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#!/bin/sh
set -e
CONFIGDIR="$(dirname $0)/mk"
show_help() {
cat <<-EOF
usage: ./configure [options...]
Options:
-d Enable debugging symbols and asserts
-I dir Set the directory to use for #include files
-a arch Choose the underlying architecture to build for:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/architecture.conf)
-c version Conform to:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/c.conf)
-p version Conform to:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/posix.conf)
-w wordsize Choose a word size for the architecuture:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/wordsize.conf)
-x version Conform to:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/xopen.conf)
-X number Enable C Extension:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/cext.conf)
EOF
}
validate_option() {
option="${CONFIGDIR}/$1.conf"
for opt in $(awk '/^[0-9]/ { print $1 }' "${option}"); do
if [ "$2" = "${opt}" ]; then
echo "$2"
return 0
fi
done
printf 'Invalid option '%s'. Valid options are:\n' "$2" >&2
cat "${option}" >&2
exit 1
}
option=
architecture=x86
wordsize=64
debug=0
include=
standard_c=
posix=
xopen=
cext=
while getopts dhc:p:x:I:X: option; do
case ${option} in
a) architecture=$(validate_option architecture ${OPTARG}) ;;
c) standard_c=$(validate_option c ${OPTARG}) ;;
p) posix=$(validate_option posix ${OPTARG}) ;;
w) wordsize=$(validate_option wordsize ${OPTARG}) ;;
x) xopen=$(validate_option xopen ${OPTARG}) ;;
X) cext=$(validate_option cext ${OPTARG}) ;;
I) include=${OPTARG} ;;
d) debug=1 ;;
h) show_help
exit 0
;;
?) printf 'Unknown option "%c". Try "-h" for help.\n' $option
exit 1
;;
esac
done
if [ -z "${standard_c}" ] && [ -z "${posix}" ] && [ -z "${xopen}" ]; then
xopen=700
fi
if [ -n "${posix}" ] && [ -n "${xopen}" ]; then
printf 'Specify only one of "-x" or "-p".\n'
exit 1
fi
if [ -n "${xopen}" ]; then
if [ $xopen -eq 700 ]; then
posix=200809
elif [ $xopen -eq 600 ]; then
posix=200112
elif [ $xopen -eq 500 ]; then
posix=199506
else
posix=2
fi
fi
if [ -z "${standard_c}" ] && [ -n "${posix}" ]; then
if [ $posix -ge 200112 ]; then
standard_c=199901
else
standard_c=1
fi
fi
if [ ${posix:-0} -ge 200112 ] && [ $standard_c -lt 199901 ]; then
printf 'POSIX.1-2001 and newer require C99 or newer.\n'
exit 1
fi
if [ -n "${cext}" ] && [ ${standard_c:-1} -lt 201112 ]; then
printf 'C Extension 1 requires at least C11.\n'
exit 1
fi
printf 'Building C library for %d-bit %s conforming to:\n' "${wordsize}" "${architecture}"
printf 'ISO C: %d' ${standard_c}
test -n "${cext}" && printf ' (Extensions: %s)' ${cext}
printf '\n'
test -n "${posix}" && printf 'POSIX: %d\n' ${posix}
test -n "${xopen}" && printf 'X/OPEN: %d\n' ${xopen}
cat <<-EOF > .config.mk
.POSIX:
ARCHITECTURE=${architecture}
WORDSIZE=${wordsize}
TOPDIR=$(dirname $0)
SRCDIR=\$(TOPDIR)/src
INCDIR=${include}
OBJDIR=./obj
EOF
if [ ${standard_c:-1} -lt 199901 ]; then
printf 'CC=c89\n' >> .config.mk
else
printf 'CC=c%02d\n' $(( (standard_c / 100) % 100 )) >> .config.mk
fi
CFLAGS="${CFLAGS}"
if [ $debug -eq 1 ]; then
CFLAGS="${CFLAGS} -g"
else
CFLAGS="${CFLAGS} -DNDEBUG"
fi
if [ -n "${xopen}" ]; then
if [ $xopen -eq 400 ]; then
CFLAGS="${CFLAGS} -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED=1"
else
CFLAGS="${CFLAGS} -D_XOPEN_SOURCE=${xopen}"
fi
elif [ -n "${posix}" ]; then
CFLAGS="${CFLAGS} -D_POSIX_C_SOURCE=${posix}"
fi
printf 'CFLAGS=$(BASE_CFLAGS) %s\n\n' "${CFLAGS}" >> .config.mk
#
# TODO: C extentsion
#
for lib in $(cat $(dirname $0)/mk/*.d | grep 'lib.*_[CPX]\.' | cut -d: -f1 | sort -u); do
ver=$(echo $lib | cut -d. -f2)
if (echo $lib | grep -q _C) && [ "$ver" -le ${standard_c:-1} ]; then
printf 'all: %s\n' $lib >> .config.mk
elif (echo $lib | grep -q _P) && [ "$ver" -le ${posix:-0} ]; then
printf 'all: %s\n' $lib >> .config.mk
elif (echo $lib | grep -q _X) && [ "$ver" -le ${xopen:-0} ]; then
printf 'all: %s\n' $lib >> .config.mk
fi
done
### generate main Makefile
if ! [ -f Makefile ]; then
cp "$(dirname $0)/Makefile" .
fi
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