Ticket #47776: ld-hybrid

#!/bin/bash -e

# Configuration
# TODO: configure absolute paths at install
LD='/opt/local/bin/ld-latest'
LD_97='/opt/local/bin/ld-97'
LD_127='/opt/local/bin/ld-127'
PPC_ARCHS='ppc ppc64 ppc750 ppc7400 ppc7450 ppc970'

# Check for -v, -arch, and -macosx_version_min options
for optarg in "$@"; do
        case "$option" in
        -arch)
                arch="$optarg"
                ;;
        -macosx_version_min)
                minor_version="${optarg#10.}"
                minor_version="${minor_version%%.*}"
                ;;
        esac
        option="$optarg"
        case "$option" in
        -v)
                verbose=1
                ;;
        esac
done

# Switch to older ld version for ppc
if [ "$arch" = 'ppc' ]; then
        if [ "$minor_version" -le 4 ] 2>/dev/null; then
                if [ -x "$LD_97" ]; then
                        LD="$LD_97"
                else
                        printf >&2 'requires ld-97\n'
                        exit 1
                fi
        else
                if [ -x "$LD_127" ]; then
                        LD="$LD_127"
                elif [ -x "$LD_97" ]; then
                        LD="$LD_97"
                else
                        printf >&2 'requires ld-127 or ld-97\n'
                        exit 1
                fi
        fi
fi

# Filter stderr in verbose mode to add ppc to list of supported archs
if [ $verbose ]; then
        # note: process substitution is not specified by POSIX
        exec 2> >(sed "s/^configured to support archs: /&$PPC_ARCHS /" >&2)
fi

exec "$LD" "$@"