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/ vendor/mruby/doc/guides/compile.md

Compile

mruby uses Rake to compile and cross-compile all libraries and binaries.

Prerequisites

To compile mruby out of the source code you need the following tools:

Optional:

Usage

Inside of the root directory of the mruby source a file exists called build_config.rb. This file contains the build configuration of mruby and looks like this for example:

MRuby::Build.new do |conf|
  toolchain :gcc
end

All tools necessary to compile mruby can be set or modified here. In case you want to maintain an additional build_config.rb you can define a customized path using the $MRUBY_CONFIG environment variable.

To compile just call ./minirake inside of the mruby source root. To generate and execute the test tools call ./minirake test. To clean all build files call ./minirake clean. To see full command line on build, call ./minirake -v.

Build Configuration

Inside of the build_config.rb the following options can be configured based on your environment.

Toolchains

The mruby build system already contains a set of toolchain templates which configure the build environment for specific compiler infrastructures.

GCC

Toolchain configuration for the GNU C Compiler.

toolchain :gcc

clang

Toolchain configuration for the LLVM C Compiler clang. Mainly equal to the GCC toolchain.

toolchain :clang

Visual Studio 2010, 2012 and 2013

Toolchain configuration for Visual Studio on Windows. If you use the Visual Studio Command Prompt, you normally do not have to specify this manually, since it gets automatically detected by our build process.

toolchain :visualcpp

Android

Toolchain configuration for Android.

toolchain :android

Requires the custom standalone Android NDK and the toolchain path in ANDROID_STANDALONE_TOOLCHAIN.

Binaries

It is possible to select which tools should be compiled during the compilation process. The following tools can be selected:

To select them declare conf.gem as follows:

conf.gem "#{root}/mrbgems/mruby-bin-mruby"
conf.gem "#{root}/mrbgems/mruby-bin-mirb"

File Separator

Some environments require a different file separator character. It is possible to set the character via conf.file_separator.

conf.file_separator = '/'

C Compiler

Configuration of the C compiler binary, flags and include paths.

conf.cc do |cc|
  cc.command = ...
  cc.flags = ...
  cc.include_paths = ...
  cc.defines = ...
  cc.option_include_path = ...
  cc.option_define = ...
  cc.compile_options = ...
end

C Compiler has header searcher to detect installed library.

If you need a include path of header file use search_header_path:

# Searches ```iconv.h```.
# If found it will return include path of the header file.
# Otherwise it will return nil .
fail 'iconv.h not found' unless conf.cc.search_header_path 'iconv.h'

If you need a full file name of header file use search_header:

# Searches ```iconv.h```.
# If found it will return full path of the header file.
# Otherwise it will return nil .
iconv_h = conf.cc.search_header 'iconv.h'
print "iconv.h found: #{iconv_h}\n"

Header searcher uses compiler's include_paths by default. When you are using GCC toolchain (including clang toolchain since its base is gcc toolchain) it will use compiler specific include paths too. (For example /usr/local/include, /usr/include)

If you need a special header search paths define a singleton method header_search_paths to C compiler:

def conf.cc.header_search_paths
  ['/opt/local/include'] + include_paths
end

Linker

Configuration of the Linker binary, flags and library paths.

conf.linker do |linker|
  linker.command = ...
  linker.flags = ...
  linker.flags_before_libraries = ...
  linker.libraries = ...
  linker.flags_after_libraries = ...
  linker.library_paths = ....
  linker.option_library = ...
  linker.option_library_path = ...
  linker.link_options = ...
end

Archiver

Configuration of the Archiver binary and flags.

conf.archiver do |archiver|
  archiver.command = ...
  archiver.archive_options = ...
end

Parser Generator

Configuration of the Parser Generator binary and flags.

conf.yacc do |yacc|
  yacc.command = ...
  yacc.compile_options = ...
end

GPerf

Configuration of the GPerf binary and flags.

conf.gperf do |gperf|
  gperf.command = ...
  gperf.compile_options = ...
end

File Extensions

conf.exts do |exts|
  exts.object = ...
  exts.executable = ...
  exts.library = ...
end

Mrbgems

Integrate GEMs in the build process.

# Integrate GEM with additional configuration
conf.gem 'path/to/gem' do |g|
  g.cc.flags << ...
end

# Integrate GEM without additional configuration
conf.gem 'path/to/another/gem'

See doc/mrbgems/README.md for more option about mrbgems.

Mrbtest

Configuration Mrbtest build process.

If you want mrbtest.a only, You should set conf.build_mrbtest_lib_only

conf.build_mrbtest_lib_only

Bintest

Tests for mrbgem tools using CRuby. To have bintests place *.rb scripts to bintest/ directory of mrbgems. See mruby-bin-*/bintest/*.rb if you need examples. If you want a temporary files use tempfile module of CRuby instead of /tmp/.

You can enable it with following:

conf.enable_bintest

C++ ABI

By default, mruby uses setjmp/longjmp to implement its exceptions. But it doesn't release C++ stack object correctly. To support mrbgems written in C++, mruby can be configured to use C++ exception.

