configure.sh - platform/external/bc - Gitiles

 #! /bin/sh
 #
 # Copyright 2018 Gavin D. Howard
 #
 # Permission to use, copy, modify, and/or distribute this software for any
 # purpose with or without fee is hereby granted.
 #
 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 # REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 # AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 # INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 # LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 # OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 #

 usage() {

 	if [ $# -gt 0 ]; then

 		val=1

 		printf "%s\n\n" "$1"

 	else
 		val=0
 	fi

 	printf 'usage: %s [-bD|-dB|-c] [-EgGhHMRS] [-O OPT_LEVEL] [-k KARATSUBA_LEN]\n' "$0"
 	printf '\n'
 	printf '    -b\n'
 	printf '        Build bc only. It is an error if "-d" or "-B" are specified too.\n'
 	printf '    -B\n'
 	printf '        Disable bc. It is an error if "-b" or "-D" are specified too.\n'
 	printf '    -c\n'
 	printf '        Generate test coverage code. Requires gcov and regcovr.\n'
 	printf '        It is an error if either "-b" ("-D") or "-d" ("-B") is specified.\n'
 	printf '        Requires a compiler that use gcc-compatible coverage options\n'
 	printf '    -d\n'
 	printf '        Build dc only. It is an error if "-b" is specified too.\n'
 	printf '    -D\n'
 	printf '        Disable dc. It is an error if "-d" or "-B" are specified too.\n'
 	printf '    -E\n'
 	printf '        Disable extra math. This includes: "$" operator (truncate to integer),\n'
 	printf '        "@" operator (set number of decimal places), and r(x, p) (rounding\n'
 	printf '        function). Additionally, this option disables the extra printing\n'
 	printf '        functions in the math library.\n'
 	printf '    -g\n'
 	printf '        Build in debug mode. Adds the "-g" flag, and if there are no\n'
 	printf '        other CFLAGS, and "-O" was not given, this also adds the "-O0"\n'
 	printf '        flag. If this flag is *not* given, "-DNDEBUG" is added to CPPFLAGS\n'
 	printf '        and a strip flag is added to the link stage.\n'
 	printf '    -G\n'
 	printf '        Disable generating tests. This is for platforms that do not have a\n'
 	printf '        GNU bc-compatible bc to generate tests.\n'
 	printf '    -h\n'
 	printf '        Print this help message and exit.\n'
 	printf '    -H\n'
 	printf '        Disable history.\n'
 	printf '    -k KARATSUBA_LEN\n'
 	printf '        Set the karatsuba length to KARATSUBA_LEN (default is 32).\n'
 	printf '        It is an error if KARATSUBA_LEN is not a number or is less than 2.\n'
 	printf '        It is an error if "-m" is specified too.\n'
 	printf '    -M\n'
 	printf '        Disable installing manpages.\n'
 	printf '    -O OPT_LEVEL\n'
 	printf '        Set the optimization level. This can also be included in the CFLAGS,\n'
 	printf '        but it is provided, so maintainers can build optimized debug builds.\n'
 	printf '        This is passed through to the compiler, so it must be supported.\n'
 	printf '    -R\n'
 	printf '        Disable the array references extension. This feature is an\n'
 	printf '        undocumented feature of the GNU bc, but this bc supports it.\n'
 	printf '        Additionally, since this feature is only available to bc,\n'
 	printf '        specifying "-d" ("-B") implies this option.\n'
 	printf '    -S\n'
 	printf '        Disable signal handling. On by default.\n'
 	printf '\n'
 	printf 'In addition, the following environment variables are used:\n'
 	printf '\n'
 	printf '    CC           C compiler. Must be compatible with POSIX c99.\n'
 	printf '                 Default is "c99".\n'
 	printf '    HOSTCC       Host C compiler. Must be compatible with POSIX c99.\n'
 	printf '                 Default is "$CC".\n'
 	printf '    HOST_CC      Same as HOSTCC. If HOSTCC also exists, it is used.\n'
 	printf '    CFLAGS       C compiler flags.\n'
 	printf '    HOSTCFLAGS   CFLAGS for HOSTCC. Default is "$CFLAGS".\n'
 	printf '    HOST_CFLAGS  Same as HOST_CFLAGS. If HOST_CFLAGS also exists, it is used.\n'
 	printf '    CPPFLAGS     C preprocessor flags. Default is "".\n'
 	printf '    LDFLAGS      Linker flags. Default is "".\n'
 	printf '    PREFIX       The prefix to install to. Default is "/usr/local".\n'
 	printf '                 If PREFIX is "/usr", install path will be "/usr/bin".\n'
 	printf '    BINDIR       The directory to install binaries. Default is "$PREFIX/bin".\n'
 	printf '    DATAROOTDIR  The root location for data files. Default is "$PREFIX/share".\n'
 	printf '    DATADIR      The location for data files. Default is "$DATAROOTDIR".\n'
 	printf '    MANDIR       The location to install manpages to. Default is "$DATADIR/man".\n'
 	printf '    MAN1DIR      The location to install Section 1 manpages to. Default is\n'
 	printf '                 "$MANDIR/man1".\n'
 	printf '    EXECSUFFIX   The suffix to append to the executable names, used to not\n'
 	printf '                 interfere with other installed bc executables. This can only\n'
 	printf '                 be a suffix because bc uses the first letter of the executable\n'
 	printf '                 name to switch between bc and dc. Default is "".\n'
 	printf '    DESTDIR      For package creation. Default is "".\n'
 	printf '    GEN_EMU      Emulator to run string generator code under\n'
 	printf '                 (leave empty if not necessary). Default is "".\n'

