#!/bin/sh

set -eu
umask 022

SELF_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
cd "$SELF_DIR"

TMP_DIR="$SELF_DIR/build/configure"
LOG_FILE="$TMP_DIR/config.log"
CONFIG_MK="$SELF_DIR/config.mk"
GNUMAKEFILE="$SELF_DIR/GNUmakefile"

mkdir -p "$TMP_DIR"
: >"$LOG_FILE"

PREFIX="/usr/local"
BINDIR=""
BINDIR_SET=0
LOCAL_DIR="/usr/local"
ALLOW_GLIBC=0
FAIL_IF_MISSING=0
USER_CC=""
HOST=""
BUILD=""
EXTRA_CPPFLAGS=""
EXTRA_CFLAGS=""
EXTRA_LDFLAGS=""

ENV_CC=${CC-}
ENV_CPPFLAGS=${CPPFLAGS-}
ENV_CFLAGS=${CFLAGS-}
ENV_LDFLAGS=${LDFLAGS-}

usage() {
	cat <<'USAGE'
Usage: ./configure [options]

General:
  --help                         show this help
  --prefix=PATH                  install prefix (default: /usr/local)
  --bindir=PATH                  install bindir (default: <prefix>/bin)
  --host=TRIPLE                  target host triple
  --build=TRIPLE                 build triple

Toolchain:
  --cc=COMMAND                   force compiler command
  --allow-glibc                  allow glibc toolchain fallback

Flags:
  --extra-cppflags=FLAGS         extra CPPFLAGS
  --extra-cflags=FLAGS           extra CFLAGS
  --extra-ldflags=FLAGS          extra LDFLAGS

Local paths:
  --with-local-dir=PATH          add PATH/include and PATH/lib when present
  --without-local-dir            disable local include/lib probing

Policy:
  --enable-fail-if-missing       fail when optional probes are missing
USAGE
}

msg_checking() {
	printf 'checking %s... ' "$1"
}

msg_result() {
	printf '%s\n' "$1"
}

warn() {
	printf 'configure: warning: %s\n' "$*" >&2
}

die() {
	printf 'configure: error: %s\n' "$*" >&2
	exit 1
}

normalize_ws() {
	printf '%s' "$1" | sed 's/[[:space:]][[:space:]]*/ /g; s/^ //; s/ $//'
}

escape_make() {
	printf '%s' "$1" | sed 's/\$/$$/g'
}

escape_sed() {
	printf '%s' "$1" | sed 's/[\\/&]/\\&/g'
}

to_macro() {
	printf '%s' "$1" | tr '/.-' '___' | tr '[:lower:]' '[:upper:]'
}

choose_tool() {
	tool_var=$1
	shift
	for candidate in "$@"; do
		if [ -n "$candidate" ] && command -v "$candidate" >/dev/null 2>&1; then
			eval "$tool_var=\$candidate"
			return 0
		fi
	done
	return 1
}

can_compile_with() {
	cc_try=$1
	cat >"$TMP_DIR/conftest.c" <<'SRC'
int main(void) { return 0; }
SRC
	printf '$ %s\n' "$cc_try -x c $TMP_DIR/conftest.c -o $TMP_DIR/conftest" >>"$LOG_FILE"
	if sh -c "$cc_try -x c '$TMP_DIR/conftest.c' -o '$TMP_DIR/conftest'" >>"$LOG_FILE" 2>&1; then
		return 0
	fi
	return 1
}

can_run_with() {
	cc_try=$1
	cat >"$TMP_DIR/conftest.c" <<'SRC'
#include <stdio.h>
#include <stdlib.h>
int main(void) {
	char *ep = NULL;
	long v = strtol("1", &ep, 10);
	char buf[8];
	(void)snprintf(buf, sizeof(buf), "%ld", v);
	return (ep == NULL || buf[0] != '1');
}
SRC
	printf '$ %s\n' "$cc_try -D_GNU_SOURCE -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=700 -x c $TMP_DIR/conftest.c -o $TMP_DIR/conftest" >>"$LOG_FILE"
	if ! sh -c "$cc_try -D_GNU_SOURCE -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=700 -x c '$TMP_DIR/conftest.c' -o '$TMP_DIR/conftest'" >>"$LOG_FILE" 2>&1; then
		return 1
	fi
	printf '$ %s\n' "$TMP_DIR/conftest" >>"$LOG_FILE"
	if "$TMP_DIR/conftest" >>"$LOG_FILE" 2>&1; then
		return 0
	fi
	return 1
}

