riscv64-unknown-elf-gcc
TLDR
Compile for RISC-V
$ riscv64-unknown-elf-gcc -o [output] [source.c]
Compile with specific architecture$ riscv64-unknown-elf-gcc -march=rv64imac -o [output] [source.c]
Compile for bare metal$ riscv64-unknown-elf-gcc -nostdlib -o [output] [source.c]
Produce assembly$ riscv64-unknown-elf-gcc -S [source.c]
SYNOPSIS
riscv64-unknown-elf-gcc [options] files...
DESCRIPTION
riscv64-unknown-elf-gcc is the GCC cross-compiler for RISC-V 64-bit bare-metal targets. It compiles C/C++ code for RISC-V processors without an operating system.
PARAMETERS
-march=arch
Target architecture (rv64imac, rv64gc).-mabi=abi
ABI (lp64, lp64d).-nostdlib
No standard library.-T script
Linker script.-mcmodel=model
Code model.-Olevel
Optimization level.
EXAMPLES
$ # Basic compilation
riscv64-unknown-elf-gcc -o hello hello.c
# With specific ISA extensions
riscv64-unknown-elf-gcc -march=rv64gc -mabi=lp64d -o prog prog.c
# Bare metal with linker script
riscv64-unknown-elf-gcc -nostdlib -T link.ld -o firmware firmware.c
# Generate object file
riscv64-unknown-elf-gcc -c -o main.o main.c
# With newlib
riscv64-unknown-elf-gcc --specs=nano.specs -o app app.c
riscv64-unknown-elf-gcc -o hello hello.c
# With specific ISA extensions
riscv64-unknown-elf-gcc -march=rv64gc -mabi=lp64d -o prog prog.c
# Bare metal with linker script
riscv64-unknown-elf-gcc -nostdlib -T link.ld -o firmware firmware.c
# Generate object file
riscv64-unknown-elf-gcc -c -o main.o main.c
# With newlib
riscv64-unknown-elf-gcc --specs=nano.specs -o app app.c
ARCHITECTURES
$ rv64imac - Integer, Multiply, Atomic, Compressed
rv64gc - General purpose (IMAFD + C)
rv32imac - 32-bit version
rv64gc - General purpose (IMAFD + C)
rv32imac - 32-bit version
CAVEATS
Cross-compiler for embedded. Requires RISC-V toolchain installation. Different from riscv64-linux-gnu-gcc.
HISTORY
RISC-V GCC toolchain was developed as part of the RISC-V open ISA project from UC Berkeley.
SEE ALSO
gcc(1), riscv64-unknown-elf-objdump(1), qemu-system-riscv64(1)
