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# How to build Groonga with CMake

This document describes how to build Groonga from source with CMake.

To get more details about installing Groonga from the source with CMake on a specific environment, find the document for the specific environment from Install.

## Install depended software

Here is depended software for GNU/Linux, UNIX and Windows.

TODO

### GNU/Linux or UNIX

> - CMake

### Windows

> - Microsoft Visual Studio Community

> - CMake

## Download source

You can get the latest source from packages.groonga.org.

### GNU/Linux or UNIX

    $ wget https://packages.groonga.org/source/groonga/groonga-13.0.0.tar.gz
    $ tar xvzf groonga-13.0.0.tar.gz

### Windows

Download the latest zipped source from packages.groonga.org.

> - https://packages.groonga.org/source/groonga/groonga-13.0.0.zip

Then extract it.

## Run `cmake`

You need to generate build files such as `Makefile` for your environment.

You can custom your build configuration by passing options to `cmake`.

### CMake options

This section describes important options of CMake.

#### `-G GENERATOR`

Specify a generator.

The default is depending on the system.

You can check the default generator and available generators by `cmake --help`.

    $ cmake --help
    ...
    The following generators are available on this platform (* marks default):
      Green Hills MULTI            = Generates Green Hills MULTI files
                                    (experimental, work-in-progress).
    * Unix Makefiles               = Generates standard UNIX makefiles.
      Ninja                        = Generates build.ninja files.
      Ninja Multi-Config           = Generates build-<Config>.ninja files.
      Watcom WMake                 = Generates Watcom WMake makefiles.
      CodeBlocks - Ninja           = Generates CodeBlocks project files.
      CodeBlocks - Unix Makefiles  = Generates CodeBlocks project files.
      CodeLite - Ninja             = Generates CodeLite project files.
      CodeLite - Unix Makefiles    = Generates CodeLite project files.
      Eclipse CDT4 - Ninja         = Generates Eclipse CDT 4.0 project files.
      Eclipse CDT4 - Unix Makefiles= Generates Eclipse CDT 4.0 project files.
      Kate - Ninja                 = Generates Kate project files.
      Kate - Unix Makefiles        = Generates Kate project files.
      Sublime Text 2 - Ninja       = Generates Sublime Text 2 project files.
      Sublime Text 2 - Unix Makefiles

Here is an example how to specify `Unix Makefiles` on GNU/Linux or UNIX.

    $ cmake . -G "Unix Makefiles"

Here is an example how to specify `Visual Studio 17 2022 x64` as a generator on Windows. You can specify a target platform name (architecture) with the `-A` option.

    > cmake . -G "Visual Studio 17 2022" -A x64

#### `-DCMAKE_INSTALL_PREFIX`

Specify a directory to install Groonga.

The default is depending on the system, e.g. `/usr/local` or `C:/Program Files/groonga`.

Here is an example how to specify `/tmp/local/` as an install directory on GNU/Linux or UNIX.

    $ cmake . -DCMAKE_INSTALL_PREFIX="/tmp/local/"

Here is an example how to specify `C:\Groonga` as an install directory on Windows.

    > cmake . -DCMAKE_INSTALL_PREFIX="C:\Groonga"

#### `-DGRN_WITH_MRUBY`

Enables mruby support.

You can use the Sharding plugin and ruby_eval with the mruby support.

The default is `OFF`.

Groonga builds bundled mruby if the mruby support is enabled. In order to build mruby, you must install some requierd libraries. See the mruby compile guide for more details.

Here is an example how to enable the mruby support.

    $ cmake . -DGRN_WITH_MRUBY=ON

#### `-DGRN_WITH_DEBUG`

Enables debug options for C/C++ compiler. It’s useful for debugging on debugger such as GDB and LLDB.

The default is `OFF`.

Here is an example how to enable debug options.

    $ cmake . -DGRN_WITH_DEBUG=ON

#### `-DGRN_WITH_APACHE_ARROW`

Enables Apache Arrow support.

In addition to using Apache Arrow IPC streaming format output, you can also use multithreading processing that is used in n_workers and query_parallel_or with the Apache Arrow support.

The default is `OFF`.

You can install Apache Arrow following to the official installation procedure.

Here is an example how to enable the Apache Arrow support.

    $ cmake . -DGRN_WITH_APACHE_ARROW=ON

Note

If you install Apache Arrow manually, you need to use the -DCMAKE_PREFIX_PATH=PATHS option.

#### `-DCMAKE_PREFIX_PATH=PATHS`

Adds search paths for `.cmake` files.

You can specify multiple path separating them with `:` on GNU/Linux or UNIX, `;` on Windows.

In case of using libraries installed via a package manager, you do not need to specify this parameter. It is because `.cmake` files for those libraries are in the default search paths of CMake.

In case of using libraries installed in non-system directories such as `/usr`, you need to specify `.cmake` file paths of those libraries by this parameter.

Here is an example how to specify a `.cmake` file path for `/tmp/local/lib/cmake/Arrow/ArrowConfig.cmake` on GNU/Linux or UNIX.

    $ cmake . -DCMAKE_PREFIX_PATH="/tmp/local"

Here is an example how to specify a `.cmake` file path for `C:\arrow\lib\cmake\Arrow\ArrowConfig.cmake` on Windows.

    > cmake . -DCMAKE_PREFIX_PATH="C:\arrow"

## Build and install Groonga

Now, you can build Groonga.

### GNU/Linux or UNIX

You can use `make`.

Here is a command line to build and install Groonga by `make`.

    $ make -j$(nproc || PATH="/sbin:$PATH" sysctl -n hw.ncpu) > /dev/null
    $ sudo make install

We recommend to add `> /deb/null` to `make` in order to see only warning and error messages. Developers shouldn’t add new warnings and errors in new commit.

### Windows

You can use Visual Studio or `cmake --build`.

Here is a command line to build and install Groonga by `cmake --build`.

    > cmake --build . --config Release
    > cmake --build . --config Release --target Install

You should specify `--config Debug` instead of `--config Release` when debugging.