can_compile_stdatomic_with() {
	cc_try=$1
	cat >"$TMP_DIR/conftest.c" <<'SRC'
#include <stdatomic.h>
int main(void) {
	_Atomic int x = 1;
	return (int)x - 1;
}
SRC
	printf '$ %s\n' "$cc_try -x c $TMP_DIR/conftest.c -o $TMP_DIR/conftest" >>"$LOG_FILE"
	if sh -c "$cc_try -x c '$TMP_DIR/conftest.c' -o '$TMP_DIR/conftest'" >>"$LOG_FILE" 2>&1; then
		return 0
	fi
	return 1
}

pick_compiler() {
	cc_try=$1
	[ -n "$cc_try" ] || return 1
	set -- $cc_try
	cc_prog=$1
	command -v "$cc_prog" >/dev/null 2>&1 || return 1
	if can_compile_with "$cc_try"; then
		if [ "$REQUIRE_RUNNABLE_CC" -eq 1 ] && ! can_run_with "$cc_try"; then
			return 1
		fi
		if ! can_compile_stdatomic_with "$cc_try"; then
			return 1
		fi
		CC_SELECTED=$cc_try
		return 0
	fi
	return 1
}

try_cc() {
	code=$1
	extra_cppflags=${2-}
	extra_ldflags=${3-}
	cat >"$TMP_DIR/conftest.c" <<SRC
$code
SRC
	printf '$ %s\n' "$CC_SELECTED $CFG_CPPFLAGS $extra_cppflags $CFG_CFLAGS $CFG_LDFLAGS $extra_ldflags $TMP_DIR/conftest.c -o $TMP_DIR/conftest" >>"$LOG_FILE"
	if sh -c "$CC_SELECTED $CFG_CPPFLAGS $extra_cppflags $CFG_CFLAGS $CFG_LDFLAGS $extra_ldflags '$TMP_DIR/conftest.c' -o '$TMP_DIR/conftest'" >>"$LOG_FILE" 2>&1; then
		return 0
	fi
	return 1
}

record_cpp_define() {
	name=$1
	value=$2
	printf '%s := %s\n' "$name" "$value" >>"$CONFIG_MK_TMP"
	if [ "$value" = "1" ]; then
		CONF_CPPFLAGS="$CONF_CPPFLAGS -D${name}=1"
	fi
}

check_header() {
	hdr=$1
	macro="HAVE_$(to_macro "$hdr")"
	msg_checking "for $hdr"
	if try_cc "#include <$hdr>
int main(void) { return 0; }" "" ""; then
		msg_result yes
		record_cpp_define "$macro" 1
	else
		msg_result no
		record_cpp_define "$macro" 0
	fi
}

check_func() {
	func=$1
	includes=$2
	macro="HAVE_$(to_macro "$func")"
	msg_checking "for $func"
	if try_cc "$includes
#include <stdint.h>
int main(void) { void *p = (void *)(uintptr_t)&$func; return p == 0; }" "" ""; then
		msg_result yes
		record_cpp_define "$macro" 1
	else
		msg_result no
		record_cpp_define "$macro" 0
	fi
}

check_lib_symbol() {
	lib=$1
	sym=$2
	msg_checking "for $sym in -l$lib"
	if try_cc "char $sym();
int main(void) { return $sym() == 0; }" "" "-l$lib"; then
		msg_result yes
		return 0
	fi
	msg_result no
	return 1
}

for arg in "$@"; do
	case "$arg" in
	--help)
		usage
		exit 0
		;;
	--prefix=*)
		PREFIX=${arg#*=}
		;;
	--bindir=*)
		BINDIR=${arg#*=}
		BINDIR_SET=1
		;;
	--host=*)
		HOST=${arg#*=}
		;;
	--build=*)
		BUILD=${arg#*=}
		;;
	--cc=*)
		USER_CC=${arg#*=}
		;;
	--allow-glibc)
		ALLOW_GLIBC=1
		;;
	--enable-fail-if-missing)
		FAIL_IF_MISSING=1
		;;
	--with-local-dir=*)
		LOCAL_DIR=${arg#*=}
		;;
	--without-local-dir)
		LOCAL_DIR=no
		;;
	--extra-cppflags=*)
		EXTRA_CPPFLAGS=${arg#*=}
		;;
	--extra-cflags=*)
		EXTRA_CFLAGS=${arg#*=}
		;;
	--extra-ldflags=*)
		EXTRA_LDFLAGS=${arg#*=}
		;;
	*)
		die "unknown option: $arg"
		;;
	esac
done

