wut/README.md

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# wut
Let's try make a Wii U Toolchain / SDK for creating rpx/rpl.

Licensed under the terms of the GNU General Public License, version 2 or later (GPLv2+).

## Usage
See [samples](samples) for examples of how to use wut.

The [share/wut.cmake](share/wut.cmake) file provides several helpers for your build:
- `wut_create_rpx(target.rpx executable)` - Will create an .rpx file from your CMake target generated by `add_executable`
- `wut_enable_newlib(target)` - Links against the wut implementation of newlib, this is useful for using any function from the C standard library
- `wut_enable_stdcpp(target)` - Links against the wut implementation of stdcpp, this is useful for using any function from the C++ standard library. This will call wut_enable_newlib if you have not already done so.
- `wut_default_malloc(target)` - By default newlib will allocate 90% of the default heap for use with sbrk & malloc, if this is unacceptable to you then you should use this as it replaces the newlib malloc functions which ones which redirect to the CafeOS default heap functions such as MEMAllocFromDefaultHeap.
- `wut_enable_devoptab_sd(target)` - This links in wutdevoptab_sd which is useful for using the libc file functions with paths such as `fopen("sd:/file.txt", "r")` to read files from the sd card

A minimal CMakeLists.txt file for a C++ project might look like:
```
cmake_minimum_required(VERSION 3.2)
project(helloworld_cpp CXX)
include("${WUT_ROOT}/share/wut.cmake" REQUIRED)

add_executable(helloworld_cpp
   main.cpp)

wut_enable_stdcpp(helloworld_cpp)
wut_create_rpx(helloworld_cpp.rpx helloworld_cpp)
```

Which you would compile with
```
export DEVKITPPC=/opt/devkitpro/devkitPPC
export WUT_ROOT=<path/to/install>
mkdir build && cd build
cmake -DCMAKE_TOOLCHAIN_FILE=$WUT_ROOT/share/wut.toolchain.cmake ../
make
```

## Building
Requires:
- A modern compiler with C++14/17 support
- CMake
- zlib
- [devkitPPC r31+](https://devkitpro.org/wiki/Getting_Started)

### Building on Windows
Use [WSL](https://docs.microsoft.com/en-us/windows/wsl/install-win10) and then follow the Linux instructions.

For example, if you installed Ubuntu 18.04 then you might setup your environment like:

```
sudo apt install cmake zlib1g-dev gcc-7 g++-7 build-essentials
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 50
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 5
wget https://github.com/devkitPro/pacman/releases/download/devkitpro-pacman-1.0.1/devkitpro-pacman.deb
sudo dpkg -i devkitpro-pacman.deb
sudo ln -s /proc/mounts /etc/mtab
sudo dkp-pacman -S devkitPPC wiiload
```

### Building on Linux / MacOS
```
export DEVKITPPC=/opt/devkitpro/devkitPPC
git clone --recursive https://github.com/decaf-emu/wut.git
cd wut
mkdir build && cd build
cmake -DCMAKE_INSTALL_PREFIX=<path/to/install> ../
make install
export WUT_ROOT=<path/to/install>
```

Then for any wut project you want to build you must use the wut.toolchain.cmake script:

```
cd ../samples/helloworld
mkdir build && cd build
cmake -DCMAKE_TOOLCHAIN_FILE=$WUT_ROOT/share/wut.toolchain.cmake ../
make
```