build.sh

#!/bin/bash

osname=`uname -s`
osarch=`uname -m` 

## it is too tedious to maintain two paths, so Perl generator is now
## default (since it's required for bootstrap anyway) and R is deprecated
: ${PERL=$(command -v perl)}

args=($@)
for ((i=1;i<=$#;i++)); do
    case "x${!i}" in
	x--) unset args[$i-1]; break;;
	x-f) FORCE=1; unset args[$i-1];;
	x-b) BINARY=1; unset args[$i-1];; ## defunct
	x-x) USEX11=1; unset args[$i-1];; ## not documented, macOS only
	x-p) PERL=$(command -v perl); unset args[$i-1]; if [ -z "$PERL" ]; then PERL=perl; fi;;
	x-h)
	    echo ''
	    echo " Usage: $0 [-f] [-h] [[--] ...]"
	    echo ''
	    echo ' -f  - create builds/Makefile even if it exists'
	    echo ' --  - any further arguments are passed ann not interpreted'
	    echo ' -h  - this help page'
	    echo ' ... additional arguments passed to make'
	    echo ''
	    echo 'The builds are performed in the "builds" subdirectory'
	    echo ''
	    exit 0;;
    esac
done

if [ -n "$BINARY" ]; then
    echo 'ERROR: Binary installs are no longer supported by this script.'
    echo '       Please use https://mac.R-project.org/bin/install.R'
    exit 1
fi

## auto-detect PREFIX if not specified
if [ -z "$PREFIX" -a x$OSARCH = xarm64 -a x$osname = xDarwin ]; then
  PREFIX=opt/R/arm64
fi
if [ -z "$PREFIX" ]; then
    if [ -e "/opt/R/$osarch" ]; then
	PREFIX="opt/R/$osarch"
    else
	if [ x$osname = xDarwin ]; then
	    echo ''
	    echo "*** WARNING: you are using /usr/local as prefix, this is strongly discuraged"
	    echo "             as it tends to conflict with other package managers on macOS."
	    echo "             Consider creating /opt/R/$osarch instead:"
	    echo ''
	    echo "               sudo mkdir -p /opt/R/$osarch"
	    echo "               sudo chown \$USER /opt/R/$osarch"
	    echo ''
	fi
	PREFIX=usr/local
    fi
fi

## fall back to CMake.app if necessary
if [ -e /Applications/CMake.app/Contents/bin/cmake ]; then
    PATH=$PATH:/Applications/CMake.app/Contents/bin
fi

## make sure prefix is first on the PATH
export PATH=/$PREFIX/bin:/$PREFIX/sbin:$PATH

## make sure there are no leading slashes
PREFIX=`echo $PREFIX | sed 's:^/*::'`

## $PREFIX paths have to be in the flags except for /usr and /usr/local
if [ /"$PREFIX" != /usr/local -a "/$PREFIX" != /usr ]; then
  if [ -z "$CPPFLAGS" ]; then
    export CPPFLAGS="-I/$PREFIX/include"
  fi
  if [ -z "$LDFLAGS" ]; then
    export LDFLAGS="-L/$PREFIX/lib"
  fi
fi

echo "Building for $osname ($osarch):"
echo "install prefix: /$PREFIX"

export PREFIX

if [ ! -e "/$PREFIX/bin" ]; then
    mkdir -p "/$PREFIX/bin" 2> /dev/null ## ok to fail, we deal with sudo later
fi

if touch /$PREFIX/bin/.1; then
  echo "sudo not required"
  export NOSUDO=1
  rm /$PREFIX/bin/.1
else
  if [ -n "$NOSUDO" ]; then
    echo "ERROR: NOSUDO is set, but /$PREFIX is not writable!" >&2
    exit 1
  fi
  echo "sudo required for installation"
fi

## if -f is used we re-build the Makefile regardless
if [ -n "$FORCE" ]; then
  rm -f build/Makefile
fi

## need to create Makefile?
if [ ! -e build/Makefile ]; then
    if [ -n "$PERL" ]; then
	RUN="$PERL scripts/mkmk.pl"
	echo "Using Perl generator ($PERL)"
    else
	echo "ERROR: Perl not found. Set PERL if in a non-standard location."
	exit 1
    fi

    if $RUN; then
	echo 'build/Makefile created.'
	echo ''
    else
	echo "ERROR: Makefile generation failed" >&2
	exit 1
    fi
fi

if [ x"$osname" = xDarwin ]; then
    PWD=`pwd`
    ## we are now providing stubs as a recipe so this should no longer be needed
    export PKG_CONFIG_PATH=/$PREFIX/lib/pkgconfig:/$PREFIX/share/pkgconfig:$PWD/stubs/pkgconfig-darwin:/usr/lib/pkgconfig
    if [ -n "$USEX11" -a -e /usr/X11/lib/pkgconfig ]; then
	export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:/usr/X11/lib/pkgconfig:/usr/X11/share/pkgconfig"
    fi
fi

set -e
make -C build "${args[@]}"