prereq: Use check-lxdialog.sh to determine curses library

Curses detection in adk/config/Makefile is a mess - pkg-config was
designed to avoid exactly that, so make it a required tool on all host
OSs and call check-lxdialog.sh from mconf sources which uses it to
define the required curses LIBS and CFLAGS from prereq.sh.

Since pkg-config output also contains the right arguments for libtinfo
(which depends on the chosen curses variant), no mismatches between the
two may happen anymore.

While being at it, sync check-lxdialog.sh with current linux sources so
it covers installations with widechar support as well.

Signed-off-by: Phil Sutter <phil@nwl.cc>

adk/config/Makefile

@@ -8,58 +8,11 @@ include ${ADK_TOPDIR}/rules.mk
 endif
 
 CP=cp -fpR
-HOST_CFLAGS+=-DKBUILD_NO_NLS -w
+HOST_CFLAGS+=	-DKBUILD_NO_NLS -w ${CURSES_CFLAGS}
+LIBS=		${CURSES_LIBS}
 
 all: ncurses conf mconf
 
-LIBS=
-ifeq (/usr/lib/libtinfo.so, $(wildcard /usr/lib/libtinfo.so))
-LIBS=		-ltinfo
-endif
-
-ifeq (/usr/include/ncursesw/curses.h, $(wildcard /usr/include/ncursesw/curses.h))
-HOST_CFLAGS+=	-I/usr/include/ncursesw -DCURSES_LOC="<curses.h>"
-LIBS+=		-lncursesw
-else
-ifeq (/usr/include/ncurses/ncurses.h, $(wildcard /usr/include/ncurses/ncurses.h))
-HOST_CFLAGS+=	-I/usr/include/ncurses -DCURSES_LOC="<ncurses.h>"
-LIBS+=		-lncurses
-else
-ifeq (/usr/include/ncurses/curses.h, $(wildcard /usr/include/ncurses/curses.h))
-HOST_CFLAGS+=	-I/usr/include/ncurses -DCURSES_LOC="<ncurses/curses.h>"
-LIBS+=		-lncurses
-else
-ifeq (/usr/include/ncurses.h, $(wildcard /usr/include/ncurses.h))
-HOST_CFLAGS+=	-DCURSES_LOC="<ncurses.h>"
-LIBS+=		-lncurses
-else
-ifeq (/usr/local/include/ncurses/ncurses.h, $(wildcard /usr/local/include/ncurses/ncurses.h))
-HOST_CFLAGS+=	-I/usr/local/include/ncurses -DCURSES_LOC="<ncurses.h>"
-LIBS+=		-lncurses
-else
-ifeq (/usr/local/include/ncurses/curses.h, $(wildcard /usr/local/include/ncurses/curses.h))
-HOST_CFLAGS+=	-I/usr/local/include/ncurses -DCURSES_LOC="<ncurses/curses.h>"
-LIBS+=		-lncurses
-else
-ifeq (/usr/local/opt/ncurses/include/ncursesw/ncurses.h, $(wildcard /usr/local/opt/ncurses/include/ncursesw/ncurses.h))
-HOST_CFLAGS+=	-I/usr/local/opt/ncurses/include -DCURSES_LOC="<ncursesw/ncurses.h>"
-LIBS+=		-L/usr/local/opt/ncurses/lib -Wl,-rpath -Wl,/usr/local/opt/ncurses/lib -lncursesw
-else
-ifeq (/usr/pkg/include/ncurses.h, $(wildcard /usr/pkg/include/ncurses.h))
-HOST_CFLAGS+=	-I/usr/pkg/include -DCURSES_LOC="<ncurses.h>"
-LIBS+=		-L/usr/pkg/lib -Wl,-rpath -Wl,/usr/pkg/lib -lncurses
-else
-HOST_CFLAGS+=	-DCURSES_LOC="<curses.h>"
-LIBS=		-lcurses
-endif
-endif
-endif
-endif
-endif
-endif
-endif
-endif
-
 CONF_SRC  =conf.c
 MCONF_SRC =mconf.c $(wildcard lxdialog/*.c)
 SHARED_SRC=zconf.tab.c

