init

Author: prepkg

.gitignore

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+/.idea
+/build

README.md

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+# GCC Toolchain
+
+GCC toolchain targeting **older glibc versions**, designed for building Linux binaries that run across a wide range of
+distributions. This toolchain is intended for use inside a Docker container running **Ubuntu 24.04 or later**.
+
+## Why?
+
+The usual method for producing portable Linux binaries is to compile them on an outdated distribution (e.g., CentOS 7).
+
+This repository provides a **modern alternative**: a GCC toolchain configured to target an older glibc, ensuring
+compatibility and preventing errors like:
+
+```text
+/lib64/libc.so.6: version `GLIBC_2.XX' not found
+```
+
+## Supported Toolchains
+
+* x86_64-linux-gnu:
+
+| Component  | Version  |
+|:-----------|:---------|
+| GCC        | 15.2.0   |
+| glibc      | 2.17     |
+| Binutils   | 2.45     |
+| GDB        | 16.3     |
+
+* aarch64-linux-gnu:
+
+| Component  | Version  |
+|:-----------|:---------|
+| GCC        | 15.2.0   |
+| glibc      | 2.17     |
+| Binutils   | 2.29.1   |
+| GDB        | 16.3     |
+
+## Compilation
+
+* Clone the repository:
+
+```shell
+git clone https://github.com/prepkg/gcc-toolchain.git && cd gcc-toolchain
+```
+
+* Build the Docker image:
+
+```shell
+./setup.sh build-image
+```
+
+* Build the GCC toolchain:
+
+```shell
+./setup.sh build-toolchain
+```
+
+* (Optional) Check the toolchain component versions:
+
+```shell
+./setup.sh version
+```
+
+After compilation, the toolchains for each architecture will be available in the `build` directory.

config/aarch64-linux-gnu.config

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+CT_CONFIG_VERSION="4"
+CT_OBSOLETE=y
+CT_EXPERIMENTAL=y
+CT_ALLOW_BUILD_AS_ROOT=y
+CT_ALLOW_BUILD_AS_ROOT_SURE=y
+CT_ARCH_ARM=y
+CT_OMIT_TARGET_VENDOR=y
+CT_ARCH_64=y
+CT_KERNEL_LINUX=y
+CT_LINUX_V_3_10=y
+CT_BINUTILS_V_2_29=y
+CT_GLIBC_V_2_17=y
+CT_GCC_V_15=y
+CT_CC_GCC_LIBSANITIZER=y
+CT_CC_LANG_CXX=y
+CT_DEBUG_GDB=y
+CT_GLIBC_EXTRA_CFLAGS="-Wno-missing-attributes -Wno-array-bounds -Wno-array-parameter -Wno-stringop-overflow -Wno-maybe-uninitialized -Wno-implicit-int -gdwarf-4"

config/x86_64-linux-gnu.config

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+CT_CONFIG_VERSION="4"
+CT_OBSOLETE=y
+CT_EXPERIMENTAL=y
+CT_ALLOW_BUILD_AS_ROOT=y
+CT_ALLOW_BUILD_AS_ROOT_SURE=y
+CT_ARCH_X86=y
+CT_OMIT_TARGET_VENDOR=y
+CT_ARCH_64=y
+CT_KERNEL_LINUX=y
+CT_LINUX_V_3_10=y
+CT_BINUTILS_V_2_45=y
+CT_GLIBC_V_2_17=y
+CT_GCC_V_15=y
+CT_CC_GCC_LIBSANITIZER=y
+CT_CC_LANG_CXX=y
+CT_DEBUG_GDB=y

scripts/Dockerfile

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+FROM ubuntu:24.04
+
+WORKDIR /app
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y \
+        wget ca-certificates git gcc g++ make automake libtool-bin flex bison texinfo bzip2 xz-utils unzip help2man \
+        file patch gawk libncurses-dev python3-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+ENTRYPOINT ["/bin/bash"]

scripts/compile.sh

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+#!/bin/bash
+
+cd /tmp
+git clone https://github.com/crosstool-ng/crosstool-ng
+cd crosstool-ng
+git checkout 7f9d704
+
+./bootstrap
+./configure --enable-local
+make -j$(nproc)
+
+mkdir -p /app/build
+
+TOOLCHAINS=(
+  'x86_64-linux-gnu'
+  'aarch64-linux-gnu'
+)
+
+for toolchain in "${TOOLCHAINS[@]}"; do
+  cd /tmp/crosstool-ng
+  mkdir samples/$toolchain
+  cp /app/config/$toolchain.config samples/$toolchain/crosstool.config
+  ./ct-ng $toolchain
+
+  CT_PREFIX=/opt ./ct-ng build.$(nproc)
+  cd /opt && tar czf /app/build/gcc-$toolchain.tar.gz $toolchain
+done

scripts/version.sh

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+#!/bin/bash
+
+cd build
+
+TOOLCHAINS=(
+  'x86_64-linux-gnu'
+  'aarch64-linux-gnu'
+)
+
+for toolchain in "${TOOLCHAINS[@]}"; do
+  tar xf gcc-$toolchain.tar.gz
+
+  GCC_VERSION=$($toolchain/bin/$toolchain-gcc -dumpversion)
+  GLIBC_VERSION=$(strings $toolchain/$toolchain/sysroot/lib/libc.so.6 | grep GLIBC | sed 's/.*GLIBC_\([.0-9]*\).*/\1/g' | sort -Vu | tail -n1)
+  BINUTILS_VERSION=$($toolchain/bin/$toolchain-ld --version | head -n1 | grep -Po '[0-9.]+$')
+  GDB_VERSION=$($toolchain/bin/$toolchain-gdb --version | head -n1 | grep -Po '[0-9.]+$')
+
+  printf '* %s:\n\n' $toolchain
+  printf '| %-10s | %-8s |\n' 'Component' 'Version'
+  printf '|:-----------|:---------|\n'
+  printf '| %-10s | %-8s |\n' 'GCC' $GCC_VERSION
+  printf '| %-10s | %-8s |\n' 'glibc' $GLIBC_VERSION
+  printf '| %-10s | %-8s |\n' 'Binutils' $BINUTILS_VERSION
+  printf '| %-10s | %-8s |\n\n' 'GDB' $GDB_VERSION
+
+  rm -rf $toolchain
+done

setup.sh

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+#!/bin/bash
+
+if [[ ! $1 =~ ^(build-image|build-toolchain|version)$ ]]; then
+  echo 'Available arguments: build-image, build-toolchain, version'
+  exit 1
+fi
+
+if [[ $1 == build-image ]]; then
+  docker build -t gcc-toolchain scripts
+
+  exit 0
+fi
+
+if [[ $1 == build-toolchain ]]; then
+  docker run -it --rm -v ./:/app gcc-toolchain scripts/compile.sh
+  sudo chown -R $USER:$USER build
+
+  exit 0
+fi
+
+if [[ $1 == version ]]; then
+  docker run -it --rm -v ./:/app gcc-toolchain scripts/version.sh
+
+  exit 0
+fi