musl-cross-make/scripts/macsimum

#!/bin/sh -e

#===============================================================
# Filename : macsimum
# Purpose  : Builds Mac-to-Linux cross-compiler toolchains.
# Authors  : Zach van Rijn <me@zv.io>
# License  : MIT
# Revision : 20200303
#===============================================================

#---------------------------------------------------------------
# README
#
# overview
# --------
#
# This script builds "musl-cross-make" cross-compiler toolchains
# that are hosted on macOS and target Linux. For example, your
# Macintosh machine can use up-to-date versions of GCC to build
# code (C, C++, Fortran) for your MIPS router. The libc used is
# called 'musl': https://www.musl-libc.org/faq.html
#
# Others have tried and failed to deliver what you're able to do
# with this tiny script.
#
# What does this look like? Modern GCC that does:
#
#   * macOS --> ARM, Motorola 68000, MIPS, OpenRISC, PowerPC,
#               RISC-V, S/390, SuperH, x86-based, more?
#
# The goal, of course, is to achieve parity with musl.cc's Linux
# offerings. A link to pre-built macOS binaries is now public,
# and this is the script to reproduce them. https://mac.musl.cc/
#
#
# requirements
# ------------
#
# Basically, you need XCode Command Line Tools. I don't know any
# specific version requirements, but if you encounter problems I
# would appreciate a heads up.
#
# This document may be useful: https://git.zv.io/snippets/34/raw
#
# You'll also need a working internet connection.
#
# A previous version of this script relied on Homebrew for some
# of the utilities that we're using. This, contrary to intent,
# created a Homebrew dependency. No longer! Build products are
# now fully portable (across compatible macOS / OS X versions).


#---------------------------------------------------------------
# Dependency versions (for bootstrap compiler and tooling)

V_SED=4.7   ;
V_PAT=2.7.6 ;
V_GMP=6.1.2 ;
V_MPF=4.0.2 ;
V_MPC=1.1.0 ;
V_ISL=0.21  ;
V_GCC=9.2.0 ;
V_BUT=2.34  ;

V_GM4=1.4.18;
V_BIS=3.4.2 ;
V_FLX=2.6.4 ;
V_CUT=8.31  ;


#---------------------------------------------------------------
# Production compiler configuration data (or use heredoc)

tool=musl-cross-make;           # musl-cross-make repository
conf=$(curl -s https://conf.musl.cc/mac_20200229_9-2-1.txt);


#---------------------------------------------------------------
# Dependency mirrors

M_GNU=https://ftp.gnu.org/gnu;
M_ISL=http://isl.gforge.inria.fr;

M_FLX=https://github.com/westes/flex/releases/download;


#---------------------------------------------------------------
# Build configuration

##
# It is possible to build all library and utility dependencies
# for the building of musl-cross-make production toolchains on a
# RAM disk. This may improve performance on systems with slow
# disks, and requires approximately 3GB of space. 4GB is safe:
#
#   $ diskutil erasevolume HFS+ "RAMDISK"                      \
#     `hdiutil attach -nomount ram://$((2048 * 1024 * 4))`
#
# The '4' in the above example represents gigabytes.

rdsk=/Volumes/RAMDISK;          # dependency build prefix

##
# When the production toolchains are built, a significant bit of
# disk space is required. Do not attempt to build them in RAM if
# you are not on a server server with several dozen gigabytes of
# RAM and the assurance that your system won't crash :)

bdsk=/tmp;                      # production build prefix

##
# This directory will contain dependency build trees. It can be
# deleted after the toolchains are built.

bdir=${rdsk}/tmp;               # scratch directory location

##
# Within each dependency build tree, we want to perform an out-
# of-tree build. This is the (arbitrary) name of that directory.

tdir=x;                         # out-of-tree directory name

##
# This directory will contain the dependency libraries and tools
# and can also be deleted after the toolchains are built, but it
# may be useful to maintain this directory for future builds.

sdir=${rdsk}/sys;               # system installation directory


#---------------------------------------------------------------
# Supporting routines

