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LUAC(1)                                                                LUAC(1)



NAME
       luac - Lua compiler

SYNOPSIS
       luac [ options ] [ filenames ]

DESCRIPTION
       luac  is  the  Lua  compiler.  It translates programs written in the Lua programming language into binary files
       that can be later loaded and executed.

       The main advantages of precompiling chunks are: faster loading, protecting source  code  from  accidental  user
       changes, and off-line syntax checking.

       Pre-compiling  does  not imply faster execution because in Lua chunks are always compiled into bytecodes before
       being executed.  luac simply allows those bytecodes to be saved in a file for later execution.

       Pre-compiled chunks are not necessarily smaller than the corresponding source.  The main goal in  pre-compiling
       is faster loading.

       The  binary files created by luac are portable only among architectures with the same word size and byte order.

       luac produces a single output file containing the bytecodes for all source files given.  By default, the output
       file is named luac.out, but you can change this with the -o option.

       In  the  command  line,  you  can  mix text files containing Lua source and binary files containing precompiled
       chunks.  This is useful to combine several precompiled chunks, even from different (but compatible)  platforms,
       into a single precompiled chunk.

       You can use '-' to indicate the standard input as a source file and '--' to signal the end of options (that is,
       all remaining arguments will be treated as files even if they start with '-').

       The internal format of the binary files produced by luac is likely to change when  a  new  version  of  Lua  is
       released.  So, save the source files of all Lua programs that you precompile.


OPTIONS
       Options must be separate.

       -l     produce  a  listing  of the compiled bytecode for Lua's virtual machine.  Listing bytecodes is useful to
              learn about Lua's virtual machine.  If no files are given, then luac loads luac.out and lists  its  con-
              tents.

       -o file
              output to file, instead of the default luac.out.  (You can use '-' for standard output, but not on plat-
              forms that open standard output in text mode.)  The output file may be a source file because  all  files
              are loaded before the output file is written.  Be careful not to overwrite precious files.

       -p     load files but do not generate any output file.  Used mainly for syntax checking and for testing precom-
              piled chunks: corrupted files will probably generate errors when loaded.  Lua always performs a thorough
              integrity  test  on precompiled chunks.  Bytecode that passes this test is completely safe, in the sense
              that it will not break the interpreter.  However, there is no guarantee that  such  code  does  anything
              sensible.   (None can be given, because the halting problem is unsolvable.)  If no files are given, then
              luac loads luac.out and tests its contents.  No messages are displayed if the file passes the  integrity
              test.

       -s     strip debug information before writing the output file.  This saves some space in very large chunks, but
              if errors occur when running a stripped chunk, then the error messages may not contain the full informa-
              tion they usually do.  For instance, line numbers and names of local variables are lost.

       -v     show version information.

FILES
       luac.out       default output file

SEE ALSO
       lua(1)
       http://www.lua.org/

DIAGNOSTICS
       Error messages should be self explanatory.

AUTHORS
       L. H. de Figueiredo, R. Ierusalimschy and W. Celes



                         $Date: 2006/01/06 16:03:34 $                  LUAC(1)