adk/config/lxdialog/check-lxdialog.sh

@@ -4,7 +4,9 @@
 # What library to link
 ldflags()
 {
-	for ext in so a dylib ; do
+	pkg-config --libs ncursesw 2>/dev/null && exit
+	pkg-config --libs ncurses 2>/dev/null && exit
+	for ext in so a dll.a dylib ; do
 		for lib in ncursesw ncurses curses ; do
 			$cc -print-file-name=lib${lib}.${ext} | grep -q /
 			if [ $? -eq 0 ]; then
@@ -19,10 +21,17 @@ ldflags()
 # Where is ncurses.h?
 ccflags()
 {
-	if [ -f /usr/include/ncurses/ncurses.h ]; then
+	if pkg-config --cflags ncursesw 2>/dev/null; then
+		echo '-DCURSES_LOC="<ncurses.h>" -DNCURSES_WIDECHAR=1'
+	elif pkg-config --cflags ncurses 2>/dev/null; then
+		echo '-DCURSES_LOC="<ncurses.h>"'
+	elif [ -f /usr/include/ncursesw/curses.h ]; then
+		echo '-I/usr/include/ncursesw -DCURSES_LOC="<curses.h>"'
+		echo ' -DNCURSES_WIDECHAR=1'
+	elif [ -f /usr/include/ncurses/ncurses.h ]; then
 		echo '-I/usr/include/ncurses -DCURSES_LOC="<ncurses.h>"'
 	elif [ -f /usr/include/ncurses/curses.h ]; then
-		echo '-I/usr/include/ncurses -DCURSES_LOC="<ncurses/curses.h>"'
+		echo '-I/usr/include/ncurses -DCURSES_LOC="<curses.h>"'
 	elif [ -f /usr/include/ncurses.h ]; then
 		echo '-DCURSES_LOC="<ncurses.h>"'
 	else
@@ -36,7 +45,7 @@ trap "rm -f $tmp" 0 1 2 3 15
 
 # Check if we can link to ncurses
 check() {
-        $cc -xc - -o $tmp 2>/dev/null <<'EOF'
+        $cc -x c - -o $tmp 2>/dev/null <<'EOF'
 #include CURSES_LOC
 main() {}
 EOF

scripts/prereq.sh

@@ -304,6 +304,24 @@ if ! which git >/dev/null 2>&1; then
 fi
 printf "found\n"
 
+printf " --->  checking if pkg-config is installed.. "
+if ! which pkg-config >/dev/null 2>&1; then
+  printf "not found\n"
+  out=1
+else
+  printf "found\n"
+fi
+
+printf " --->  checking if ncurses is installed.. "
+check_lxdialog=${topdir}/adk/config/lxdialog/check-lxdialog.sh
+CURSES_CFLAGS=$(/bin/sh ${check_lxdialog} -ccflags | tr '\n' ' ')
+CURSES_LIBS=$(/bin/sh ${check_lxdialog} -ldflags ${CC})
+if [ $? -eq 0 ]; then
+	printf "found\n"
+else
+	printf "not found\n"
+	out=1
+fi
 
 # creating prereq.mk
 echo "ADK_TOPDIR:=$(readlink -nf . 2>/dev/null || pwd -P)" > $topdir/prereq.mk
@@ -327,6 +345,8 @@ echo "ARCH_FOR_BUILD:=$(${CC} -dumpmachine | sed \
     -e 's/mipsel-.*/mipsel/' \
     -e 's/i[3-9]86/x86/' \
     )" >>prereq.mk
+echo "CURSES_LIBS:=${CURSES_LIBS}" >> $topdir/prereq.mk
+echo "CURSES_CFLAGS:=${CURSES_CFLAGS}" >> $topdir/prereq.mk
 
 if [ "$CC" = "clang" ]; then
   echo "HOST_CC:=${CC} -fbracket-depth=1024" >> $topdir/prereq.mk
@@ -423,17 +443,6 @@ fi
 rm test.c test 2>/dev/null
 rm Makefile.tmp 2>/dev/null
 
-# for make kernelconfig pkg-config is required to find ncurses
-if [ $os = "Darwin" ]; then
-  printf " --->  checking if pkg-config is installed.. "
-  if ! which pkg-config >/dev/null 2>&1; then
-    printf "not found\n"
-    out=1
-  else
-    printf "found\n"
-  fi
-fi
-
 # error out on any required prerequisite
 if [ $out -ne 0 ]; then
   exit