erlc - Online in the Cloud

PROGRAM:

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

EXPORTS

erlc flags file1.ext file2.ext...

Erlc 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 specified 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 the -I option. The directory specified last is
searched first.

-o directory:
The directory where the compiler should place the output files. If not specified,
output files will be placed in the current working directory.

-Dname:
Defines a macro.

-Dname=value:
Defines a macro with the given 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 which contain tuples and list must be quoted. Terms which
contain spaces must be quoted on all platforms.

-Werror:
Makes all warnings into errors.

-Wnumber:
Sets warning level to number. Default is 1. Use -W0 to turn off warnings.

-W:
Same as -W1. Default.

-v:
Enables verbose output.

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

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

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

-MF Makefile:
Like the -M option above, 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 -M or -MF, change the name of the rule emitted to Target.

-MQ Target:
Like the -MT option above, except that characters special to make(1) are quoted.

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

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

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

+term:
A flag starting with a plus ('+') rather than a hyphen will be converted to an Erlang
term and passed unchanged to the compiler. For instance, the export_all option 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 which contain tuples and list must be
quoted. Terms which contain spaces must be quoted on all platforms.

SPECIAL FLAGS

The flags in this section are useful in special situations such as re-building 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

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

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

Supported options: -o, -v, -I, -W (see above).

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

Supported options: -o.

.asn1:
ASN1 file.

Creates an .erl, .hrl, and .asn1db file from an .asn1 file. Also compiles the .erl
using the Erlang compiler unless the +noobj options is given.

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

.idl:
IC file.

Runs the IDL compiler.

Supported options: -I, -o.

ENVIRONMENT VARIABLES

ERLC_EMULATOR:
The command for starting the emulator. Default is erl in the same directory as the
erlc program itself, or if it doesn't exist, erl in any of the directories given in
the PATH environment variable.

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