if [ "$BINDIR_SET" -ne 1 ]; then
	BINDIR="$PREFIX/bin"
fi

HOST_OS=$(uname -s 2>/dev/null || echo unknown)
HOST_ARCH=$(uname -m 2>/dev/null || echo unknown)
DEFAULT_TRIPLE="${HOST_ARCH}-unknown-${HOST_OS}"
[ -n "$HOST" ] || HOST="$DEFAULT_TRIPLE"
[ -n "$BUILD" ] || BUILD="$DEFAULT_TRIPLE"
REQUIRE_RUNNABLE_CC=0
if [ "$HOST" = "$BUILD" ]; then
	REQUIRE_RUNNABLE_CC=1
fi

msg_checking "for C compiler"
CC_SELECTED=""
if [ -n "$USER_CC" ]; then
	pick_compiler "$USER_CC" || die "requested compiler is not usable: $USER_CC"
elif [ -n "$ENV_CC" ]; then
	if ! pick_compiler "$ENV_CC"; then
		warn "environment CC unusable or disallowed: $ENV_CC"
	fi
fi
if [ -z "$CC_SELECTED" ]; then
	pick_compiler "musl-clang" || true
fi
if [ -z "$CC_SELECTED" ]; then
	pick_compiler "clang --target=${HOST_ARCH}-linux-musl" || true
fi
if [ -z "$CC_SELECTED" ]; then
	pick_compiler "clang --target=${HOST_ARCH}-unknown-linux-musl" || true
fi
if [ -z "$CC_SELECTED" ]; then
	pick_compiler "musl-gcc" || true
fi
if [ -z "$CC_SELECTED" ]; then
	pick_compiler "clang" || true
fi
if [ -z "$CC_SELECTED" ]; then
	pick_compiler "cc" || true
fi
if [ -z "$CC_SELECTED" ]; then
	pick_compiler "gcc" || true
fi
[ -n "$CC_SELECTED" ] || die "no usable compiler found"
msg_result "$CC_SELECTED"

msg_checking "for C preprocessor"
if sh -c "$CC_SELECTED -E '$TMP_DIR/conftest.c'" >/dev/null 2>&1; then
	CPP_SELECTED="$CC_SELECTED -E"
	msg_result "$CPP_SELECTED"
else
	die "no working preprocessor via selected compiler"
fi

msg_checking "for make"
if choose_tool MAKE gmake make; then
	msg_result "$MAKE"
else
	die "no make tool found"
fi

msg_checking "for archiver"
if choose_tool AR llvm-ar ar; then
	msg_result "$AR"
else
	die "no archiver found"
fi

msg_checking "for ranlib"
if choose_tool RANLIB llvm-ranlib ranlib; then
	msg_result "$RANLIB"
else
	die "no ranlib found"
fi

msg_checking "for nm"
if choose_tool NM llvm-nm nm; then
	msg_result "$NM"
else
	msg_result no
	NM=:
fi

msg_checking "for awk"
if choose_tool AWK gawk mawk awk; then
	msg_result "$AWK"
else
	die "no awk found"
fi

msg_checking "for shell"
if choose_tool SH sh; then
	msg_result "$SH"
else
	die "no POSIX shell found"
fi

msg_checking "for pkg-config"
PKG_CONFIG=""
if choose_tool PKG_CONFIG pkgconf pkg-config; then
	msg_result "$PKG_CONFIG"
else
	msg_result no
fi

CC_MACHINE=$(sh -c "$CC_SELECTED -dumpmachine" 2>/dev/null || echo unknown)
msg_checking "target compiler triplet"
msg_result "$CC_MACHINE"

LIBC_KIND=unknown

if command -v file >/dev/null 2>&1; then
	cat >"$TMP_DIR/conftest.c" <<'SRC'
int main(void) { return 0; }
SRC
	printf '$ %s\n' "$CC_SELECTED -x c $TMP_DIR/conftest.c -o $TMP_DIR/conftest" >>"$LOG_FILE"
	if sh -c "$CC_SELECTED -x c '$TMP_DIR/conftest.c' -o '$TMP_DIR/conftest'" >>"$LOG_FILE" 2>&1; then
		FILE_TEXT=$(file "$TMP_DIR/conftest" 2>/dev/null || true)
		case "$FILE_TEXT" in
		*ld-musl*|*musl*)
			LIBC_KIND=musl
			;;
		*ld-linux*|*GNU/Linux*)
			LIBC_KIND=glibc
			;;
		esac
	fi
fi

