/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

namespace Magnum {
/** @page custom-buildsystems Using Magnum with custom buildsystems
@brief Guide and troubleshooting when you don't want to use CMake.

@m_keyword{Using custom buildsystems,,}
@m_keyword{Custom buildsystems,,}
@m_footernavigation

While Magnum uses CMake as its primary buildsystem, it's possible to use Magnum
with a custom buildsystem as well. The following guide will highlight the most
important concepts for both using and building Magnum.

@attention Please note that custom buildsystems are not officially supported,
    though their use is *not discouraged*. This guide aims to cover the most
    important aspects, but the topic is so broad that it's not feasible to
    cover all platform differences and quirks --- that's why we let CMake do it
    for us :) You are on your own here. Good luck.

@section custom-buildsystems-usage Using already built Magnum with a custom buildsystem

The easier situation is building Magnum itself with CMake, as explained in
@ref building, and then integrating the installed libraries and headers into
your buildsystem. For Magnum built this way, every library has a name
corresponding to the namespace name and the headers are also in a directory
with the same name.

@subsection custom-buildsystems-usage-dependency-order Library dependency order

Preserving library linking order is important to avoid linker errors. For
Corrade and libraries in the main Magnum repository the order is the following.
The @m_span{m-text m-primary} light blue @m_endspan libraries are the *core*,
which you need to link every time, the @m_span{m-text m-info} dark blue @m_endspan
libraries are extra functionality. Some libraries have cyclic dependencies, in
which case they are both compiled into a single library, the other part of the
cyclic dependency marked with a dotted rectangle. Deprecated libraries that are
scheduled for removal are marked with a @m_span{m-text m-dim} dim @m_endspan
color. In some cases a dependency is optional (marked with a dotted line) and
you can remove the dependency by disabling parts or configuration options that
require given dependency. See documentation of each library for more
information.

@todo make this diagram clickable once [the dumpster fire](https://github.com/mosra/m.css/pull/69) is fixed

@m_div{m-container-inflate} @m_div{m-row} @m_div{m-col-m-12 m-nopadt}
@dotfile custom-buildsystems-order.dot
@m_enddiv @m_enddiv @m_enddiv

So, for example, in order to use the @ref Primitives library, you need to link
the libraries in this order, the leaf libraries first and the root dependencies
last:

    MagnumPrimitives MagnumTrade Magnum CorradePluginManager CorradeUtility

Note that some libraries have dependencies outside of Magnum and the above
diagram doesn't include them --- again, see documentation of each library for
more information.

@subsection custom-buildsystems-usage-static-plugins Static plugins

While dynamic plugins work without buildsystem integration, static plugins are
handled automagically with CMake and you need to replicate the magic manually
when using a custom buildsystem. This is just about compiling an additonal
`*.cpp` file together with your final app, see @ref plugins-static for more
information.

For linking static plugins, there's the following dependency order. Most
plugins have just a single dependency on its interface lib, however there are
some exceptions:

@m_div{m-container-inflate} @m_div{m-row} @m_div{m-col-m-12 m-nopady}
@dotfile custom-buildsystems-order-plugins.dot
@m_enddiv @m_enddiv @m_enddiv

@subsection custom-buildsystems-usage-resource-compilation Resource compilation

The CMake macro @cmake corrade_add_resource() @ce provides a convenience
wrapper macro around the @ref corrade-rc executable. For the following CMake
code:

@code{.cmake}
corrade_add_resource(MyApp_RESOURCES resources.conf)

add_executable(MyApp main.cpp ${MyApp_RESOURCES})
@endcode

The following is an equivalent shell invocation:

@code{.sh}
corrade-rc MyApp_RESOURCES resources.conf resources.cpp

# Now compile resources.cpp into your app
@endcode

In both cases, `MyApp_RESOURCES` can be used for importing the resources at
runtime with @ref CORRADE_RESOURCE_INITIALIZE(), if needed. Also note that the
@cmake corrade_add_resource() @ce is doing dependency tracking by introspecting
the `resources.conf` file. For a custom buildsystem you have to implement that
by parsing the file yourself.

@subsection custom-buildsystems-usage-toolchains Cross-compilation

Magnum maintains a set of CMake toolchains for cross-compiling. Each toolchain
typically sets custom linker and compiler flags and you may want to replicate
the behavior 1:1 to avoid issues. The toolchain files are available at
https://github.com/mosra/toolchains.

@section custom-buildsystems-building Building Magnum with a custom buildsystem

@todoc mention configure.h generation from .cmake templates
@todoc mention resources for shaders etc.
@todoc mention various platform-specific
@todoc mention dependency on GL, AL; `dl` for GLFW and SDL apps on Linux (and various frameworks on mac+iOS)

*/

}