113 lines
3.3 KiB
Bash
113 lines
3.3 KiB
Bash
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#!/usr/bin/env bash
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#===----------------------------------------------------------------------===##
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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#===----------------------------------------------------------------------===##
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#
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# This script builds picolibc (https://github.com/picolibc/picolibc) from
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# source to facilitate building libc++ against it.
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#
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set -e
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PROGNAME="$(basename "${0}")"
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function error() { printf "error: %s\n" "$*" >&2; exit 1; }
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function usage() {
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cat <<EOF
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Usage:
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${PROGNAME} [options]
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[-h|--help] Display this help and exit.
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--build-dir <DIR> Path to the directory to use for building.
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--install-dir <DIR> Path to the directory to install the library to.
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EOF
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}
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while [[ $# -gt 0 ]]; do
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case ${1} in
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-h|--help)
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usage
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exit 0
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;;
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--build-dir)
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build_dir="${2}"
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shift; shift
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;;
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--install-dir)
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install_dir="${2}"
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shift; shift
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;;
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--target)
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target="${2}"
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shift; shift
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;;
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*)
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error "Unknown argument '${1}'"
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;;
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esac
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done
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for arg in build_dir install_dir target; do
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if [ -z ${!arg+x} ]; then
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error "Missing required argument '--${arg//_/-}'"
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elif [ "${!arg}" == "" ]; then
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error "Argument to --${arg//_/-} must not be empty"
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fi
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done
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echo "--- Downloading picolibc"
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picolibc_source_dir="${build_dir}/picolibc-source"
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picolibc_build_dir="${build_dir}/picolibc-build"
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mkdir -p "${picolibc_source_dir}"
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mkdir -p "${picolibc_build_dir}"
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# Download the version of picolibc that was the latest at the time this script was written.
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# Following changes are required and were introduced after version 1.8.5:
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# - updated semihost arguments handling,
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# - added missing macros in stdio.h
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# - external linkage for isblank
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# Version following 1.8.5, was not released by the time of writing.
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picolibc_commit="04a90c56d7aac61880f205ec29b3dce6a9de0342"
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curl -L "https://github.com/picolibc/picolibc/archive/${picolibc_commit}.zip" --output "${picolibc_source_dir}/picolibc.zip"
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unzip -q "${picolibc_source_dir}/picolibc.zip" -d "${picolibc_source_dir}"
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mv "${picolibc_source_dir}/picolibc-${picolibc_commit}"/* "${picolibc_source_dir}"
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rm -rf "${picolibc_source_dir}/picolibc-${picolibc_commit}"
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cat <<EOF > "${picolibc_build_dir}/meson-cross-build.txt"
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[binaries]
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c = ['${CC:-cc}', '--target=${target}', '-mfloat-abi=soft', '-nostdlib']
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ar = 'llvm-ar'
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as = 'llvm-as'
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ld = 'lld'
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strip = 'llvm-strip'
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[host_machine]
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system = 'none'
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cpu_family = 'arm'
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cpu = 'arm'
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endian = 'little'
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[properties]
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skip_sanity_check = true
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EOF
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venv_dir="${build_dir}/meson-venv"
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python3 -m venv "${venv_dir}"
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# Install the version of meson that was the latest at the time this script was written.
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"${venv_dir}/bin/pip" install "meson==1.1.1"
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"${venv_dir}/bin/meson" setup \
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-Dincludedir=include -Dlibdir=lib -Dspecsdir=none -Dmultilib=false -Dpicoexit=false \
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--prefix "${install_dir}" \
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--cross-file "${picolibc_build_dir}/meson-cross-build.txt" \
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"${picolibc_build_dir}" \
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"${picolibc_source_dir}"
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"${venv_dir}/bin/meson" install -C "${picolibc_build_dir}"
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