P6-LibraryMake

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LibraryMake
------------------

[![OS
tests](https://github.com/retupmoca/P6-LibraryMake/actions/workflows/test.yml/badge.svg)](https://github.com/retupmoca/P6-LibraryMake/actions/workflows/test.yml) [![LinuxNix](https://github.com/retupmoca/P6-LibraryMake/actions/workflows/nixos.yml/badge.svg)](https://github.com/retupmoca/P6-LibraryMake/actions/workflows/nixos.yml)

An attempt to simplify building native code for a
[Raku](https://raku.org) module. It should work on all platforms, as long as 
specified tools are available locally.

This is effectively a small configure script for a Makefile. It will allow you to
use the same tools to build your native code that were used to build Raku itself.

Typically, this will be used in both `Build.rakumod` (to support installation using a
module manager), and in a standalone `Configure.raku` script in the `src` directory
(to support standalone testing/building). Note that if you need additional
custom configure code, you will currently need to add it to both your `Build.rakumod`
and to your `Configure.raku`.

Example Usage
-------------

The below files are examples of what you would write in your own project.
The `src` directory is merely a convention, and the `Makefile.in` will likely be
significantly different in your own project.

/Build.rakumod

```raku
    use LibraryMake;
    use Shell::Command;

my $libname = 'chelper';

class Build {
        method build($dir) {
            my %vars = get-vars($dir);
            %vars{$libname} = $*VM.platform-library-name($libname.IO);
            mkdir "$dir/resources" unless "$dir/resources".IO.e;
            mkdir "$dir/resources/libraries" unless "$dir/resources/libraries".IO.e;
            process-makefile($dir, %vars);
            my $goback = $*CWD;
            chdir($dir);
            shell(%vars<MAKE>);
            chdir($goback);
        }
    }
```

`src/Configure.raku`

```raku
    #!/usr/bin/env raku
    use LibraryMake;

my $libname = 'chelper';
    my %vars = get-vars('.');
    %vars{$libname} = $*VM.platform-library-name($libname.IO);
    mkdir "resources" unless "resources".IO.e;
    mkdir "resources/libraries" unless "resources/libraries".IO.e;
    process-makefile('.', %vars);
    shell(%vars<MAKE>);

say "Configure completed! You can now run '%vars<MAKE>' to build lib$libname.";
```

`src/Makefile.in` (Make sure you use TABs and not spaces!)

```Makefile
    .PHONY: clean test

all: %DESTDIR%/resources/libraries/%chelper%

clean:
        -rm %DESTDIR%/resources/libraries/%chelper% %DESTDIR%/*.o

%DESTDIR%/resources/libraries/%chelper%: chelper%O%
        %LD% %LDSHARED% %LDFLAGS% %LIBS% %LDOUT%%DESTDIR%/resources/libraries/%chelper% chelper%O%

chelper%O%: src/chelper.c
        %CC% -c %CCSHARED% %CCFLAGS% %CCOUT% chelper%O% src/chelper.c

test: all
        prove -e "raku -Ilib" t
```

/lib/My/Module.rakumod

```raku
    # ...

use NativeCall;
    use LibraryMake;

constant CHELPER = %?RESOURCES<libraries/chelper>.absolute;

sub foo() is native( CHELPER ) { * };
```

Include the following section in your META6.json:

```JSON
    "resources" : [
        "library/chelper"
    ],
    "depends" : [
        "LibraryMake"
    ]
```

Functions
---------

### sub get-vars

```
sub get-vars(
    Str $destfolder
) returns Hash
```

Returns configuration variables. Effectively just a wrapper around $*VM.config, as the VM config variables are different for each backend VM.

### sub process-makefile

```
sub process-makefile(
    Str $folder, 
    %vars
) returns Mu
```

Takes '$folder/Makefile.in' and writes out '$folder/Makefile'. %vars should be the result of `get-vars` above.

### sub make

```
sub make(
    Str $folder, 
    Str $destfolder
) returns Mu
```

Calls `get-vars` and `process-makefile` for you to generate '$folder/Makefile', then runs your system's 'make' to build it.

### sub build-tools-installed()
```
sub build-tools-installed(
) returns Bool
```

Returns True if the configured compiler(CC), linker(LD) and make program(MAKE) have been installed on this sytem system.

## Change log

* [1.0.4](https://github.com/retupmoca/P6-LibraryMake/releases/tag/v1.0.4) Reinstates macOS test and eliminates test that fails in it.
* [1.0.3](https://github.com/retupmoca/P6-LibraryMake/releases/tag/v1.0.3) Fixes files included in zef.
* [1.0.2](https://github.com/retupmoca/P6-LibraryMake/releases/tag/v1.0.2) Fixes test error when `prove6` is installed as test runner and
 picked up by `zef`.
* [1.0.1](https://github.com/retupmoca/P6-LibraryMake/releases/tag/v1.0.1) Checks that the directory it's writing is writable, errors if it
 does not
* [1.0.0](https://github.com/retupmoca/P6-LibraryMake/releases/tag/v1.0.0
) Original version, newly released to the zef ecosystem.

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