Cross-compile RISC-V toolchain on Ubuntu with MinGW

instructions.md

1. Install MinGW packages on Ubuntu

sudo apt install mingw-w64

2. Download, build and install GMP for MinGW

   1. Download the src package from https://sourceforge.net/projects/mingw/files/MinGW/Base/gmp/gmp-6.1.2/
   2. Extract somewhere on your Ubuntu machine and enter the directory.
   3. Run ./configure --prefix=/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32
   4. make
   5. sudo make install

3. Download, build and install mpfr for MinGW

   1. Download the src package from https://sourceforge.net/projects/mingw/files/MinGW/Base/mpfr/mpfr-3.1.5/
   2. Extract somewhere on your Ubuntu machine and enter the directory.
   3. Run ./configure --prefix=/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
   4. make
   5. sudo make install

4. Download, build and install mpc for MinGW

   1. Download the src package from https://sourceforge.net/projects/mingw/files/MinGW/Base/mpc/mpc-1.0.1/
   2. Extract somewhere on your Ubuntu machine and enter the directory
   3. Run ./configure --prefix=/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
   4. make
   5. sudo make install

5. Build riscv-gnu-toolchain

   1. Clone the repository from https://github.com/riscv/riscv-gnu-toolchain
   2. Enter the directory and configure the build with ./configure --prefix=<absolute path of toolchain install dir> --with-arch=<you arch of choice> --with-abi=<your ABI of choice> --with-host=x86_64-w64-mingw32 --without-system-zlib
   3. make
   4. Wait and hope everything builds fine... :)