 	exit "$val"
 }

 err_exit() {

 	if [ "$#" -ne 1 ]; then
 		printf 'Invalid number of args to err_exit\n'
 		exit 1
 	fi

 	printf '%s\n' "$1"
 	exit 1
 }

 replace_ext() {

 	if [ "$#" -ne 3 ]; then
 		err_exit "Invalid number of args to $0"
 	fi

 	file="$1"
 	ext1="$2"
 	ext2="$3"

 	result=$(printf "$file" | sed -e "s@\.$ext1@\.$ext2@")

 	printf '%s\n' "$result"
 }

 replace_exts() {

 	if [ "$#" -ne 3 ]; then
 		err_exit "Invalid number of args to $0"
 	fi

 	files="$1"
 	ext1="$2"
 	ext2="$3"

 	for file in $files; do
 		new_name=$(replace_ext "$file" "$ext1" "$ext2")
 		result="$result $new_name"
 	done

 	printf '%s\n' "$result"
 }

 replace() {

 	if [ "$#" -ne 3 ]; then
 		err_exit "Invalid number of args to $0"
 	fi

 	str="$1"
 	needle="$2"
 	replacement="$3"

 	result=$(printf '%s' "$str" | sed -e "s!%%$needle%%!$replacement!g")

 	printf '%s\n' "$result"
 }

 gen_file_lists() {

 	if [ "$#" -lt 3 ]; then
 		err_exit "Invalid number of args to $0"
 	fi

 	contents="$1"
 	shift

 	filedir="$1"
 	shift

 	typ="$1"
 	shift

 	# If there is an extra argument, and it
 	# is zero, we keep the file lists empty.
 	if [ "$#" -gt 0 ]; then
 		use="$1"
 	else
 		use="1"
 	fi

 	needle_src="${typ}SRC"
 	needle_obj="${typ}OBJ"
 	needle_gcda="${typ}GCDA"
 	needle_gcno="${typ}GCNO"

 	if [ "$use" -ne 0 ]; then

 		replacement=$(ls $filedir/*.c | tr '\n' ' ')
 		contents=$(replace "$contents" "$needle_src" "$replacement")

 		replacement=$(replace_exts "$replacement" "c" "o")
 		contents=$(replace "$contents" "$needle_obj" "$replacement")

 		replacement=$(replace_exts "$replacement" "o" "gcda")
 		contents=$(replace "$contents" "$needle_gcda" "$replacement")

 		replacement=$(replace_exts "$replacement" "gcda" "gcno")
 		contents=$(replace "$contents" "$needle_gcno" "$replacement")

 	else
 		contents=$(replace "$contents" "$needle_src" "")
 		contents=$(replace "$contents" "$needle_obj" "")
 		contents=$(replace "$contents" "$needle_gcda" "")
 		contents=$(replace "$contents" "$needle_gcno" "")
 	fi

 	printf '%s\n' "$contents"
 }

 bc_only=0
 dc_only=0
 coverage=0
 karatsuba_len=32
 debug=0
 signals=1
 hist=1
 refs=1
 extra_math=1
 optimization=""
 generate_tests=1
 install_manpages=1

 while getopts "bBcdDEgGhHk:MO:RS" opt; do

 	case "$opt" in
 		b) bc_only=1 ;;
 		B) dc_only=1 ;;
 		c) coverage=1 ;;
 		d) dc_only=1 ;;
 		D) bc_only=1 ;;
 		E) extra_math=0 ;;
 		g) debug=1 ;;
 		G) generate_tests=0 ;;
 		h) usage ;;
 		H) hist=0 ;;
 		k) karatsuba_len="$OPTARG" ;;
 		M) install_manpages=0 ;;
 		O) optimization="$OPTARG" ;;
 		R) refs=0 ;;
 		S) signals=0 ;;
 		?) usage "Invalid option" ;;
 	esac

 done

 if [ "$bc_only" -eq 1 -a "$dc_only" -eq 1 ]; then
 	usage "Can only specify one of -b(-D) or -d(-B)"
 fi

 case $karatsuba_len in
 	(*[!0-9]*|'') usage "KARATSUBA_LEN is not a number" ;;
 	(*) ;;
 esac

 if [ "$karatsuba_len" -lt 2 ]; then
 	usage "KARATSUBA_LEN is less than 2"
 fi

 set -e

 script="$0"

 scriptdir=$(dirname "$script")

 link="@printf 'No link necessary\\\\n'"
 main_exec="BC_EXEC"

 bc_test="@tests/all.sh bc $extra_math $refs $generate_tests"
 dc_test="@tests/all.sh dc $extra_math $refs $generate_tests"

 timeconst="@tests/bc/timeconst.sh"

