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#!/bin/sh
set -e
CONFIGDIR="$(dirname $0)/config"
show_help() {
cat <<-EOF
usage: ./configure [options...]
Options:
-a arch Choose the underlying architecture to build for:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/architecture)
-c version Conform to:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/versions.c)
-p version Conform to:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/versions.posix)
-w wordsize Choose a word size for the architecuture:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/wordsize)
-x version Conform to:
$(awk '{ printf("\t%s\n", $0); }' ${CONFIGDIR}/versions.xopen)
EOF
}
validate_option() {
option="${CONFIGDIR}/$1"
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
standard_c=
posix=
xopen=
while getopts hc:p: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}) ;;
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 ] && [ $standard_c -lt 199901 ]; then
printf 'POSIX.1-2001 and newer require C99 or newer.\n'
exit 1
fi
printf 'Building C library for %d-bit %s conforming to:\n' "${wordsize}" "${architecture}"
printf 'ISO C: %d\n' ${standard_c}
test -n "${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=\$(TOPDIR)/include
OBJDIR=./obj
EOF
if [ ${standard_c:-1} -lt 199901 ]; then
printf 'CC=c89\n' >> .config.mk
else
printf 'CC=c%02d\n' $(( (standard_c / 100) % 100 )) >> .config.mk
fi
if [ -n "${xopen}" ]; then
if [ $xopen -eq 400 ]; then
printf 'CFLAGS=-D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED=1\n' >> .config.mk
else
printf 'CFLAGS=-D_XOPEN_SOURCE=%d\n' "${xopen}" >> .config.mk
fi
elif [ -n "${posix}" ]; then
printf 'CFLAGS=-D_POSIX_C_SOURCE=%d\n' "${posix}" >> .config.mk
fi
### generate .build.mk
cat <<EOF > .build.mk
.POSIX:
# work-around GNU ar's default "deterministic" mode
ARFLAGS=rvU
default: all
include .config.mk
include \$(TOPDIR)/.deps.mk
EOF
rm -f .build.all.mk
for lib in $(ls $(dirname $0)/.deps/lib* | sed -e 's#^.*/\(lib.*\)\..*$#\1#g' | grep -v '\.h$' | sort -u); do
printf '%s.a:' "${lib}"
for cver in $(ls $(dirname $0)/.deps/${lib}.C_* 2>/dev/null | sed -e 's#^.*\.C_##g'); do
if [ $cver -le ${standard_c:-1} ]; then
printf ' $(%s_C_%d_OBJS)' "${lib}" "${cver}"
printf '%s\n' "${lib}" >> .build.all.mk
fi
done
for pver in $(ls $(dirname $0)/.deps/${lib}.POSIX_* 2>/dev/null | sed -e 's#^.*\.POSIX_##g'); do
if [ $pver -le ${posix:-0} ]; then
printf ' $(%s_POSIX_%d_OBJS)' "${lib}" "${pver}"
printf '%s\n' "${lib}" >> .build.all.mk
fi
done
for xver in $(ls $(dirname $0)/.deps/${lib}.XOPEN_* 2>/dev/null | sed -e 's#^.*\.XOPEN_##g'); do
if [ $xver -le ${xopen:-0} ]; then
printf ' $(%s_XOPEN_%d_OBJS)' "${lib}" "${xver}"
printf '%s\n' "${lib}" >> .build.all.mk
fi
done
printf '\n\t$(AR) $(ARFLAGS) $@ $^\n\n'
done >> .build.mk
printf 'all:' >> .build.mk
sort -u .build.all.mk | awk '{printf(" %s.a", $0);}' >> .build.mk
printf '\n' >> .build.mk
rm -f .build.all.mk
for i in $libs; do
echo $i
done >> .build.mk
### generate main Makefile
### FIXME: this can probably be kept as a fixed file
cat <<EOF > Makefile
.POSIX:
.DEFAULT:;\$(MAKE) all
include .config.mk
all: \$(TOPDIR)/.deps.mk \$(INCDIR)
@mkdir -p \$(OBJDIR)
\$(MAKE) -f .build.mk
deps: \$(TOPDIR)/.headers.mk \$(TOPDIR)/.deps.mk
\$(TOPDIR)/.deps.mk: \$(TOPDIR)/mk.sh
sh -c '. \$(TOPDIR)/mk.sh; cd \$(TOPDIR); make_deps_mk'
\$(TOPDIR)/.headers.mk: \$(TOPDIR)/mk.sh
sh -c '. \$(TOPDIR)/mk.sh; cd \$(TOPDIR); make_headers_mk'
headers \$(INCDIR): \$(TOPDIR)/.headers.mk \$(TOPDIR)/mkh.sh
\$(MAKE) -f \$(TOPDIR)/.headers.mk headers
ctags:
ctags \$\$(find src -name \*.c)
clean:
rm -rf \$(OBJDIR) *.a
extra-clean: clean
rm -rf .deps .deps.mk .headers.mk \$(INCDIR)
EOF
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