if [ "$LIBC_KIND" = "unknown" ]; then
	CC_MACROS=$(printf '\n' | sh -c "$CC_SELECTED -dM -E -x c -" 2>/dev/null || true)
	case "$CC_MACROS" in
	*"__GLIBC__"*) LIBC_KIND=glibc ;;
	*"__MUSL__"*) LIBC_KIND=musl ;;
	esac
fi
if [ "$LIBC_KIND" = "unknown" ]; then
	case "$CC_MACHINE" in
	*musl*)
		LIBC_KIND=musl
		;;
	*gnu*|*glibc*)
		LIBC_KIND=glibc
		;;
	esac
fi

msg_checking "for libc type"
msg_result "$LIBC_KIND"

if [ "$LIBC_KIND" = "glibc" ] && [ "$ALLOW_GLIBC" -ne 1 ]; then
	die "glibc toolchain detected; refusing by default (use --allow-glibc to override)"
fi

IS_MUSL=0
if [ "$LIBC_KIND" = "musl" ]; then
	IS_MUSL=1
fi

CFG_CPPFLAGS=$(normalize_ws "-D_DEFAULT_SOURCE -D_XOPEN_SOURCE=700 $ENV_CPPFLAGS $EXTRA_CPPFLAGS")
CFG_CFLAGS=$(normalize_ws "-O2 -g -pipe $ENV_CFLAGS $EXTRA_CFLAGS")
CFG_LDFLAGS=$(normalize_ws "$ENV_LDFLAGS $EXTRA_LDFLAGS")

if [ "$LOCAL_DIR" != "no" ] && [ -n "$LOCAL_DIR" ]; then
	msg_checking "for local include directory"
	if [ -d "$LOCAL_DIR/include" ]; then
		CFG_CPPFLAGS=$(normalize_ws "$CFG_CPPFLAGS -I$LOCAL_DIR/include")
		msg_result "$LOCAL_DIR/include"
	else
		msg_result no
	fi

	msg_checking "for local library directory"
	if [ -d "$LOCAL_DIR/lib" ]; then
		CFG_LDFLAGS=$(normalize_ws "$CFG_LDFLAGS -L$LOCAL_DIR/lib")
		msg_result "$LOCAL_DIR/lib"
	else
		msg_result no
	fi
fi

msg_checking "whether we are cross compiling"
CROSS_COMPILING=0
if try_cc "int main(void) { return 0; }" "" ""; then
	if "$TMP_DIR/conftest" >/dev/null 2>&1; then
		msg_result no
	else
		CROSS_COMPILING=1
		msg_result yes
	fi
else
	CROSS_COMPILING=1
	msg_result yes
fi

EXEEXT=""
msg_checking "for executable suffix"
if [ -x "$TMP_DIR/conftest.exe" ]; then
	EXEEXT=.exe
fi
msg_result "${EXEEXT:-none}"

JOBS_HINT=$(getconf _NPROCESSORS_ONLN 2>/dev/null || true)
if [ -z "$JOBS_HINT" ] && command -v nproc >/dev/null 2>&1; then
	JOBS_HINT=$(nproc 2>/dev/null || true)
fi
case "$JOBS_HINT" in
''|*[!0-9]*) JOBS_HINT=1 ;;
esac

CONFIG_MK_TMP="$TMP_DIR/config.mk.$$"
: >"$CONFIG_MK_TMP"

TIMESTAMP=$(date -u '+%Y-%m-%dT%H:%M:%SZ')
printf '# Auto-generated by ./configure on %s\n' "$TIMESTAMP" >>"$CONFIG_MK_TMP"
printf 'CONF_CPPFLAGS :=\n' >>"$CONFIG_MK_TMP"
printf 'CONF_LDFLAGS :=\n' >>"$CONFIG_MK_TMP"
printf 'CONF_LIBS :=\n' >>"$CONFIG_MK_TMP"
printf 'CONFIGURE_TIMESTAMP := %s\n' "$TIMESTAMP" >>"$CONFIG_MK_TMP"
printf 'CONFIGURE_HOST := %s\n' "$(escape_make "$HOST")" >>"$CONFIG_MK_TMP"
printf 'CONFIGURE_BUILD := %s\n' "$(escape_make "$BUILD")" >>"$CONFIG_MK_TMP"
printf 'CONFIGURE_CC_MACHINE := %s\n' "$(escape_make "$CC_MACHINE")" >>"$CONFIG_MK_TMP"
printf 'CONFIGURE_LIBC := %s\n' "$(escape_make "$LIBC_KIND")" >>"$CONFIG_MK_TMP"
printf 'CROSS_COMPILING := %s\n' "$CROSS_COMPILING" >>"$CONFIG_MK_TMP"
printf 'EXEEXT := %s\n' "$(escape_make "$EXEEXT")" >>"$CONFIG_MK_TMP"

