GNU MCU Eclipse RISC-V Embedded GCC

This is the GNU MCU Eclipse (formerly GNU ARM Eclipse) version of the RISC-V Embedded GCC toolchain.

Compliance

Starting with 8.2.0-2, the GNU MCU Eclipse RISC-V GCC follows the official SiFive releases, with as little differences as possible. Previously it followed the generic RISC-V releases.

This release is based on the v2019.02.0 release, and includes the SiFive extensions (like CLIC interrupts).

The following commits were used:

the sifive/riscv-gcc project, branch sifive-gcc-8.2.0, commit 242abcaff6 from from 5 April 2019
the sifive/riscv-binutils-gdb project, branch sifive-binutils-2.32, commit 164267155c from 28 February 2019
the sifive/riscv-newlib project, commit 42c2e3fb9f from 17 November 2018

GDB was upstreamed and does not require SiFive specific patches, so the current build uses git://sourceware.org/git/binutils-gdb.git, the c8aa0bb commit from 28 Feb 2019.

Changes

Compared to the original RISC-V version, the same architecture and API options are supported, and there are minimal functional changes

newlib-nano is supported
march=rv32imaf/mabi=ilp32f was added to the list of multilibs

newlib-nano

Support for newlib-nano is available using the --specs=nano.specs option. For better results, this option must be added to both compile and link time.

If no syscalls are needed, --specs=nosys.specs can be used at link time to provide empty implementations for the POSIX system calls.

The libraries are compiled with -O2 -mcmodel=medany.

Warning: It is mandatory for the applications to be compiled with -mcmodel=medany, otherwise the link will fail.

Documentation

Another addition compared to the SiFive distribution is the presence of the documentation, including the PDF manuals for all tools.

Support

For issues related to the procedure used to build the GNU MCU Eclipse RISC-V Embedded GCC binaries, please report them via gnu-mcu-eclipse/riscv-none-gcc-build GitHub Issues.

For issues related to the xPack used to install the binaries, please report them via gnu-mcu-eclipse/riscv-none-gcc-xpack GitHub issues.

For issues related to the toolchain functionality (compiler, newlib gdb, etc) please report them via their original RISC-V projects: