Go to main content

man pages section 1: User Commands

Exit Print View

Updated: Thursday, June 13, 2019
 
 

erlc (1)

Name

erlc - Compiler

Synopsis

Please see following description for synopsis

Description

erlc(1)                          User Commands                         erlc(1)



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  exten-
              sion, for example, .erl for Erlang source code, or .yrl for Yecc
              source code. Erlc uses the extension to invoke the correct  com-
              piler.

GENERALLY USEFUL FLAGS
       The following flags are supported:

         -I <Directory>:
           Instructs  the  compiler  to search for include files in the Direc-
           tory. 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 speci-
             fied 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  compil-
           ing  native code, which must be compiled with the same runtime sys-
           tem 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  exam-
           ple,  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 contain-
           ing 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 rebuild-
       ing 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 custom-
           ized 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  sys-
           tools: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(3), yecc(3), snmp(3)



Ericsson AB                        erts 10.0                           erlc(1)