There are two levels of C++ exception handling. The one is enable_cxx_exception that enables C++ exception, but uses C ABI. The other is enable_cxx_abi where all files are compiled by C++ compiler.

When you mix C++ code, C++ exception would be enabled automatically. If you need to enable C++ exception explicitly add the following:

conf.enable_cxx_exception

C++ exception disabling.

If your compiler does not support C++ and you want to ensure you don't use mrbgem written in C++, you can explicitly disable C++ exception, add following:

conf.disable_cxx_exception

and you will get an error when you try to use C++ gem. Note that it must be called before enable_cxx_exception or gem method.

Debugging mode

To enable debugging mode add the following:

conf.enable_debug

When debugging mode is enabled

Cross-Compilation

mruby can also be cross-compiled from one platform to another. To achieve this the build_config.rb needs to contain an instance of MRuby::CrossBuild. This instance defines the compilation tools and flags for the target platform. An example could look like this:

MRuby::CrossBuild.new('32bit') do |conf|
  toolchain :gcc

  conf.cc.flags << "-m32"
  conf.linker.flags << "-m32"
end

All configuration options of MRuby::Build can also be used in MRuby::CrossBuild.

Mrbtest in Cross-Compilation

In cross compilation, you can run mrbtest on emulator if you have it by changing configuration of test runner.

conf.test_runner do |t|
  t.command = ... # set emulator. this value must be non nil or false
  t.flags = ... # set flags of emulator

  def t.run(bin) # override `run` if you need to change the behavior of it
    ... # `bin` is the full path of mrbtest
  end
end

Build process

During the build process the directory build will be created in the root directory. The structure of this directory will look like this:

+- build
   |
   +-  host
       |
       +- bin          <- Binaries (mirb, mrbc and mruby)
       |
       +- lib          <- Libraries (libmruby.a and libmruby_core.a)
       |
       +- mrblib
       |
       +- src
       |
       +- test         <- mrbtest tool
       |
       +- tools
          |
          +- mirb
          |
          +- mrbc
          |
          +- mruby

The compilation workflow will look like this:

 _____    _____    ______    ____    ____    _____    _____    ____
| CC  |->|GEN  |->|AR    |->|CC  |->|CC  |->|AR   |->|CC   |->|CC  |
| *.c |  |y.tab|  |core.a|  |mrbc|  |*.rb|  |lib.a|  |mruby|  |mirb|
 -----    -----    ------    ----    ----    -----    -----    ----

Cross-Compilation

In case of a cross-compilation to i386 the build directory structure looks like this:

+- build
   |
   +-  host
   |   |
   |   +- bin           <- Native Binaries
   |   |
   |   +- lib           <- Native Libraries
   |   |
   |   +- mrblib
   |   |
   |   +- src
   |   |
   |   +- test          <- Native mrbtest tool
   |   |
   |   +- tools
   |      |
   |      +- mirb
   |      |
   |      +- mrbc
   |      |
   |      +- mruby
   +- i386
      |
      +- bin            <- Cross-compiled Binaries
      |
      +- lib            <- Cross-compiled Libraries
      |
      +- mrblib
      |
      +- src
      |
      +- test           <- Cross-compiled mrbtest tool
      |
      +- tools
         |
         +- mirb
         |
         +- mrbc
         |
         +- mruby

An extra directory is created for the target platform. In case you compile for i386 a directory called i386 is created under the build directory.

The cross compilation workflow starts in the same way as the normal compilation by compiling all native libraries and binaries. Afterwards the cross compilation process proceeds like this:

 _______________________________________________________________
|              Native Compilation for Host System               |
|  _____      ______      _____      ____      ____      _____  |
| | CC  | -> |AR    | -> |GEN  | -> |CC  | -> |CC  | -> |AR   | |
| | *.c |    |core.a|    |y.tab|    |mrbc|    |*.rb|    |lib.a| |
|  -----      ------      -----      ----      ----      -----  |
 ---------------------------------------------------------------
                                ||
                               \||/
                                \/
 ________________________________________________________________
|             Cross Compilation for Target System                |
|  _____      _____      _____      ____      ______      _____  |
| | CC  | -> |AR   | -> |CC   | -> |CC  | -> |AR    | -> |CC   | |
| | *.c |    |lib.a|    |mruby|    |mirb|    |core.a|    |mrbc | |
|  -----      -----      -----      ----      ------      -----  |
 ----------------------------------------------------------------

Build Configuration Examples

Minimal Library

To build a minimal mruby library you need to use the Cross Compiling feature due to the reason that there are functions (i.e. stdio) which can't be disabled for the main build.

MRuby::CrossBuild.new('Minimal') do |conf|
  toolchain :gcc

  conf.cc.defines = %w(MRB_DISABLE_STDIO)
  conf.bins = []
end

This configuration defines a cross compile build called 'Minimal' which is using the GCC and compiles for the host machine. It also disables all usages of stdio and doesn't compile any binaries (i.e. mrbc).

Test Environment

mruby's build process includes a test environment. In case you start the testing of mruby, a native binary called mrbtest will be generated and executed. This binary contains all test cases which are defined under test/t. In case of a cross-compilation an additional cross-compiled mrbtest binary is generated. You can copy this binary and run on your target system.