# prep <URL> <TARFLAG> <STRIP> [<CONFIG> ...]
prep ()
{
    _tar="${1}"; shift;
    _str="${1}"; shift;
    _url="${1}"; shift;
    _cnf="${@}";

    base=$(basename ${_url});   # name of file being downloaded
    name=${base%-*};            # name of project w/o version

    [ ! -f "${sdir}/._${base}" ] || return 0;

    rm -fr "${bdir}/${name}";
    mkdir -p "${bdir}/${name}/${tdir}";

    cd "${bdir}/${name}";
    curl -sL ${_url}                                           \
        | tar --strip-components=${_str} -x${_tar}f -;

    cd "${tdir}";

    (                           # subshell for isolation
        export PATH="${sdir}/bin:$PATH";

        export CPPFLAGS="-I${sdir}/include";
        export CFLAGS="";
        export CXXFLAGS="";
        export LDFLAGS="-L${sdir}/lib";

        ../configure --prefix="${sdir}" ${_cnf};
        make && make install;

        touch "${sdir}/._${base}";
    )
}

# (no args) Builds production toolchains for mac.musl.cc
musl ()
{
    cd "${bdsk}";

    if [ ! -d "${tool}" ]; then
        git clone https://git.zv.io/toolchains/${tool}.git;
    fi

    cd ${tool};

    printf > config.mak "%s\n" "${conf}";

    PATH="${sdir}/bin:$PATH" ./scripts/buildmac;
}


#---------------------------------------------------------------
# Stage 1: Bootstrap compiler

prep j 1 ${M_GNU}/sed/sed-${V_SED}.tar.xz                      \
    ;

prep j 1 ${M_GNU}/patch/patch-${V_PAT}.tar.xz                  \
    ;

prep j 1 ${M_GNU}/m4/m4-${V_GM4}.tar.xz                        \
    ;

prep j 1 ${M_GNU}/bison/bison-${V_BIS}.tar.xz                  \
    ;

prep z 1 ${M_FLX}/v${V_FLX}/flex-${V_FLX}.tar.gz               \
    --disable-shared                                           \
    --enable-static                                            \
    ;

prep j 1 ${M_GNU}/gmp/gmp-${V_GMP}.tar.xz                      \
    --disable-shared                                           \
    --enable-static                                            \
    --enable-cxx                                               \
    ;

prep j 1 ${M_GNU}/mpfr/mpfr-${V_MPF}.tar.xz                    \
    --disable-shared                                           \
    --enable-static                                            \
    --with-gmp="${sdir}"                                       \
    ;

prep z 1 ${M_GNU}/mpc/mpc-${V_MPC}.tar.gz                      \
    --disable-shared                                           \
    --enable-static                                            \
    --with-gmp="${sdir}"                                       \
    ;

prep j 1 ${M_ISL}/isl-${V_ISL}.tar.xz                          \
    --disable-shared                                           \
    --enable-static                                            \
    --with-gmp-prefix="${sdir}"                                \
    ;

prep j 1 ${M_GNU}/coreutils/coreutils-${V_CUT}.tar.xz          \
    --disable-shared                                           \
    --enable-static                                            \
    FORCE_UNSAFE_CONFIGURE=1                                   \
    ;

prep j 1 ${M_GNU}/gcc/gcc-${V_GCC}/gcc-${V_GCC}.tar.xz         \
    --enable-languages=c,c++                                   \
    --with-gmp="${sdir}"                                       \
    --with-mpfr="${sdir}"                                      \
    --with-mpc="${sdir}"                                       \
    --with-isl="${sdir}"                                       \
    --enable-multilib                                          \
    --disable-bootstrap                                        \
    ;

if false; then
prep j 1 ${M_GNU}/binutils/binutils-${V_BUT}.tar.xz            \
    --disable-shared                                           \
    --enable-static                                            \
    --disable-multilib                                         \
    ;
fi


#---------------------------------------------------------------
# Stage 2: Production toolchains

musl;