 # In order to have cleanup at exit, we need to be in
 # debug mode, so don't run valgrind without that.
 if [ "$debug" -ne 0 ]; then
 	vg_bc_test="@tests/all.sh bc $extra_math $refs $generate_tests valgrind \$(VALGRIND_ARGS) \$(BC_EXEC)"
 	vg_dc_test="@tests/all.sh dc $extra_math $refs $generate_tests valgrind \$(VALGRIND_ARGS) \$(DC_EXEC)"
 else
 	vg_bc_test="@printf 'Cannot run valgrind without debug flags\\\\n'"
 	vg_dc_test="@printf 'Cannot run valgrind without debug flags\\\\n'"
 fi

 karatsuba="@printf 'karatsuba cannot be run because one of bc or dc is not built\\\\n'"
 karatsuba_test="@printf 'karatsuba cannot be run because one of bc or dc is not built\\\\n'"

 bc_lib="\$(GEN_DIR)/lib.o"
 bc_help="\$(GEN_DIR)/bc_help.o"
 dc_help="\$(GEN_DIR)/dc_help.o"

 if [ "$bc_only" -eq 1 ]; then

 	bc=1
 	dc=0

 	dc_help=""

 	executables="bc"

 	dc_test="@printf 'No dc tests to run\\\\n'"
 	vg_dc_test="@printf 'No dc tests to run\\\\n'"

 	install_prereqs=" install_bc_manpage"
 	uninstall_prereqs=" uninstall_bc"
 	uninstall_man_prereqs=" uninstall_bc_manpage"

 elif [ "$dc_only" -eq 1 ]; then

 	bc=0
 	dc=1

 	bc_lib=""
 	bc_help=""

 	printf 'dc only; disabling references...\n'
 	refs=0

 	executables="dc"

 	main_exec="DC_EXEC"

 	bc_test="@printf 'No bc tests to run\\\\n'"
 	vg_bc_test="@printf 'No bc tests to run\\\\n'"

 	timeconst="@printf 'timeconst cannot be run because bc is not built\\\\n'"

 	install_prereqs=" install_dc_manpage"
 	uninstall_prereqs=" uninstall_dc"
 	uninstall_man_prereqs=" uninstall_dc_manpage"

 else

 	bc=1
 	dc=1

 	executables="bc and dc"

 	link="\$(LINK) \$(BIN) \$(DC)"

 	karatsuba="@\$(KARATSUBA)"
 	karatsuba_test="@\$(KARATSUBA) 100 \$(BC_EXEC)"

 	install_prereqs=" install_bc_manpage install_dc_manpage"
 	uninstall_prereqs=" uninstall_bc uninstall_dc"
 	uninstall_man_prereqs=" uninstall_bc_manpage uninstall_dc_manpage"

 fi

 if [ "$HOSTCFLAGS" = "" -a "$HOST_CFLAGS" = "" ]; then
 	HOSTCFLAGS="$CFLAGS"
 elif [ "$HOSTCFLAGS" = "" ]; then
 	HOSTCFLAGS="$HOST_CFLAGS"
 fi

 if [ "$debug" -eq 1 ]; then

 	if [ "$CFLAGS" = "" -a "$optimization" = "" ]; then
 		CFLAGS="-Og"
 	fi

 	CFLAGS="$CFLAGS -g"

 else
 	CPPFLAGS="$CPPFLAGS -DNDEBUG"
 	LDFLAGS="$LDFLAGS -s"
 fi

 if [ "$optimization" != "" ]; then
 	CFLAGS="$CFLAGS -O$optimization"
 fi

 if [ "$coverage" -eq 1 ]; then

 	if [ "$bc_only" -eq 1 -o "$dc_only" -eq 1 ]; then
 		usage "Can only specify -c without -b or -d"
 	fi

 	CFLAGS="$CFLAGS -fprofile-arcs -ftest-coverage -g -O0"
 	CPPFLAGS="$CPPFLAGS -DNDEBUG"

 	COVERAGE="@gcov -pabcdf \$(GCDA) \$(BC_GCDA) \$(DC_GCDA)"
 	COVERAGE="$COVERAGE;\$(RM) -f \$(GEN)*.gc*"
 	COVERAGE="$COVERAGE;gcovr --html-details --output index.html"
 	COVERAGE_PREREQS=" test"

 else
 	COVERAGE="@printf 'Coverage not generated\\\\n'"
 	COVERAGE_PREREQS=""
 fi

 if [ "$PREFIX" = "" ]; then
 	PREFIX="/usr/local"
 fi

 if [ "$BINDIR" = "" ]; then
 	BINDIR="$PREFIX/bin"
 fi

 if [ "$install_manpages" -ne 0 ]; then

 	if [ "$DATAROOTDIR" = "" ]; then
 		DATAROOTDIR="$PREFIX/share"
 	fi

 	if [ "$DATADIR" = "" ]; then
 		DATADIR="$DATAROOTDIR"
 	fi

 	if [ "$MANDIR" = "" ]; then
 		MANDIR="$DATADIR/man"
 	fi

 	if [ "$MAN1DIR" = "" ]; then
 		MAN1DIR="$MANDIR/man1"
 	fi

 else
 	install_prereqs=""
 	uninstall_man_prereqs=""
 fi

 if [ "$CC" = "" ]; then
 	CC="c99"
 fi

 if [ "$HOSTCC" = "" -a "$HOST_CC" = "" ]; then
 	HOSTCC="$CC"
 elif [ "$HOSTCC" = "" ]; then
 	HOSTCC="$HOST_CC"
 fi

 if [ "$hist" -eq 1 ]; then

 	set +e

 	printf 'Testing history...\n'

 	flags="-DBC_ENABLE_HISTORY=1 -DBC_ENABLED=$bc -DDC_ENABLED=$dc -DBC_ENABLE_SIGNALS=$signals"
 	flags="$flags -DBC_ENABLE_EXTRA_MATH=$extra_math -DBC_ENABLE_REFERENCES=$refs -I./include/"

