feat: port gcc to MontaukOS
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#!/usr/bin/env bash
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#
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# build-native-sdk.sh — Build the Montauk SDK: binutils + GCC compiled
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# to run *on* MontaukOS (--host=x86_64-montauk), staged for the OS image.
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#
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# Usage: ./toolchain/build-native-sdk.sh (or: make sdk)
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#
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# Produces:
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# toolchain/native/sdk/ — native as/ld/ar/nm/... (stripped)
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# toolchain/native-gcc/sdk/ — native gcc/g++ driver + cc1/cc1plus/collect2
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#
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# The `devkit` target in programs/GNUmakefile ships these into the OS
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# image at 0:/sdk. Without them the ISO builds WITHOUT the SDK.
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#
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# Requires the x86_64-montauk cross toolchain (build-montauk-toolchain.sh
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# is invoked automatically; it also downloads/patches the shared sources
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# and refreshes toolchain/sysroot from the current libc).
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#
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# This script is idempotent — each stage is skipped once its output
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# exists. To force a rebuild (e.g. after libc changes, so the native
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# tools relink against the fixed libc):
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# rm -rf toolchain/native toolchain/native-gcc \
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# toolchain/build/binutils-native toolchain/build/gcc-native
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set -euo pipefail
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BINUTILS_VERSION="2.43.1"
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GCC_VERSION="14.2.0"
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HOST="x86_64-montauk"
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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PREFIX="${SCRIPT_DIR}/local"
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SRC_DIR="${SCRIPT_DIR}/src"
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BUILD_DIR="${SCRIPT_DIR}/build"
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SYSROOT="${SCRIPT_DIR}/sysroot"
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NATIVE_BINUTILS="${SCRIPT_DIR}/native"
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NATIVE_GCC="${SCRIPT_DIR}/native-gcc"
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JOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)"
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bold() { printf '\033[1m%s\033[0m\n' "$*"; }
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green() { printf '\033[1;32m%s\033[0m\n' "$*"; }
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bold "=== Building the Montauk SDK (native ${HOST} binutils + GCC) ==="
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# ── Cross toolchain + sources + sysroot ──────────────────────────────────────
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# build-montauk-toolchain.sh is idempotent: it downloads and patches the
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# shared binutils/GCC sources, always refreshes the sysroot from the
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# current libc, and skips compiler builds once installed.
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"${SCRIPT_DIR}/build-montauk-toolchain.sh"
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export PATH="${PREFIX}/bin:${PATH}"
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# ── Host-build fix-ups in the GCC source tree ────────────────────────────────
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# The bundled gmp/mpfr/mpc/isl/gettext carry their own config.sub copies
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# that predate the montauk target; overwrite each with the patched
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# top-level one so they configure for --host=x86_64-montauk.
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GCC_SRC="${SRC_DIR}/gcc-${GCC_VERSION}"
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for sub in gmp mpfr mpc isl gettext; do
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for cs in "${GCC_SRC}/${sub}/config.sub" "${GCC_SRC}/${sub}/build-aux/config.sub"; do
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if [[ -f "${cs}" ]] && ! grep -q montauk "${cs}"; then
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bold "Patching config.sub: ${cs#"${SRC_DIR}/"}"
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cp "${GCC_SRC}/config.sub" "${cs}"
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fi
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done
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done
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# --disable-nls does not skip the bundled gettext, and its gnulib needs
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# more locale surface than the Montauk libc has. Drop the symlink so the
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# toplevel treats it as absent.
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if [[ -L "${GCC_SRC}/gettext" ]]; then
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bold "Removing gettext symlink (not buildable against the Montauk libc)"
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rm "${GCC_SRC}/gettext"
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fi
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# The gcc subdir resolves --with-native-system-header-dir=/sdk/include
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# inside the build sysroot at build time; give the sysroot an sdk -> usr
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# alias so that path exists.
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if [[ ! -e "${SYSROOT}/sdk" ]]; then
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ln -s usr "${SYSROOT}/sdk"
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fi
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# ── Native binutils ──────────────────────────────────────────────────────────
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if [[ -x "${NATIVE_BINUTILS}/sdk/bin/ld" ]]; then
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bold "Native binutils already staged — skipping."
