This is a little riscv 32bit platform C compiler, it takes preprocessing C files as input, and output riscv assembly files. It inherits from ucc. The author of ucc is Wenjun Wang.

Preparation

1. build riscv 32bit tool-chain

//donwload riscv-gnu-toolchain at https://github.com/riscv/riscv-gnu-toolchain, then start building#donwload riscv-gnu-toolchain at https://github.com/riscv/riscv-gnu-toolchain, then start building

$./configure --prefix=riscv32 --with-arch=rv32g --with-abi=ilp32

//build and install tool-chain

$sudo make linux

2.build qemu emulator in user mode

//download qmeu at https://www.qemu.org/, then start building

$./configure --prefix=/opt/qemu_user32 --target-list=riscv32-linux-user --enable-debug

//build and install qemu

$make

$sudo make install

3. add riscv-gnu-toolchain and qemu to your PATH

$ vim ~/.bashrc //add the following lines at the bottom, then save and quit

export PATH=$PATH:/opt/qemu_user32/bin:/opt/riscv32/bin

$ source ~/.bashrc

Build riscv_cc

//goto riscv_cc folder and start building

$cd riscv_cc

$make

Testing

1.compile a c file using riscv_cc

$cd riscv_cc/demo

$touch hello.c

$vim hello.c

//add the following lines to it, then save and quit

include <stdio.h>

void main()

{

int a = 3, b = 3;

a = a + b;

printf("%d\r\n", a);

}

2. Build hello.c using riscv_cc

//preprocessing C file using gcc

$riscv32-unknown-linux-gnu-gcc -U__GNUC__ -D_UCC -I../ucl/linux/include -std=c89 -E hello.c -o hello.i

//compile it to assembly file using riscv_cc(ucl)

$../ucl/ucl -o hello.s hello.i

//compile assembly file to executable

$riscv32-unknown-linux-gnu-gcc -o hello hello.s

//run the executable using qemu emulator

$qemu-riscv32 -L /opt/riscv32/sysroot/ ./hello