 	"$CC" $CFLAGS $flags -c "src/history/history.c" > /dev/null 2>&1

 	err="$?"

 	rm -rf "$scriptdir/history.o"

 	# If this errors, it is probably because of building on Windows,
 	# and history is not supported on Windows, so disable it.
 	if [ "$err" -ne 0 ]; then
 		printf 'History does not work.\n'
 		printf 'Disabling history...\n'
 		hist=0
 	else
 		printf 'History works.\n'
 	fi

 	set -e

 fi

 if [ "$extra_math" -eq 1 -a "$bc" -ne 0 ]; then
 	BC_LIB2_O="\$(GEN_DIR)/lib2.o"
 else
 	BC_LIB2_O=""
 fi

 printf '\n'
 printf 'CC=%s\n' "$CC"
 printf 'CFLAGS=%s\n' "$CFLAGS"
 printf 'HOSTCC=%s\n' "$HOSTCC"
 printf 'HOSTCFLAGS=%s\n' "$HOSTCFLAGS"
 printf 'CPPFLAGS=%s\n' "$CPPFLAGS"
 printf 'LDFLAGS=%s\n' "$LDFLAGS"
 printf 'PREFIX=%s\n' "$PREFIX"
 printf 'BINDIR=%s\n' "$BINDIR"
 printf 'DATAROOTDIR=%s\n' "$DATAROOTDIR"
 printf 'DATADIR=%s\n' "$DATADIR"
 printf 'MANDIR=%s\n' "$MANDIR"
 printf 'MAN1DIR=%s\n' "$MAN1DIR"
 printf 'EXECSUFFIX=%s\n' "$EXECSUFFIX"
 printf 'DESTDIR=%s\n' "$DESTDIR"
 printf 'GEN_EMU=%s\n' "$GEN_EMU"

 contents=$(cat "$scriptdir/Makefile.in")

 needle="WARNING"
 replacement='*** WARNING: Autogenerated from Makefile.in. DO NOT MODIFY ***'

 contents=$(replace "$contents" "$needle" "$replacement")

 contents=$(gen_file_lists "$contents" "$scriptdir/src" "")
 contents=$(gen_file_lists "$contents" "$scriptdir/src/bc" "BC_" "$bc")
 contents=$(gen_file_lists "$contents" "$scriptdir/src/dc" "DC_" "$dc")
 contents=$(gen_file_lists "$contents" "$scriptdir/src/history" "HISTORY_" "$hist")

 contents=$(replace "$contents" "BC_ENABLED" "$bc")
 contents=$(replace "$contents" "DC_ENABLED" "$dc")
 contents=$(replace "$contents" "LINK" "$link")

 contents=$(replace "$contents" "SIGNALS" "$signals")
 contents=$(replace "$contents" "HISTORY" "$hist")
 contents=$(replace "$contents" "REFERENCES" "$refs")
 contents=$(replace "$contents" "EXTRA_MATH" "$extra_math")
 contents=$(replace "$contents" "BC_LIB_O" "$bc_lib")
 contents=$(replace "$contents" "BC_HELP_O" "$bc_help")
 contents=$(replace "$contents" "DC_HELP_O" "$dc_help")
 contents=$(replace "$contents" "BC_LIB2_O" "$BC_LIB2_O")
 contents=$(replace "$contents" "KARATSUBA_LEN" "$karatsuba_len")

 contents=$(replace "$contents" "DESTDIR" "$DESTDIR")
 contents=$(replace "$contents" "EXECSUFFIX" "$EXECSUFFIX")
 contents=$(replace "$contents" "BINDIR" "$BINDIR")
 contents=$(replace "$contents" "MAN1DIR" "$MAN1DIR")
 contents=$(replace "$contents" "CFLAGS" "$CFLAGS")
 contents=$(replace "$contents" "HOSTCFLAGS" "$HOSTCFLAGS")
 contents=$(replace "$contents" "CPPFLAGS" "$CPPFLAGS")
 contents=$(replace "$contents" "LDFLAGS" "$LDFLAGS")
 contents=$(replace "$contents" "CC" "$CC")
 contents=$(replace "$contents" "HOSTCC" "$HOSTCC")
 contents=$(replace "$contents" "COVERAGE" "$COVERAGE")
 contents=$(replace "$contents" "COVERAGE_PREREQS" "$COVERAGE_PREREQS")
 contents=$(replace "$contents" "INSTALL_PREREQS" "$install_prereqs")
 contents=$(replace "$contents" "UNINSTALL_MAN_PREREQS" "$uninstall_man_prereqs")
 contents=$(replace "$contents" "UNINSTALL_PREREQS" "$uninstall_prereqs")

 contents=$(replace "$contents" "EXECUTABLES" "$executables")
 contents=$(replace "$contents" "MAIN_EXEC" "$main_exec")

 contents=$(replace "$contents" "BC_TEST" "$bc_test")
 contents=$(replace "$contents" "DC_TEST" "$dc_test")

 contents=$(replace "$contents" "VG_BC_TEST" "$vg_bc_test")
 contents=$(replace "$contents" "VG_DC_TEST" "$vg_dc_test")

 contents=$(replace "$contents" "TIMECONST" "$timeconst")