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else
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bold "Building native binutils ${BINUTILS_VERSION} (host ${HOST})..."
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rm -rf "${BUILD_DIR}/binutils-native"
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mkdir -p "${BUILD_DIR}/binutils-native"
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(
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cd "${BUILD_DIR}/binutils-native"
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"${SRC_DIR}/binutils-${BINUTILS_VERSION}/configure" \
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--build=x86_64-pc-linux-gnu \
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--host="${HOST}" \
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--target="${HOST}" \
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--prefix=/sdk \
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--disable-nls \
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--disable-werror \
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--disable-gprofng \
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--disable-gold \
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--disable-plugins \
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--disable-shared \
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--enable-static
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# Only gas/ld/binutils: gprof needs fscanf %[] scansets the
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# Montauk libc lacks; gold and gprofng are disabled outright.
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make -j"${JOBS}" all-gas all-ld all-binutils
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make install-strip-gas install-strip-ld install-strip-binutils \
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DESTDIR="${NATIVE_BINUTILS}"
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)
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green "Native binutils staged into toolchain/native/sdk."
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fi
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# ── Native GCC ───────────────────────────────────────────────────────────────
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if [[ -x "${NATIVE_GCC}/sdk/bin/gcc" ]]; then
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bold "Native GCC already staged — skipping."
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else
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bold "Building native GCC ${GCC_VERSION} (host ${HOST})..."
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rm -rf "${BUILD_DIR}/gcc-native"
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mkdir -p "${BUILD_DIR}/gcc-native"
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(
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cd "${BUILD_DIR}/gcc-native"
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"${SRC_DIR}/gcc-${GCC_VERSION}/configure" \
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--build=x86_64-pc-linux-gnu \
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--host="${HOST}" \
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--target="${HOST}" \
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--prefix=/sdk \
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--with-native-system-header-dir=/sdk/include \
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--with-build-sysroot="${SYSROOT}" \
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--enable-languages=c,c++ \
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--disable-nls \
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--disable-shared \
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--disable-multilib \
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--disable-gcov \
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--disable-lto \
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--disable-plugin \
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--disable-bootstrap \
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--disable-fixincludes \
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--with-newlib \
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--enable-initfini-array \
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--disable-wchar_t \
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--disable-libstdcxx-pch \
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--with-gnu-as \
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--with-gnu-ld
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# The gcc subdir configure cannot run host (montauk) binaries to
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# probe endianness; preset it.
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ac_cv_c_bigendian=no make -j"${JOBS}" all-gcc
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make install-gcc DESTDIR="${NATIVE_GCC}"
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)
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# install-gcc does not strip, and cc1/cc1plus carry ~700 MB of debug
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# info between them (the ISO balloons to 1.7 GB if this is skipped).
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bold "Stripping native GCC binaries..."
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GCC_LIBEXEC="${NATIVE_GCC}/sdk/libexec/gcc/${HOST}/${GCC_VERSION}"
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for b in "${GCC_LIBEXEC}/cc1" "${GCC_LIBEXEC}/cc1plus" "${GCC_LIBEXEC}/collect2" \
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"${NATIVE_GCC}/sdk/bin/gcc" "${NATIVE_GCC}/sdk/bin/g++" \
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"${NATIVE_GCC}/sdk/bin/cpp"; do
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if [[ -f "${b}" ]]; then
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"${PREFIX}/bin/${HOST}-strip" "${b}"
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fi
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done
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green "Native GCC staged into toolchain/native-gcc/sdk."
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fi
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# ── Done ─────────────────────────────────────────────────────────────────────
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echo
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green "=== Montauk SDK ready ==="
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bold "Staged trees:"
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bold " ${NATIVE_BINUTILS}/sdk (as, ld, ar, nm, objdump, ...)"
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bold " ${NATIVE_GCC}/sdk (gcc, g++, cpp, cc1, cc1plus, collect2)"
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bold "The next 'make' ships them into the OS image at 0:/sdk (devkit target)."
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