CONF_CPPFLAGS=""

msg_checking "for common system headers"
msg_result "(probing)"
for hdr in \
	stdlib.h stdio.h stdint.h inttypes.h stdbool.h stddef.h \
	string.h strings.h unistd.h errno.h fcntl.h signal.h \
	sys/types.h sys/stat.h sys/time.h sys/resource.h sys/wait.h \
	sys/select.h sys/ioctl.h sys/param.h sys/socket.h netdb.h \
	poll.h sys/poll.h termios.h stropts.h pthread.h \
	sys/event.h sys/timerfd.h sys/acl.h attr/xattr.h linux/xattr.h \
	dlfcn.h langinfo.h locale.h wchar.h wctype.h; do
	check_header "$hdr"
done

msg_checking "for common C library functions"
msg_result "(probing)"
check_func getcwd '#include <unistd.h>'
check_func realpath '#include <stdlib.h>'
check_func fchdir '#include <unistd.h>'
check_func fstatat '#include <sys/stat.h>'
check_func openat '#include <fcntl.h>'
check_func copy_file_range '#include <unistd.h>'
check_func memmove '#include <string.h>'
check_func strlcpy '#include <string.h>'
check_func strlcat '#include <string.h>'
check_func explicit_bzero '#include <string.h>'
check_func getline '#include <stdio.h>'
check_func getentropy '#include <unistd.h>'
check_func posix_spawn '#include <spawn.h>'
check_func clock_gettime '#include <time.h>'
check_func poll '#include <poll.h>'
check_func kqueue '#include <sys/event.h>'
check_func timerfd_create '#include <sys/timerfd.h>'
check_func pipe2 '#include <unistd.h>'
check_func closefrom '#include <unistd.h>'
check_func getrandom '#include <sys/random.h>'

msg_checking "for optional system libraries"
msg_result "(probing)"
CONF_LIBS=""
if check_lib_symbol crypt crypt; then
	CONF_LIBS="$CONF_LIBS -lcrypt"
	CRYPTO_LIBS='-lcrypt'
else
	CRYPTO_LIBS=''
	if [ "$FAIL_IF_MISSING" -eq 1 ]; then
		die "libcrypt not found and --enable-fail-if-missing was requested"
	fi
fi
if check_lib_symbol dl dlopen; then
	CONF_LIBS="$CONF_LIBS -ldl"
fi
if check_lib_symbol pthread pthread_create; then
	CONF_LIBS="$CONF_LIBS -lpthread"
fi
if check_lib_symbol rt clock_gettime; then
	CONF_LIBS="$CONF_LIBS -lrt"
fi
if check_lib_symbol util openpty; then
	CONF_LIBS="$CONF_LIBS -lutil"
fi
if check_lib_symbol attr setxattr; then
	CONF_LIBS="$CONF_LIBS -lattr"
fi
if check_lib_symbol selinux is_selinux_enabled; then
	CONF_LIBS="$CONF_LIBS -lselinux"
fi

EDITLINE_CPPFLAGS=""
EDITLINE_LIBS=""
msg_checking "for libedit via pkg-config"
if [ -n "$PKG_CONFIG" ] && "$PKG_CONFIG" --exists libedit >/dev/null 2>&1; then
	EDITLINE_CPPFLAGS=$($PKG_CONFIG --cflags libedit 2>/dev/null || true)
	EDITLINE_LIBS=$($PKG_CONFIG --libs libedit 2>/dev/null || true)
	msg_result yes
else
	msg_result no
fi
if [ -n "$EDITLINE_CPPFLAGS$EDITLINE_LIBS" ]; then
	msg_checking "whether libedit pkg-config flags are usable"
	if try_cc "int main(void) { return 0; }" "$EDITLINE_CPPFLAGS" "$EDITLINE_LIBS"; then
		msg_result yes
	else
		msg_result no
		EDITLINE_CPPFLAGS=""
		EDITLINE_LIBS=""
	fi
fi

printf 'CONF_CPPFLAGS += %s\n' "$(escape_make "$(normalize_ws "$CONF_CPPFLAGS")")" >>"$CONFIG_MK_TMP"
printf 'CONF_LDFLAGS +=\n' >>"$CONFIG_MK_TMP"
printf 'CONF_LIBS += %s\n' "$(escape_make "$(normalize_ws "$CONF_LIBS")")" >>"$CONFIG_MK_TMP"

mv "$CONFIG_MK_TMP" "$CONFIG_MK"