 contents=$(replace "$contents" "KARATSUBA" "$karatsuba")
 contents=$(replace "$contents" "KARATSUBA_TEST" "$karatsuba_test")

 contents=$(replace "$contents" "GEN_EMU" "$GEN_EMU")

 printf '%s\n' "$contents" > "$scriptdir/Makefile"

 cd "$scriptdir"

 make clean > /dev/null
	#! /bin/sh
	#
	# Copyright 2018 Gavin D. Howard
	#
	# Permission to use, copy, modify, and/or distribute this software for any
	# purpose with or without fee is hereby granted.
	#
	# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
	# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
	# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
	# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
	# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
	# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	# PERFORMANCE OF THIS SOFTWARE.
	#

	usage() {

	if [ $# -gt 0 ]; then

	val=1

	printf "%s\n\n" "$1"

	else
	val=0
	fi

	printf 'usage: %s [-bD\|-dB\|-c] [-EgGhHMRS] [-O OPT_LEVEL] [-k KARATSUBA_LEN]\n' "$0"
	printf '\n'
	printf ' -b\n'
	printf ' Build bc only. It is an error if "-d" or "-B" are specified too.\n'
	printf ' -B\n'
	printf ' Disable bc. It is an error if "-b" or "-D" are specified too.\n'
	printf ' -c\n'
	printf ' Generate test coverage code. Requires gcov and regcovr.\n'
	printf ' It is an error if either "-b" ("-D") or "-d" ("-B") is specified.\n'
	printf ' Requires a compiler that use gcc-compatible coverage options\n'
	printf ' -d\n'
	printf ' Build dc only. It is an error if "-b" is specified too.\n'
	printf ' -D\n'
	printf ' Disable dc. It is an error if "-d" or "-B" are specified too.\n'
	printf ' -E\n'
	printf ' Disable extra math. This includes: "$" operator (truncate to integer),\n'
	printf ' "@" operator (set number of decimal places), and r(x, p) (rounding\n'
	printf ' function). Additionally, this option disables the extra printing\n'
	printf ' functions in the math library.\n'
	printf ' -g\n'
	printf ' Build in debug mode. Adds the "-g" flag, and if there are no\n'
	printf ' other CFLAGS, and "-O" was not given, this also adds the "-O0"\n'
	printf ' flag. If this flag is not given, "-DNDEBUG" is added to CPPFLAGS\n'
	printf ' and a strip flag is added to the link stage.\n'
	printf ' -G\n'
	printf ' Disable generating tests. This is for platforms that do not have a\n'
	printf ' GNU bc-compatible bc to generate tests.\n'
	printf ' -h\n'
	printf ' Print this help message and exit.\n'
	printf ' -H\n'
	printf ' Disable history.\n'
	printf ' -k KARATSUBA_LEN\n'
	printf ' Set the karatsuba length to KARATSUBA_LEN (default is 32).\n'
	printf ' It is an error if KARATSUBA_LEN is not a number or is less than 2.\n'
	printf ' It is an error if "-m" is specified too.\n'
	printf ' -M\n'
	printf ' Disable installing manpages.\n'
	printf ' -O OPT_LEVEL\n'
	printf ' Set the optimization level. This can also be included in the CFLAGS,\n'
	printf ' but it is provided, so maintainers can build optimized debug builds.\n'
	printf ' This is passed through to the compiler, so it must be supported.\n'
	printf ' -R\n'
	printf ' Disable the array references extension. This feature is an\n'
	printf ' undocumented feature of the GNU bc, but this bc supports it.\n'
	printf ' Additionally, since this feature is only available to bc,\n'
	printf ' specifying "-d" ("-B") implies this option.\n'
	printf ' -S\n'
	printf ' Disable signal handling. On by default.\n'
	printf '\n'
	printf 'In addition, the following environment variables are used:\n'
	printf '\n'
	printf ' CC C compiler. Must be compatible with POSIX c99.\n'
	printf ' Default is "c99".\n'
	printf ' HOSTCC Host C compiler. Must be compatible with POSIX c99.\n'
	printf ' Default is "$CC".\n'
	printf ' HOST_CC Same as HOSTCC. If HOSTCC also exists, it is used.\n'
	printf ' CFLAGS C compiler flags.\n'
	printf ' HOSTCFLAGS CFLAGS for HOSTCC. Default is "$CFLAGS".\n'
	printf ' HOST_CFLAGS Same as HOST_CFLAGS. If HOST_CFLAGS also exists, it is used.\n'
	printf ' CPPFLAGS C preprocessor flags. Default is "".\n'
	printf ' LDFLAGS Linker flags. Default is "".\n'
	printf ' PREFIX The prefix to install to. Default is "/usr/local".\n'
	printf ' If PREFIX is "/usr", install path will be "/usr/bin".\n'
	printf ' BINDIR The directory to install binaries. Default is "$PREFIX/bin".\n'
	printf ' DATAROOTDIR The root location for data files. Default is "$PREFIX/share".\n'
	printf ' DATADIR The location for data files. Default is "$DATAROOTDIR".\n'
	printf ' MANDIR The location to install manpages to. Default is "$DATADIR/man".\n'
	printf ' MAN1DIR The location to install Section 1 manpages to. Default is\n'
	printf ' "$MANDIR/man1".\n'
	printf ' EXECSUFFIX The suffix to append to the executable names, used to not\n'
	printf ' interfere with other installed bc executables. This can only\n'
	printf ' be a suffix because bc uses the first letter of the executable\n'
	printf ' name to switch between bc and dc. Default is "".\n'
	printf ' DESTDIR For package creation. Default is "".\n'
	printf ' GEN_EMU Emulator to run string generator code under\n'
	printf ' (leave empty if not necessary). Default is "".\n'

