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NAME

       erlc - Compiler

DESCRIPTION

       The  erlc  program  provides  a  common  way  to  run  all compilers in the Erlang system.
       Depending on the extension of each input file,  erlc  invokes  the  appropriate  compiler.
       Regardless  of which compiler is used, the same flags are used to provide parameters, such
       as include paths and output directory.

       The current working directory, ".", is not included in the  code  path  when  running  the
       compiler.  This  to avoid loading Beam files from the current working directory that could
       potentially be in conflict with  the  compiler  or  the  Erlang/OTP  system  used  by  the
       compiler.

EXPORTS

       erlc flags file1.ext file2.ext...

              Compiles one or more files. The files must include the extension, for example, .erl
              for Erlang source code, or .yrl for Yecc source code. Erlc uses  the  extension  to
              invoke the correct compiler.

GENERALLY USEFUL FLAGS

       The following flags are supported:

         -I <Directory>:
           Instructs the compiler to search for include files in the Directory. When encountering
           an -include or -include_lib directive, the compiler searches for header files  in  the
           following directories:

           * ".", the current working directory of the file server

           * The base name of the compiled file

           * The  directories specified using option -I; the directory specified last is searched
             first

         -o <Directory>:
           The directory where the compiler is to place the output files. Defaults to the current
           working directory.

         -D<Name>:
           Defines a macro.

         -D<Name>=<Value>:
           Defines  a macro with the specified value. The value can be any Erlang term. Depending
           on the platform, the value may need to  be  quoted  if  the  shell  itself  interprets
           certain  characters.  On Unix, terms containing tuples and lists must be quoted. Terms
           containing spaces must be quoted on all platforms.

         -W<Error>:
           Makes all warnings into errors.

         -W<Number>:
           Sets warning level to Number. Defaults to 1. To turn off warnings, use -W0.

         -W:
           Same as -W1. Default.

         -v:
           Enables verbose output.

         -b <Output_type>:
           Specifies the type of output file. Output_type is the same as the  file  extension  of
           the output file, but without the period. This option is ignored by compilers that have
           a single output format.

         -smp:
           Compiles using the SMP emulator. This is mainly  useful  for  compiling  native  code,
           which must be compiled with the same runtime system that it is to be run on.

         -M:
           Produces  a Makefile rule to track header dependencies. The rule is sent to stdout. No
           object file is produced.

         -MMD:
           Generate dependencies as a side-effect. The object file will be  produced  as  normal.
           This option overrides the option -M.

         -MF <Makefile>:
           As  option  -M,  except  that  the  Makefile is written to Makefile. No object file is
           produced.

         -MD:
           Same as -M -MF <File>.Pbeam.

         -MT <Target>:
           In conjunction with option -M or -MF, changes the name of the rule emitted to Target.

         -MQ <Target>:
           As option -MT, except that characters special to make/1 are quoted.

         -MP:
           In conjunction with option -M or -MF, adds a phony target for each dependency.

         -MG:
           In conjunction with option -M or -MF, considers missing headers as generated files and
           adds them to the dependencies.

         --:
           Signals  that  no  more  options  will follow. The rest of the arguments is treated as
           filenames, even if they start with hyphens.

         +<Term>:
           A flag starting with a plus (+) rather than a hyphen is converted to  an  Erlang  term
           and  passed  unchanged  to the compiler. For example, option export_all for the Erlang
           compiler can be specified as follows:

         erlc +export_all file.erl

           Depending on the platform, the value may  need  to  be  quoted  if  the  shell  itself
           interprets  certain  characters.  On  Unix,  terms containing tuples and lists must be
           quoted. Terms containing spaces must be quoted on all platforms.

SPECIAL FLAGS

       The following flags are useful in special situations, such as rebuilding the OTP system:

         -pa <Directory>:
           Appends Directory to the front of the code path in the invoked Erlang  emulator.  This
           can be used to invoke another compiler than the default one.

         -pz <Directory>:
           Appends Directory to the code path in the invoked Erlang emulator.

SUPPORTED COMPILERS

       The following compilers are supported:

         .erl:
           Erlang source code. It generates a .beam file.

           Options  -P,  -E, and -S are equivalent to +'P', +'E', and +'S', except that it is not
           necessary to include the single quotes to protect them from the shell.

           Supported options: -I, -o, -D, -v, -W, -b.

         .S:
           Erlang assembler source code. It generates a .beam file.

           Supported options: same as for .erl.

         .core:
           Erlang core source code. It generates a .beam file.

           Supported options: same as for .erl.

         .yrl:
           Yecc source code. It generates an .erl file.

           Use option -I with the name of a file to use that file as a customized  prologue  file
           (option includefile).

           Supported options: -o, -v, -I, -W.

         .mib:
           MIB for SNMP. It generates a .bin file.

           Supported options: -I, -o, -W.

         .bin:
           A compiled MIB for SNMP. It generates a .hrl file.

           Supported options: -o, -v.

         .rel:
           Script file. It generates a boot file.

           Use  option -I to name directories to be searched for application files (equivalent to
           the path in the option list for systools:make_script/2).

           Supported option: -o.

         .asn1:
           ASN1 file. It creates an .erl, .hrl,  and  .asn1db  file  from  an  .asn1  file.  Also
           compiles the .erl using the Erlang compiler unless option +noobj is specified.

           Supported options: -I, -o, -b, -W.

         .idl:
           IC file. It runs the IDL compiler.

           Supported options: -I, -o.

ENVIRONMENT VARIABLES

         ERLC_EMULATOR:
           The  command  for  starting the emulator. Defaults to erl in the same directory as the
           erlc program itself, or, if it does not exist, erl in any of the directories specified
           in environment variable PATH.

SEE ALSO

       erl(1), compile(3erl), yecc(3erl), snmp(3erl)