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RISC-V GNU Compiler Toolchain
=============================
This is the RISC-V C and C++ cross-compiler. It supports two build modes:
a generic ELF/Newlib toolchain and a more sophisticated Linux-ELF/glibc
toolchain.
Author
------
Andrew Waterman
Contributors
------------
- Yunsup Lee
- Quan Nguyen
- Albert Ou
- Darius Rad
- Matt Thomas
- ultraembedded (github id)
### Prerequisites
Several standard packages are needed to build the toolchain. On Ubuntu,
executing the following command should suffice:
$ sudo apt-get install autoconf automake autotools-dev libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo patchutils
On Mac OS, the source and build directories must live in a case-sensitive file
system. The simplest approach is to create and mount a new disk image with
that property. Make sure that the mount point does not contain spaces.
### Installation (Newlib)
To build the Newlib cross-compiler, pick an install path. If you choose,
say, `/opt/riscv`, then add `/opt/riscv/bin` to your `PATH` now. Then, simply
run the following command:
./configure --prefix=/opt/riscv
make
You should now be able to use riscv-gcc and its cousins.
### Installation (Linux)
To build the Linux cross-compiler, pick an install path. If you choose,
say, `/opt/riscv`, then add `/opt/riscv/bin` to your `PATH` now. Then, simply
run the following command:
./configure --prefix=/opt/riscv
make linux
### Installation (Linux multilib)
To build the Linux cross-compiler with support for both 32-bit and
64-bit, run the following commands:
./configure --prefix=/opt/riscv --enable-multilib
make linux
The multilib compiler will have the prefix riscv-unknown-linux-gnu-,
rather than the usual prefix (riscv32-... or riscv64-...).
### Advanced Options
There are a number of additional options that may be passed to
configure. See './configure --help' for more details.
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