	exit "$val"
	}

	err_exit() {

	if [ "$#" -ne 1 ]; then
	printf 'Invalid number of args to err_exit\n'
	exit 1
	fi

	printf '%s\n' "$1"
	exit 1
	}

	replace_ext() {

	if [ "$#" -ne 3 ]; then
	err_exit "Invalid number of args to $0"
	fi

	file="$1"
	ext1="$2"
	ext2="$3"

	result=$(printf "$file" \| sed -e "s@\.$ext1@\.$ext2@")

	printf '%s\n' "$result"
	}

	replace_exts() {

	if [ "$#" -ne 3 ]; then
	err_exit "Invalid number of args to $0"
	fi

	files="$1"
	ext1="$2"
	ext2="$3"

	for file in $files; do
	new_name=$(replace_ext "$file" "$ext1" "$ext2")
	result="$result $new_name"
	done

	printf '%s\n' "$result"
	}

	replace() {

	if [ "$#" -ne 3 ]; then
	err_exit "Invalid number of args to $0"
	fi

	str="$1"
	needle="$2"
	replacement="$3"

	result=$(printf '%s' "$str" \| sed -e "s!%%$needle%%!$replacement!g")

	printf '%s\n' "$result"
	}

	gen_file_lists() {

	if [ "$#" -lt 3 ]; then
	err_exit "Invalid number of args to $0"
	fi

	contents="$1"
	shift

	filedir="$1"
	shift

	typ="$1"
	shift

	# If there is an extra argument, and it
	# is zero, we keep the file lists empty.
	if [ "$#" -gt 0 ]; then
	use="$1"
	else
	use="1"
	fi

	needle_src="${typ}SRC"
	needle_obj="${typ}OBJ"
	needle_gcda="${typ}GCDA"
	needle_gcno="${typ}GCNO"

	if [ "$use" -ne 0 ]; then

	replacement=$(ls $filedir/*.c \| tr '\n' ' ')
	contents=$(replace "$contents" "$needle_src" "$replacement")

	replacement=$(replace_exts "$replacement" "c" "o")
	contents=$(replace "$contents" "$needle_obj" "$replacement")

	replacement=$(replace_exts "$replacement" "o" "gcda")
	contents=$(replace "$contents" "$needle_gcda" "$replacement")

	replacement=$(replace_exts "$replacement" "gcda" "gcno")
	contents=$(replace "$contents" "$needle_gcno" "$replacement")

	else
	contents=$(replace "$contents" "$needle_src" "")
	contents=$(replace "$contents" "$needle_obj" "")
	contents=$(replace "$contents" "$needle_gcda" "")
	contents=$(replace "$contents" "$needle_gcno" "")
	fi

	printf '%s\n' "$contents"
	}

	bc_only=0
	dc_only=0
	coverage=0
	karatsuba_len=32
	debug=0
	signals=1
	hist=1
	refs=1
	extra_math=1
	optimization=""
	generate_tests=1
	install_manpages=1

	while getopts "bBcdDEgGhHk:MO:RS" opt; do

	case "$opt" in
	b) bc_only=1 ;;
	B) dc_only=1 ;;
	c) coverage=1 ;;
	d) dc_only=1 ;;
	D) bc_only=1 ;;
	E) extra_math=0 ;;
	g) debug=1 ;;
	G) generate_tests=0 ;;
	h) usage ;;
	H) hist=0 ;;
	k) karatsuba_len="$OPTARG" ;;
	M) install_manpages=0 ;;
	O) optimization="$OPTARG" ;;
	R) refs=0 ;;
	S) signals=0 ;;
	?) usage "Invalid option" ;;
	esac

	done

	if [ "$bc_only" -eq 1 -a "$dc_only" -eq 1 ]; then
	usage "Can only specify one of -b(-D) or -d(-B)"
	fi

	case $karatsuba_len in
	([!0-9]\|'') usage "KARATSUBA_LEN is not a number" ;;
	(*) ;;
	esac

	if [ "$karatsuba_len" -lt 2 ]; then
	usage "KARATSUBA_LEN is less than 2"
	fi

	set -e

	script="$0"

	scriptdir=$(dirname "$script")

	link="@printf 'No link necessary\\\\n'"
	main_exec="BC_EXEC"

	bc_test="@tests/all.sh bc $extra_math $refs $generate_tests"
	dc_test="@tests/all.sh dc $extra_math $refs $generate_tests"

	timeconst="@tests/bc/timeconst.sh"

