eclipse的java编译器命令行

汗，刚刚突然发现我的javac是eclipse的java编译器。留念下。

stlxv@stlxvcomputer:~$ javac -version
Eclipse Java Compiler v_686_R32x, 3.2.2 release, Copyright IBM Corp 2000, 2006.
这东西原名叫ecj，不过我也不知道是哪里冒出来的。算了，这个东西编译速度挺快的，我觉得。

stlxv@stlxvcomputer:~$ update-alternatives --display javac
javac - status is auto.
link currently points to /usr/bin/ecj
/usr/lib/jvm/java-6-sun/bin/javac - priority 63
slave javac.1.gz: /usr/lib/jvm/java-6-sun/man/man1/javac.1.gz
/usr/bin/ecj - priority 143
slave javac.1.gz: /usr/share/man/man1/ecj.1.gz
Current `best' version is /usr/bin/ecj.
可编译1.3~1.6的代码。
stlxv@stlxvcomputer:~$ javac
Eclipse Java Compiler v_686_R32x, 3.2.2 release
Copyright IBM Corp 2000, 2006. All rights reserved.

Usage: <options> <source files | directories>
If directories are specified, then their source contents are compiled.
Possible options are listed below. Options enabled by default are prefixed
with '+'.

Classpath options:
    -cp -classpath <directories and zip/jar files separated by :>
                       specify location for application classes and sources.
                       Each directory or file can specify access rules for
                       types between '[' and ']' (e.g. [-X] to forbid
                       access to type X, [~X] to discourage access to type X,
                       [+p/X:-p/*] to forbid access to all types in package p
                       but allow access to p/X)
    -bootclasspath <directories and zip/jar files separated by :>
                       specify location for system classes. Each directory or
                       file can specify access rules for types between '['
                       and ']'
    -sourcepath <directories and zip/jar files separated by :>
                       specify location for application sources. Each directory
                       or file can specify access rules for types between '['
                       and ']'.
                       .class files created from source files contained in a
                       jar file are put in the user.dir folder in case no
                       destination directory is specified.
    -extdirs <directories separated by :>
                       specify location for extension zip/jar files
    -endorseddirs <directories separated by :>
                       specify location for endorsed zip/jar files
    -d <dir>           destination directory (if omitted, no directory is
                       created)
    -d none            generate no .class files
    -encoding <enc>    specify custom encoding for all sources. Each
                       file/directory can override it when suffixed with
                       '['<enc>']' (e.g. X.java[utf8])

Compliance options:
    -1.3               use 1.3 compliance level (implicit -source 1.3
                       -target 1.1)
    -1.4             + use 1.4 compliance level (implicit -source 1.3
                       -target 1.2)
    -1.5               use 1.5 compliance level (implicit -source 1.5
                       -target 1.5)
    -1.6               use 1.6 compliance level (implicit -source 1.6
                       -target 1.6)
    -source <version>  set source level: 1.3 to 1.6 (or 5, 5.0, 6 or 6.0)
    -target <version>  set classfile target level: 1.1 to 1.6 (or 5, 5.0, 6 or
                       6.0)

Warning options:
    -deprecation     + deprecation outside deprecated code
    -nowarn            disable all warnings
    -warn:none         disable all warnings
    -warn:<warnings separated by ,>    enable exactly the listed warnings
    -warn:+<warnings separated by ,>   enable additional warnings
    -warn:-<warnings separated by ,>   disable specific warnings
      allDeprecation       deprecation including inside deprecated code
      allJavadoc           invalid or missing javadoc
      assertIdentifier   + 'assert' used as identifier
      boxing               autoboxing conversion
      charConcat         + char[] in String concat
      conditionAssign      possible accidental boolean assignment
      constructorName    + method with constructor name
      dep-ann              missing @Deprecated annotation
      deprecation        + deprecation outside deprecated code
      discouraged        + use of types matching a discouraged access rule
      emptyBlock           undocumented empty block
      enumSwitch           incomplete enum switch
      fallthrough          possible fall-through case
      fieldHiding          field hiding another variable
      finalBound           type parameter with final bound
      finally            + finally block not completing normally
      forbidden          + use of types matching a forbidden access rule
      hiding               macro for fieldHiding, localHiding, typeHiding and
                           maskedCatchBlock
      incomplete-switch    same as enumSwitch
      indirectStatic       indirect reference to static member
      intfAnnotation     + annotation type used as super interface
      intfNonInherited   + interface non-inherited method compatibility
      javadoc              invalid javadoc
      localHiding          local variable hiding another variable
      maskedCatchBlock   + hidden catch block
      nls                  string literal lacking non-nls tag //$NON-NLS-<n>$
      noEffectAssign     + assignment without effect
      null                 missing or redundant null check
      over-ann             missing @Override annotation
      paramAssign          assignment to a parameter
      pkgDefaultMethod   + attempt to override package-default method
      raw                  usage of raw type
      semicolon            unnecessary semicolon, empty statement
      serial             + missing serialVersionUID
      specialParamHiding   constructor or setter parameter hiding another field
      static-access        macro for indirectStatic and staticReceiver
      staticReceiver     + non-static reference to static member
      suppress           + enable @SuppressWarnings
      synthetic-access     same as syntheticAccess
      syntheticAccess      synthetic access for innerclass
      tasks(<tags separated by |>) tasks identified by tags inside comments
      typeHiding         + type parameter hiding another type
      unchecked          + unchecked type operation
      unnecessaryElse      unnecessary else clause
      unqualified-field-access same as unqualifiedField
      unqualifiedField     unqualified reference to field
      unused               macro for unusedArgument, unusedImport, unusedLabel,
                               unusedLocal, unusedPrivate and unusedThrown
      unusedArgument       unread method parameter
      unusedImport       + unused import declaration
      unusedLabel        + unused label
      unusedLocal        + unread local variable
      unusedPrivate      + unused private member declaration
      unusedThrown         unused declared thrown exception
      uselessTypeCheck     unnecessary cast/instanceof operation
      varargsCast        + varargs argument need explicit cast
      warningToken       + unhandled warning token in @SuppressWarnings

Debug options:
    -g[:lines,vars,source] custom debug info
    -g:lines,source  + both lines table and source debug info
    -g                 all debug info
    -g:none            no debug info
    -preserveAllLocals preserve unused local vars for debug purpose

Ignored options:
    -J<option>         pass option to virtual machine (ignored)
    -X<option>         specify non-standard option (ignored)
    -X                 print non-standard options and exit (ignored)
    -O                 optimize for execution time (ignored)

Advanced options:
    @<file>            read command line arguments from file
    -maxProblems <n>   max number of problems per compilation unit (100 by
                       default)
    -log <file>        log to a file. If the file extension is '.xml', then
                       the log will be a xml file.
    -proceedOnError    do not stop at first error, dumping class files with
                       problem methods
    -verbose           enable verbose output
    -referenceInfo     compute reference info
    -progress          show progress (only in -log mode)
    -time              display speed information
    -noExit            do not call System.exit(n) at end of compilation (n==0
                       if no error)
    -repeat <n>        repeat compilation process <n> times for perf analysis
    -inlineJSR         inline JSR bytecode (implicit if target >= 1.5)
    -enableJavadoc     consider references in javadoc
    -Xemacs            used to enable emacs-style output

    -? -help           print this help message
    -v -version        print compiler version
    -showversion       print compiler version and continue