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README.md: Update ARC-V samples for arc-2025.09 #666

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README.md: Update ARC-V samples for arc-2025.09
kolerov Oct 9, 2025
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README.md: Add a note for proper environment configuration
kolerov Oct 23, 2025
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README.md: Add requirements for a host machine
kolerov Oct 23, 2025
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10 changes: 9 additions & 1 deletion README.md
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Expand Up @@ -56,6 +56,9 @@ As of today, the oldest supported distributions are:
* Ubuntu 22.04 LTS
* RHEL/AlmaLinux 8

A host machine must have at least 8GB of RAM and 200GB of disk space
to successfully build any of the toolchains listed below.

## Prerequisites

GNU toolchain for ARC has the same standard prerequisites as an upstream GNU
Expand Down Expand Up @@ -153,6 +156,9 @@ make

## Building the Toolchain

> :warning: Note, that `PATH` should not contain toolchains for the same target
> to prevent builds issue. `LD_LIBRARY_PATH` should be unset as well.

Once Crosstool-NG is built and ready for use it's very easy to get a toolchain
of choice to be built. One just needs to decide on configuration options
to be used for toolchain building or use one of the existing pre-defined
Expand Down Expand Up @@ -182,7 +188,9 @@ The following pre-defined configurations (they are called "samples" on Crosstool
1. `snps-arc64-snps-native-gnu` - Linux glibc "native" toolchain from ARC HS6x processors
1. `snps-arc64-unknown-elf` - Bare-metal cross-toolchain for ARC HS6x processors for 64-bit Linux hosts
1. `snps-riscv64-unknown-elf` - Bare-metal cross-toolchain for ARC-V processors with Newlib standard library for 64-bit Linux hosts
1. `snps-riscv64-win-elf` - Bare-metal cross-toolchain for ARC-V processors for 64-bit Windows hosts
1. `snps-riscv64-elf-win` - Bare-metal cross-toolchain for ARC-V processors with Newlib standard library for 64-bit Windows hosts
1. `snps-riscv64-snps-elf-picolibc` - Bare-metal cross-toolchain for ARC-V processors with Picolibc standard library for 64-bit Linux hosts
1. `snps-riscv64-elf-win-picolibc` - Bare-metal cross-toolchain for ARC-V processors with Picolibc standard library for 64-bit Windows hosts

And to get Crosstool-NG configured with either of those samples just say: `./ct-ng sample_name`. For example, to get bare-metal toolchain for ARCompact/ARCv2 processors say: `./ct-ng snps-arc-multilib-elf32`.

Expand Down