	# In order to have cleanup at exit, we need to be in
	# debug mode, so don't run valgrind without that.
	if [ "$debug" -ne 0 ]; then
	vg_bc_test="@tests/all.sh bc $extra_math $refs $generate_tests valgrind \$(VALGRIND_ARGS) \$(BC_EXEC)"
	vg_dc_test="@tests/all.sh dc $extra_math $refs $generate_tests valgrind \$(VALGRIND_ARGS) \$(DC_EXEC)"
	else
	vg_bc_test="@printf 'Cannot run valgrind without debug flags\\\\n'"
	vg_dc_test="@printf 'Cannot run valgrind without debug flags\\\\n'"
	fi

	karatsuba="@printf 'karatsuba cannot be run because one of bc or dc is not built\\\\n'"
	karatsuba_test="@printf 'karatsuba cannot be run because one of bc or dc is not built\\\\n'"

	bc_lib="\$(GEN_DIR)/lib.o"
	bc_help="\$(GEN_DIR)/bc_help.o"
	dc_help="\$(GEN_DIR)/dc_help.o"

	if [ "$bc_only" -eq 1 ]; then

	bc=1
	dc=0

	dc_help=""

	executables="bc"

	dc_test="@printf 'No dc tests to run\\\\n'"
	vg_dc_test="@printf 'No dc tests to run\\\\n'"

	install_prereqs=" install_bc_manpage"
	uninstall_prereqs=" uninstall_bc"
	uninstall_man_prereqs=" uninstall_bc_manpage"

	elif [ "$dc_only" -eq 1 ]; then

	bc=0
	dc=1

	bc_lib=""
	bc_help=""

	printf 'dc only; disabling references...\n'
	refs=0

	executables="dc"

	main_exec="DC_EXEC"

	bc_test="@printf 'No bc tests to run\\\\n'"
	vg_bc_test="@printf 'No bc tests to run\\\\n'"

	timeconst="@printf 'timeconst cannot be run because bc is not built\\\\n'"

	install_prereqs=" install_dc_manpage"
	uninstall_prereqs=" uninstall_dc"
	uninstall_man_prereqs=" uninstall_dc_manpage"

	else

	bc=1
	dc=1

	executables="bc and dc"

	link="\$(LINK) \$(BIN) \$(DC)"

	karatsuba="@\$(KARATSUBA)"
	karatsuba_test="@\$(KARATSUBA) 100 \$(BC_EXEC)"

	install_prereqs=" install_bc_manpage install_dc_manpage"
	uninstall_prereqs=" uninstall_bc uninstall_dc"
	uninstall_man_prereqs=" uninstall_bc_manpage uninstall_dc_manpage"

	fi

	if [ "$HOSTCFLAGS" = "" -a "$HOST_CFLAGS" = "" ]; then
	HOSTCFLAGS="$CFLAGS"
	elif [ "$HOSTCFLAGS" = "" ]; then
	HOSTCFLAGS="$HOST_CFLAGS"
	fi

	if [ "$debug" -eq 1 ]; then

	if [ "$CFLAGS" = "" -a "$optimization" = "" ]; then
	CFLAGS="-Og"
	fi

	CFLAGS="$CFLAGS -g"

	else
	CPPFLAGS="$CPPFLAGS -DNDEBUG"
	LDFLAGS="$LDFLAGS -s"
	fi

	if [ "$optimization" != "" ]; then
	CFLAGS="$CFLAGS -O$optimization"
	fi

	if [ "$coverage" -eq 1 ]; then

	if [ "$bc_only" -eq 1 -o "$dc_only" -eq 1 ]; then
	usage "Can only specify -c without -b or -d"
	fi

	CFLAGS="$CFLAGS -fprofile-arcs -ftest-coverage -g -O0"
	CPPFLAGS="$CPPFLAGS -DNDEBUG"

	COVERAGE="@gcov -pabcdf \$(GCDA) \$(BC_GCDA) \$(DC_GCDA)"
	COVERAGE="$COVERAGE;\$(RM) -f \$(GEN).gc"
	COVERAGE="$COVERAGE;gcovr --html-details --output index.html"
	COVERAGE_PREREQS=" test"

	else
	COVERAGE="@printf 'Coverage not generated\\\\n'"
	COVERAGE_PREREQS=""
	fi

	if [ "$PREFIX" = "" ]; then
	PREFIX="/usr/local"
	fi

	if [ "$BINDIR" = "" ]; then
	BINDIR="$PREFIX/bin"
	fi

	if [ "$install_manpages" -ne 0 ]; then

	if [ "$DATAROOTDIR" = "" ]; then
	DATAROOTDIR="$PREFIX/share"
	fi

	if [ "$DATADIR" = "" ]; then
	DATADIR="$DATAROOTDIR"
	fi

	if [ "$MANDIR" = "" ]; then
	MANDIR="$DATADIR/man"
	fi

	if [ "$MAN1DIR" = "" ]; then
	MAN1DIR="$MANDIR/man1"
	fi

	else
	install_prereqs=""
	uninstall_man_prereqs=""
	fi

	if [ "$CC" = "" ]; then
	CC="c99"
	fi

	if [ "$HOSTCC" = "" -a "$HOST_CC" = "" ]; then
	HOSTCC="$CC"
	elif [ "$HOSTCC" = "" ]; then
	HOSTCC="$HOST_CC"
	fi

	if [ "$hist" -eq 1 ]; then

	set +e

	printf 'Testing history...\n'

	flags="-DBC_ENABLE_HISTORY=1 -DBC_ENABLED=$bc -DDC_ENABLED=$dc -DBC_ENABLE_SIGNALS=$signals"
	flags="$flags -DBC_ENABLE_EXTRA_MATH=$extra_math -DBC_ENABLE_REFERENCES=$refs -I./include/"

	"$CC" $CFLAGS $flags -c "src/history/history.c" > /dev/null 2>&1

	err="$?"

	rm -rf "$scriptdir/history.o"

