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# make (tools v4.1.4)

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A Make Utility for Erlang

The module `make` provides a set of functions similar to the UNIX type `Make` functions.

## Emakefile

`make:all/0,1` and `make:files/1,2` first looks for `{emake, Emake}` in options, then in the current working directory for a file named `Emakefile`. If present `Emake` should contain elements like this:

    Modules.
    {Modules,Options}.

`Modules` is an atom or a list of atoms. It can be

- a module name, for exmaple, `file1`
- a module name in another directory, for exmaple, `'../foo/file3'`
- a set of modules specified with a wildcards, for exmaple, `'file*'`
- a wildcard indicating all modules in current directory, that is: `'*'`
- a list of any of the above, for exmaple, `['file*','../foo/file3','File4']`

`Options` is a list of compiler options.

`Emakefile` is read from top to bottom. If a module matches more than one entry, the first match is used. For example, the following `Emakefile` means that `file1` should be compiled with the options `[debug_info,{i,"../foo"}]`, while all other files in the current directory should be compiled with only the `debug_info` flag.

    {'file1',[debug_info,{i,"../foo"}]}.
    {'*',[debug_info]}.

## See Also

The Compiler Application

## Summary

### Functions

all()

Equivalent to `all([])`.

all(Options)

This function determines the set of modules to compile and the compile options to use, by first looking for the `emake` make option, if not present reads the configuration from a file named `Emakefile` (see below). If no such file is found, the set of modules to compile defaults to all modules in the current working directory.

files(ModFiles)

Equivalent to `files(ModFiles, [])`.

files(ModFiles, Options)

This function does exactly the same thing as `all/0,1`, but for the specified `ModFiles`, which is a list of module or file names.

## Functions

# all()

    -spec all() -> up_to_date | error.

Equivalent to `all([])`.

# all(Options)

    -spec all(Options) -> up_to_date | error
                 when
                     Options :: [Option],
                     Option :: noexec | load | netload | {emake, Emake} | compile:option(),
                     Emake :: [EmakeElement],
                     EmakeElement :: Modules | {Modules, [compile:option()]},
                     Modules :: atom() | [atom()].

This function determines the set of modules to compile and the compile options to use, by first looking for the `emake` make option, if not present reads the configuration from a file named `Emakefile` (see below). If no such file is found, the set of modules to compile defaults to all modules in the current working directory.

Traversing the set of modules, it then recompiles every module for which at least one of the following conditions apply:

- there is no object file, or
- the source file has been modified since it was last compiled, or,
- an include file has been modified since the source file was last compiled.

As a side effect, the function prints the name of each module it tries to compile. If compilation fails for a module, the make procedure stops and `error` is returned.

`Options` is a list of options for `make` and the Erlang compiler. The following `make` options exist:

- `noexec` No execution mode. Just prints the name of each module that needs to be compiled.
- `load` Load mode. Loads all recompiled modules.
- `netload` Net load mode. Loads all recompiled modules on all known nodes.
- `{emake, Emake}` Rather than reading the `Emakefile` specify configuration explicitly.

All items in `Options` that are not make options are assumed to be compiler options and are passed as-is to `compile:file/2`.

# files(ModFiles)

    -spec files(ModFiles) -> up_to_date | error
                   when ModFiles :: [(Module :: module()) | (File :: file:filename())].

Equivalent to `files(ModFiles, [])`.

# files(ModFiles, Options)

    -spec files(ModFiles, Options) -> up_to_date | error
                   when
                       ModFiles :: [(Module :: module()) | (File :: file:filename())],
                       Options :: [Option],
                       Option :: noexec | load | netload | compile:option().

This function does exactly the same thing as `all/0,1`, but for the specified `ModFiles`, which is a list of module or file names.

The file extension `.erl` can be omitted.

The `Emakefile` (if it exists) in the current directory is searched for compiler options for each module. If a given module does not exist in `Emakefile` or if `Emakefile` does not exist, the module is still compiled.