add arm64 support

Author: skarlsson

README.md

@@ -1,2 +1,38 @@
 # toolchains_gcc_packages
 Bazel toolchains for GNU GCC
+
+## Overview
+This repository builds GCC toolchains for use with Bazel build system using crosstool-ng.
+
+## Supported Architectures
+- x86_64 (AMD64)
+- aarch64 (ARM64)
+
+## Building
+
+### Using Docker (recommended)
+```bash
+# Build for x86_64 (default)
+./docker_build_and_run.sh
+
+# Build for ARM64
+./docker_build_and_run.sh arm64
+
+# Build for specific architecture and GCC version
+./docker_build_and_run.sh arm64 12
+```
+
+### Manual Build
+```bash
+# Set required environment variables
+export GCC=12  # GCC major version
+export ARCH=x86_64  # or arm64/aarch64
+
+# Run the build
+./build.sh
+```
+
+## Output
+The build will create a tarball in the `output/` directory:
+- For x86_64: `x86_64-unknown-linux-gnu_gcc12.tar.gz`
+- For ARM64: `aarch64-unknown-linux-gnu_gcc12.tar.gz`

build.sh

@@ -14,17 +14,33 @@
 # *******************************************************************************
 
 export GCC=${GCC:?Please set GCC variable to desired gcc major version}
+export ARCH=${ARCH:-x86_64}
+
+# Map architecture to target triplet
+case $ARCH in
+  x86_64)
+    TARGET_TRIPLET="x86_64-unknown-linux-gnu"
+    ;;
+  arm64|aarch64)
+    TARGET_TRIPLET="aarch64-unknown-linux-gnu"
+    ;;
+  *)
+    echo "Unsupported architecture: $ARCH"
+    echo "Supported architectures: x86_64, arm64/aarch64"
+    exit 1
+    ;;
+esac
 
 mkdir -p ${PWD}/output/downloads
-mkdir -p ${PWD}/output/gcc${GCC}
+mkdir -p ${PWD}/output/${TARGET_TRIPLET}_gcc${GCC}
 
 ###############################################################################
 #
 # Build
 #
 ###############################################################################
-export CT_PREFIX="${PWD}/output/gcc${GCC}"
-DEFCONFIG=configs/x86_64-unknown-linux-gnu_gcc${GCC} ct-ng defconfig
+export CT_PREFIX="${PWD}/output/${TARGET_TRIPLET}_gcc${GCC}"
+DEFCONFIG=configs/${TARGET_TRIPLET}_gcc${GCC} ct-ng defconfig
 ct-ng -j$(nproc) build
 
 ###############################################################################
@@ -46,5 +62,5 @@ tar -c \
     --owner=0 \
     --group=0 \
     --numeric-owner \
-    -C "output/gcc${GCC}" . \
-    | gzip -n > "output/x86_64-unknown-linux-gnu_gcc${GCC}.tar.gz"
+    -C "output/${TARGET_TRIPLET}_gcc${GCC}" . \
+    | gzip -n > "output/${TARGET_TRIPLET}_gcc${GCC}.tar.gz"

configs/aarch64-unknown-linux-gnu_gcc12

@@ -0,0 +1,16 @@
+CT_CONFIG_VERSION="4"
+CT_LOCAL_TARBALLS_DIR="${CT_PREFIX}/../downloads"
+CT_ARCH_ARM=y
+CT_ARCH_64=y
+CT_ARCH_ARM_MODE_ARM=y
+CT_ARCH_ARM_V8=y
+CT_STATIC_TOOLCHAIN=y
+CT_KERNEL_LINUX=y
+CT_LINUX_V_5_15=y
+CT_BINUTILS_V_2_34=y
+CT_GLIBC_V_2_31=y
+CT_GLIBC_KERNEL_VERSION_NONE=y
+CT_GCC_V_12=y
+CT_CC_GCC_LNK_HASH_STYLE_BOTH=y
+CT_CC_LANG_CXX=y
+CT_COMP_LIBS_EXPAT=y

docker_build_and_run.sh

@@ -33,5 +33,11 @@ else
     exit 1
 fi
 
+# Parse command line arguments
+ARCH=${1:-x86_64}
+GCC_VERSION=${2:-12}
+
+echo "Building toolchain for architecture: $ARCH with GCC version: $GCC_VERSION"
+
 # Execute the build of the selected toolchain
-docker run --rm -it --user "$(id -u):$(id -g)" -v ${PWD}:/workspace $FULL_IMAGE_NAME /bin/bash -c "cd /workspace && GCC=12 ./build.sh"
+docker run --rm -it --user "$(id -u):$(id -g)" -v ${PWD}:/workspace $FULL_IMAGE_NAME /bin/bash -c "cd /workspace && GCC=$GCC_VERSION ARCH=$ARCH ./build.sh"