libcxx/utils/ci/build-picolibc.sh

   1 #!/usr/bin/env bash
   2 # ===----------------------------------------------------------------------===##
   3 #
   4 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 # See https://llvm.org/LICENSE.txt for license information.
   6 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 #
   8 # ===----------------------------------------------------------------------===##
   9
  10 #
  11 # This script builds picolibc (https://github.com/picolibc/picolibc) from
  12 # source to facilitate building libc++ against it.
  13 #
  14
  15 set -e
  16
  17 PROGNAME="$(basename "${0}")"
  18
  19 function error() { printf "error: %s\n" "$*" >&2; exit 1; }
  20
  21 function usage() {
  22 cat <<EOF
  23 Usage:
  24 ${PROGNAME} [options]
  25
  26 [-h|--help]                  Display this help and exit.
  27
  28 --build-dir <DIR>            Path to the directory to use for building.
  29
  30 --install-dir <DIR>          Path to the directory to install the library to.
  31 EOF
  32 }
  33
  34 while [[ $# -gt 0 ]]; do
  35     case ${1} in
  36         -h|--help)
  37             usage
  38             exit 0
  39             ;;
  40         --build-dir)
  41             build_dir="${2}"
  42             shift; shift
  43             ;;
  44         --install-dir)
  45             install_dir="${2}"
  46             shift; shift
  47             ;;
  48         --target)
  49             target="${2}"
  50             shift; shift
  51             ;;
  52         *)
  53             error "Unknown argument '${1}'"
  54             ;;
  55     esac
  56 done
  57
  58 for arg in build_dir install_dir target; do
  59     if [ -z ${!arg+x} ]; then
  60         error "Missing required argument '--${arg//_/-}'"
  61     elif [ "${!arg}" == "" ]; then
  62         error "Argument to --${arg//_/-} must not be empty"
  63     fi
  64 done
  65
  66
  67 echo "--- Downloading picolibc"
  68 picolibc_source_dir="${build_dir}/picolibc-source"
  69 picolibc_build_dir="${build_dir}/picolibc-build"
  70 mkdir -p "${picolibc_source_dir}"
  71 mkdir -p "${picolibc_build_dir}"
  72 # Download a known good version of picolibc.
  73 picolibc_commit="48fbc2009c6473293d03d5ec6f190565c6223a5c"
  74 curl -L "https://github.com/picolibc/picolibc/archive/${picolibc_commit}.zip" --output "${picolibc_source_dir}/picolibc.zip"
  75 unzip -q "${picolibc_source_dir}/picolibc.zip" -d "${picolibc_source_dir}"
  76 mv "${picolibc_source_dir}/picolibc-${picolibc_commit}"/* "${picolibc_source_dir}"
  77 rm -rf "${picolibc_source_dir}/picolibc-${picolibc_commit}"
  78
  79 cat <<EOF > "${picolibc_build_dir}/meson-cross-build.txt"
  80 [binaries]
  81 c = ['${CC:-cc}', '--target=${target}', '-mfloat-abi=soft', '-nostdlib']
  82 ar = 'llvm-ar'
  83 as = 'llvm-as'
  84 ld = 'lld'
  85 strip = 'llvm-strip'
  86 [host_machine]
  87 system = 'none'
  88 cpu_family = 'arm'
  89 cpu = 'arm'
  90 endian = 'little'
  91 [properties]
  92 skip_sanity_check = true
  93 EOF
  94
  95 venv_dir="${build_dir}/meson-venv"
  96 python3 -m venv "${venv_dir}"
  97 # Install the version of meson that was the latest at the time this script was written.
  98 "${venv_dir}/bin/pip" install "meson==1.1.1"
  99
 100 "${venv_dir}/bin/meson" setup \
 101   -Dincludedir=include -Dlibdir=lib -Dspecsdir=none -Dmultilib=false -Dpicoexit=false \
 102   --prefix "${install_dir}" \
 103   --cross-file "${picolibc_build_dir}/meson-cross-build.txt" \
 104   "${picolibc_build_dir}" \
 105   "${picolibc_source_dir}"
 106
 107 "${venv_dir}/bin/meson" install -C "${picolibc_build_dir}"