configure

#!/bin/bash
# Copyright (c) 2022 LG Electronics Inc.
# SPDX-License-Identifier: GPL-2.0

prefix=/usr/local

CC=${CC:-${CROSS_COMPILE}gcc}
CXX=${CXX:-${CROSS_COMPILE}g++}
LD=${LD:-${CROSS_COMPILE}ld}

srcdir=$(readlink -f $(dirname $0))
objdir=$(readlink -f ${objdir:-${PWD}})
output=${output:-${objdir}/.config}

usage() {
    echo "Usage: $0 [<options>]

  --help                print this message
  --prefix=<DIR>        set install root dir as <DIR>        (default: /usr/local)
  --bindir=<DIR>        set executable install dir as <DIR>  (default: \${prefix}/bin)
  --libdir=<DIR>        set library install dir as <DIR>     (default: \${prefix}/lib)
  --objdir=<DIR>        set build dir as <DIR>               (default: \${PWD})
"
    exit 1
}

while getopts ":ho:-:p" opt; do
    case "$opt" in
        -)
	    # process --long-options
	    case "$OPTARG" in
                help)            usage ;;
                *=*)             opt=${OPTARG%%=*}; val=${OPTARG#*=}
                                 eval "${opt/-/_}='$val'" ;;
                *)               ;;
            esac
	    ;;
        o)       output=$OPTARG ;;
        *)       usage ;;
    esac
done
shift $((OPTIND - 1))

bindir=${bindir:-${prefix}/bin}
libdir=${libdir:-${prefix}/lib}

# objdir can be changed, reset output
objdir=$(readlink -f ${objdir})
output=${output:-${objdir}/.config}

cat >$output <<EOF
# this file is generated automatically
override prefix := $prefix
override bindir := $bindir
override libdir := $libdir
EOF

cat >>$output <<EOF

override CC      := $CC
override CXX     := $CXX
override LD      := $LD
override CFLAGS   = $CFLAGS
override CXXFLAGS = $CXXFLAGS
override LDFLAGS  = $LDFLAGS

override srcdir  := $srcdir
override objdir  := $objdir
EOF

if [ "$srcdir" != "$objdir" ]; then
    cat > $objdir/Makefile <<EOF
srcdir := $srcdir
objdir := $objdir

export srcdir objdir

MAKEFLAGS = --no-print-directory

all:
	@\$(MAKE) -C \$(srcdir)

clean:
	@rm -f heaptrace libheaptrace.so *.o

install:
	@\$(MAKE) -C \$(srcdir) install

.PHONY: all clean install
EOF
    if [ $(id -u) -eq 0 ]; then
        chmod 666 $objdir/Makefile
    fi
fi