SUBDIR_LIST=$(
	for mk in ./*/GNUmakefile; do
		[ -f "$mk" ] || continue
		d=${mk#./}
		d=${d%/GNUmakefile}
		printf '%s\n' "$d"
	done | LC_ALL=C sort
)
[ -n "$SUBDIR_LIST" ] || die "no subdirectories with GNUmakefile found"
SUBDIRS_ONE_LINE=$(printf '%s\n' "$SUBDIR_LIST" | tr '\n' ' ' | sed 's/ $//')

CC_MAKE=$(escape_make "$CC_SELECTED")
AR_MAKE=$(escape_make "$AR")
RANLIB_MAKE=$(escape_make "$RANLIB")
NM_MAKE=$(escape_make "$NM")
AWK_MAKE=$(escape_make "$AWK")
SH_MAKE=$(escape_make "$SH")
CPPFLAGS_MAKE=$(escape_make "$CFG_CPPFLAGS")
CFLAGS_MAKE=$(escape_make "$CFG_CFLAGS")
LDFLAGS_MAKE=$(escape_make "$CFG_LDFLAGS")
CRYPTO_LIBS_MAKE=$(escape_make "$CRYPTO_LIBS")
EDITLINE_CPPFLAGS_MAKE=$(escape_make "$EDITLINE_CPPFLAGS")
EDITLINE_LIBS_MAKE=$(escape_make "$EDITLINE_LIBS")
PREFIX_MAKE=$(escape_make "$PREFIX")
BINDIR_MAKE=$(escape_make "$BINDIR")
SUBDIRS_MAKE=$(escape_make "$SUBDIRS_ONE_LINE")

GNUMAKEFILE_TMP="$TMP_DIR/GNUmakefile.$$"
cat >"$GNUMAKEFILE_TMP" <<'EOF_MK'
# Auto-generated by ./configure on @TIMESTAMP@.
# Regenerate with ./configure.

.DEFAULT_GOAL := all

-include $(CURDIR)/config.mk

CONFIGURE_HOST := @HOST@
CONFIGURE_BUILD := @BUILD@
CONFIGURE_CC_MACHINE := @CC_MACHINE@
CONFIGURE_LIBC := @LIBC@
CONFIGURE_MUSL := @IS_MUSL@
JOBS_HINT := @JOBS_HINT@

ifeq ($(origin CC), default)
CC := @CC@
endif
ifeq ($(origin CC), environment)
CC := @CC@
endif

AR ?= @AR@
ifeq ($(origin AR), default)
AR := @AR@
endif
ifeq ($(origin AR), environment)
AR := @AR@
endif

RANLIB ?= @RANLIB@
ifeq ($(origin RANLIB), default)
RANLIB := @RANLIB@
endif
ifeq ($(origin RANLIB), environment)
RANLIB := @RANLIB@
endif

NM ?= @NM@
AWK ?= @AWK@
SH ?= @SH@

CPPFLAGS += @CPPFLAGS@
CPPFLAGS += $(CONF_CPPFLAGS)
CFLAGS ?= @CFLAGS@
LDFLAGS += @LDFLAGS@
LDFLAGS += $(CONF_LDFLAGS)

CRYPTO_LIBS ?= @CRYPTO_LIBS@
EDITLINE_CPPFLAGS ?= @EDITLINE_CPPFLAGS@
EDITLINE_LIBS ?= @EDITLINE_LIBS@

PREFIX ?= @PREFIX@
BINDIR ?= @BINDIR@
DESTDIR ?=

MONO_BUILDDIR ?= $(CURDIR)/build
MONO_OUTDIR ?= $(CURDIR)/out
MONO_BINDIR := $(MONO_OUTDIR)/bin

SUBDIRS := @SUBDIRS@
SUBDIR_ALIASES := $(filter-out test,$(SUBDIRS))

SUBMAKE_OVERRIDES = \
	CC="$(CC)" \
	AR="$(AR)" \
	AWK="$(AWK)" \
	RANLIB="$(RANLIB)" \
	NM="$(NM)" \
	SH="$(SH)" \
	CRYPTO_LIBS="$(CRYPTO_LIBS)" \
	EDITLINE_CPPFLAGS="$(EDITLINE_CPPFLAGS)" \
	EDITLINE_LIBS="$(EDITLINE_LIBS)" \
	PREFIX="$(PREFIX)" \
	BINDIR="$(BINDIR)" \
	DESTDIR="$(DESTDIR)" \
	CROSS_COMPILING="$(CROSS_COMPILING)" \
	EXEEXT="$(EXEEXT)"