	# If this errors, it is probably because of building on Windows,
	# and history is not supported on Windows, so disable it.
	if [ "$err" -ne 0 ]; then
	printf 'History does not work.\n'
	printf 'Disabling history...\n'
	hist=0
	else
	printf 'History works.\n'
	fi

	set -e

	fi

	if [ "$extra_math" -eq 1 -a "$bc" -ne 0 ]; then
	BC_LIB2_O="\$(GEN_DIR)/lib2.o"
	else
	BC_LIB2_O=""
	fi

	printf '\n'
	printf 'CC=%s\n' "$CC"
	printf 'CFLAGS=%s\n' "$CFLAGS"
	printf 'HOSTCC=%s\n' "$HOSTCC"
	printf 'HOSTCFLAGS=%s\n' "$HOSTCFLAGS"
	printf 'CPPFLAGS=%s\n' "$CPPFLAGS"
	printf 'LDFLAGS=%s\n' "$LDFLAGS"
	printf 'PREFIX=%s\n' "$PREFIX"
	printf 'BINDIR=%s\n' "$BINDIR"
	printf 'DATAROOTDIR=%s\n' "$DATAROOTDIR"
	printf 'DATADIR=%s\n' "$DATADIR"
	printf 'MANDIR=%s\n' "$MANDIR"
	printf 'MAN1DIR=%s\n' "$MAN1DIR"
	printf 'EXECSUFFIX=%s\n' "$EXECSUFFIX"
	printf 'DESTDIR=%s\n' "$DESTDIR"
	printf 'GEN_EMU=%s\n' "$GEN_EMU"

	contents=$(cat "$scriptdir/Makefile.in")

	needle="WARNING"
	replacement='* WARNING: Autogenerated from Makefile.in. DO NOT MODIFY *'

	contents=$(replace "$contents" "$needle" "$replacement")

	contents=$(gen_file_lists "$contents" "$scriptdir/src" "")
	contents=$(gen_file_lists "$contents" "$scriptdir/src/bc" "BC_" "$bc")
	contents=$(gen_file_lists "$contents" "$scriptdir/src/dc" "DC_" "$dc")
	contents=$(gen_file_lists "$contents" "$scriptdir/src/history" "HISTORY_" "$hist")

	contents=$(replace "$contents" "BC_ENABLED" "$bc")
	contents=$(replace "$contents" "DC_ENABLED" "$dc")
	contents=$(replace "$contents" "LINK" "$link")

	contents=$(replace "$contents" "SIGNALS" "$signals")
	contents=$(replace "$contents" "HISTORY" "$hist")
	contents=$(replace "$contents" "REFERENCES" "$refs")
	contents=$(replace "$contents" "EXTRA_MATH" "$extra_math")
	contents=$(replace "$contents" "BC_LIB_O" "$bc_lib")
	contents=$(replace "$contents" "BC_HELP_O" "$bc_help")
	contents=$(replace "$contents" "DC_HELP_O" "$dc_help")
	contents=$(replace "$contents" "BC_LIB2_O" "$BC_LIB2_O")
	contents=$(replace "$contents" "KARATSUBA_LEN" "$karatsuba_len")

	contents=$(replace "$contents" "DESTDIR" "$DESTDIR")
	contents=$(replace "$contents" "EXECSUFFIX" "$EXECSUFFIX")
	contents=$(replace "$contents" "BINDIR" "$BINDIR")
	contents=$(replace "$contents" "MAN1DIR" "$MAN1DIR")
	contents=$(replace "$contents" "CFLAGS" "$CFLAGS")
	contents=$(replace "$contents" "HOSTCFLAGS" "$HOSTCFLAGS")
	contents=$(replace "$contents" "CPPFLAGS" "$CPPFLAGS")
	contents=$(replace "$contents" "LDFLAGS" "$LDFLAGS")
	contents=$(replace "$contents" "CC" "$CC")
	contents=$(replace "$contents" "HOSTCC" "$HOSTCC")
	contents=$(replace "$contents" "COVERAGE" "$COVERAGE")
	contents=$(replace "$contents" "COVERAGE_PREREQS" "$COVERAGE_PREREQS")
	contents=$(replace "$contents" "INSTALL_PREREQS" "$install_prereqs")
	contents=$(replace "$contents" "UNINSTALL_MAN_PREREQS" "$uninstall_man_prereqs")
	contents=$(replace "$contents" "UNINSTALL_PREREQS" "$uninstall_prereqs")

	contents=$(replace "$contents" "EXECUTABLES" "$executables")
	contents=$(replace "$contents" "MAIN_EXEC" "$main_exec")

	contents=$(replace "$contents" "BC_TEST" "$bc_test")
	contents=$(replace "$contents" "DC_TEST" "$dc_test")

	contents=$(replace "$contents" "VG_BC_TEST" "$vg_bc_test")
	contents=$(replace "$contents" "VG_DC_TEST" "$vg_dc_test")

	contents=$(replace "$contents" "TIMECONST" "$timeconst")

	contents=$(replace "$contents" "KARATSUBA" "$karatsuba")
	contents=$(replace "$contents" "KARATSUBA_TEST" "$karatsuba_test")

	contents=$(replace "$contents" "GEN_EMU" "$GEN_EMU")

	printf '%s\n' "$contents" > "$scriptdir/Makefile"

	cd "$scriptdir"

	make clean > /dev/null