemon attempts to
restart itself as necessary, but sometimes an explicit shutdown
is required. A common example is if jars on the class path have
changed.
-server <hostname:portnumber>
Specify compile server host at port number. Usually this option
is not needed. Note that the hostname must be for a host that
shares the same filesystem.
-J<flag>
Pass <flag> directly to the Java VM for the compilation daemon.
DESCRIPTION
The fsc tool submits Scala compilation jobs to a compilation daemon.
The first time it is executed, the daemon is started automatically. On
subsequent runs, the same daemon can be reused, thus resulting in a
faster compilation. The tool is especially effective when repeatedly
compiling with the same class paths, because the compilation daemon can
reuse a compiler instance.
The compilation daemon is smart enough to flush its cached compiler
when the class path changes. However, if the contents of the class
path change, for example due to upgrading a library, then the daemon
should be explicitly shut down with -shutdown.
Note that the scala script runner will also use the offline compiler by
default, with the same advantages and caveats.
EXAMPLE
The following session shows a typical speed up due to using the offline
compiler.
> fsc-verbose -d /tmp test.scala
...
[Port number: 32834]
[Starting new Scala compile server instance]
[Classpath = ...]
[loaded directory path ... in 692ms]
...
[parsing test.scala]
...
[total in 943ms]
> fsc-verbose -d /tmp test.scala
...
[Port number: 32834]
[parsing test.scala]
...
[total in 60ms]
> fsc-verbose -d /tmp test.scala
...
[Port number: 32834]
[parsing test.scala]
...
[total in 42ms]
> fsc-verbose -shutdown
[Scala compile server exited]
ENVIRONMENT
JAVACMD
Specify the java command to be used for running the Scala code.
Arguments may be specified as part of the environment variable;
spaces, quotation marks, etc., will be passed directly to the
shell for expansion.
JAVA_HOME
Specify JDK/JRE home directory. This directory is used to locate
the java command unless JAVACMD variable set.
JAVA_OPTS
Specify the options to be passed to the java command defined by
JAVACMD.
With Java 1.5 (or newer) one may for example configure the mem‐
ory usage of the JVM as follows: JAVA_OPTS="-Xmx512M -Xms16M
-Xss16M"
With GNU Java one may configure the memory usage of the GIJ as
follows: JAVA_OPTS="--mx512m --ms16m"
EXIT STATUSfsc returns a zero exit status if it succeeds to compile the specified
input files. Non zero is returned in case of failure.
AUTHOR
Written by Martin Odersky and other members of the Scala team.
REPORTING BUGS
Report bugs to https://issues.scala-lang.org/.
COPYRIGHT
This is open-source software, available to you under a BSD-like
license. See accompanying "copyright" or "LICENSE" file for copying
conditions. There is NO warranty; not even for MERCHANTABILITY or FIT‐
NESS FOR A PARTICULAR PURPOSE.
SEE ALSOscala(1), scalac(1), scaladoc(1), scalap(1)version 0.5 March 2012 fsc(1)