.PHONY: all clean clean-% distclean maintainer-clean rebuild reconfigure \
	check check-% test status stage install list print-config print-subdirs \
	help prepare prepare-% unprepare

all: $(addprefix build-,$(SUBDIRS))

$(SUBDIR_ALIASES): %: build-%

prepare: $(addprefix prepare-,$(SUBDIRS))

prepare-%:
	@mkdir -p "$(MONO_BUILDDIR)/$*" "$(MONO_OUTDIR)"
	@if [ -e "$*/build" ] && [ ! -L "$*/build" ]; then rm -rf "$*/build"; fi
	@ln -sfn "../build/$*" "$*/build"
	@if [ -e "$*/out" ] && [ ! -L "$*/out" ]; then rm -rf "$*/out"; fi
	@ln -sfn "../out" "$*/out"

unprepare:
	@set -e; \
	for d in $(SUBDIRS); do \
		if [ -L "$$d/build" ]; then rm -f "$$d/build"; fi; \
		if [ -L "$$d/out" ]; then rm -f "$$d/out"; fi; \
	done

build-%: prepare-%
	+env CPPFLAGS="$(CPPFLAGS)" CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \
		$(MAKE) -C "$*" -f GNUmakefile $(SUBMAKE_OVERRIDES) all

clean: $(addprefix clean-,$(SUBDIRS))
	@rm -rf "$(MONO_BUILDDIR)" "$(MONO_OUTDIR)"

distclean: clean unprepare
	@rm -f "$(CURDIR)/config.mk" "$(CURDIR)/GNUmakefile" "$(CURDIR)/GNUMakeFile"

maintainer-clean: distclean

rebuild: clean all

reconfigure:
	@$(SH) "$(CURDIR)/configure"

clean-%:
	+env CPPFLAGS="$(CPPFLAGS)" CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \
		$(MAKE) -C "$*" -f GNUmakefile $(SUBMAKE_OVERRIDES) clean

check: $(addprefix check-,$(SUBDIRS))

check-%: prepare-%
	+env CPPFLAGS="$(CPPFLAGS)" CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \
		$(MAKE) -C "$*" -f GNUmakefile $(SUBMAKE_OVERRIDES) test

test: check

status:
	@printf 'build root: %s\n' "$(MONO_BUILDDIR)"
	@printf 'out root: %s\n' "$(MONO_OUTDIR)"
	@ls -1 "$(MONO_OUTDIR)" 2>/dev/null || true

stage: all
	@mkdir -p "$(MONO_BINDIR)"
	@set -e; \
	for f in "$(MONO_OUTDIR)"/*; do \
		[ -f "$$f" ] || continue; \
		[ -x "$$f" ] || continue; \
		case "$$f" in \
			*.a|*.o|*.lo) continue ;; \
		esac; \
		cp -f "$$f" "$(MONO_BINDIR)/"; \
	done

install: stage
	@mkdir -p "$(DESTDIR)$(BINDIR)"
	@set -e; \
	for f in "$(MONO_BINDIR)"/*; do \
		[ -f "$$f" ] || continue; \
		[ -x "$$f" ] || continue; \
		cp -f "$$f" "$(DESTDIR)$(BINDIR)/"; \
	done

list:
	@printf '%s\n' $(SUBDIRS)

print-subdirs:
	@printf '%s\n' $(SUBDIRS)

print-config:
	@printf 'CC=%s\n' "$(CC)"
	@printf 'AR=%s\n' "$(AR)"
	@printf 'RANLIB=%s\n' "$(RANLIB)"
	@printf 'NM=%s\n' "$(NM)"
	@printf 'CPPFLAGS=%s\n' "$(CPPFLAGS)"
	@printf 'CFLAGS=%s\n' "$(CFLAGS)"
	@printf 'LDFLAGS=%s\n' "$(LDFLAGS)"
	@printf 'LDLIBS=%s\n' "$(CONF_LIBS)"
	@printf 'MONO_BUILDDIR=%s\n' "$(MONO_BUILDDIR)"
	@printf 'MONO_OUTDIR=%s\n' "$(MONO_OUTDIR)"
	@printf 'CONFIGURE_LIBC=%s\n' "$(CONFIGURE_LIBC)"
	@printf 'CONFIGURE_CC_MACHINE=%s\n' "$(CONFIGURE_CC_MACHINE)"

help:
	@printf '%s\n' 'Targets:'
	@printf '%s\n' '  all prepare clean distclean maintainer-clean rebuild reconfigure'
	@printf '%s\n' '  check test status stage install list print-subdirs print-config help'
	@printf '%s\n' 'Suggested: make -f GNUmakefile -j$(JOBS_HINT) all'
EOF_MK

sed \
	-e "s|@TIMESTAMP@|$(escape_sed "$TIMESTAMP")|g" \
	-e "s|@HOST@|$(escape_sed "$HOST")|g" \
	-e "s|@BUILD@|$(escape_sed "$BUILD")|g" \
	-e "s|@CC_MACHINE@|$(escape_sed "$CC_MACHINE")|g" \
	-e "s|@LIBC@|$(escape_sed "$LIBC_KIND")|g" \
	-e "s|@IS_MUSL@|$(escape_sed "$IS_MUSL")|g" \
	-e "s|@JOBS_HINT@|$(escape_sed "$JOBS_HINT")|g" \
	-e "s|@CC@|$(escape_sed "$CC_MAKE")|g" \
	-e "s|@AR@|$(escape_sed "$AR_MAKE")|g" \
	-e "s|@RANLIB@|$(escape_sed "$RANLIB_MAKE")|g" \
	-e "s|@NM@|$(escape_sed "$NM_MAKE")|g" \
	-e "s|@AWK@|$(escape_sed "$AWK_MAKE")|g" \
	-e "s|@SH@|$(escape_sed "$SH_MAKE")|g" \
	-e "s|@CPPFLAGS@|$(escape_sed "$CPPFLAGS_MAKE")|g" \
	-e "s|@CFLAGS@|$(escape_sed "$CFLAGS_MAKE")|g" \
	-e "s|@LDFLAGS@|$(escape_sed "$LDFLAGS_MAKE")|g" \
	-e "s|@CRYPTO_LIBS@|$(escape_sed "$CRYPTO_LIBS_MAKE")|g" \
	-e "s|@EDITLINE_CPPFLAGS@|$(escape_sed "$EDITLINE_CPPFLAGS_MAKE")|g" \
	-e "s|@EDITLINE_LIBS@|$(escape_sed "$EDITLINE_LIBS_MAKE")|g" \
	-e "s|@PREFIX@|$(escape_sed "$PREFIX_MAKE")|g" \
	-e "s|@BINDIR@|$(escape_sed "$BINDIR_MAKE")|g" \
	-e "s|@SUBDIRS@|$(escape_sed "$SUBDIRS_MAKE")|g" \
	"$GNUMAKEFILE_TMP" >"$GNUMAKEFILE"
rm -f "$GNUMAKEFILE_TMP"
rm -f "$SELF_DIR/GNUMakeFile"

cat >>"$LOG_FILE" <<EOF_LOG
--- configure summary ---
configure timestamp: $TIMESTAMP
host: $HOST
build: $BUILD
compiler: $CC_SELECTED
compiler machine: $CC_MACHINE
libc: $LIBC_KIND
is musl: $IS_MUSL
ar: $AR
ranlib: $RANLIB
nm: $NM
awk: $AWK
sh: $SH
make: $MAKE
pkg-config: ${PKG_CONFIG:-none}
cppflags: ${CFG_CPPFLAGS:-<none>}
cflags: ${CFG_CFLAGS:-<none>}
ldflags: ${CFG_LDFLAGS:-<none>}
conf_cppflags: ${CONF_CPPFLAGS:-<none>}
conf_libs: ${CONF_LIBS:-<none>}
crypto libs: ${CRYPTO_LIBS:-<none>}
editline cppflags: ${EDITLINE_CPPFLAGS:-<none>}
editline libs: ${EDITLINE_LIBS:-<none>}
prefix: $PREFIX
bindir: $BINDIR
cross compiling: $CROSS_COMPILING
subdirs: $SUBDIRS_ONE_LINE
EOF_LOG

msg_result ""
printf 'configure: created %s\n' "$GNUMAKEFILE"
printf 'configure: created %s\n' "$CONFIG_MK"
printf 'configure: libc=%s compiler=%s subdirs=%s\n' "$LIBC_KIND" "$CC_SELECTED" "$(printf '%s\n' "$SUBDIR_LIST" | wc -l | tr -d ' ')"
printf 'configure: run %s\n' "make -f GNUmakefile -j$JOBS_HINT all"