Allow linking GDB with ncursesw

Triggered by https://launchpad.net/bugs/1275210, to be able to cope
with UTF-8 characters in gdbtui.

Reference:
  https://sourceware.org/ml/gdb-patches/2017-09/msg00356.html

gdb/ChangeLog:
2017-09-26  Matthias Klose  <doko@ubuntu.com>

	* configure.ac: Search ncursesw before ncurses.
	Check ncursesw/ncurses.h before ncurses/ncurses.h.
	* gdb_curses.h: Include <ncursesw/ncurses.h>
	* config.in, configure: Regenerate.

5 files changed, 19 insertions, 7 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2c825ef..68f4817 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2017-09-26  Matthias Klose  <doko@ubuntu.com>
+
+	* configure.ac: Search ncursesw before ncurses.
+	Check ncursesw/ncurses.h before ncurses/ncurses.h.
+	* gdb_curses.h: Include <ncursesw/ncurses.h>
+	* config.in, configure: Regenerate.
+
 2017-09-26  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	PR gdb/22185
diff --git a/gdb/config.in b/gdb/config.in
index 9fa90af..3f8ee38 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -294,6 +294,9 @@
 /* Define to 1 if you have the `monstartup' function. */
 #undef HAVE_MONSTARTUP
 
+/* Define to 1 if you have the <ncursesw/ncurses.h> header file. */
+#undef HAVE_NCURSESW_NCURSES_H
+
 /* Define to 1 if you have the <ncurses.h> header file. */
 #undef HAVE_NCURSES_H
 
diff --git a/gdb/configure b/gdb/configure
index e4bde75..303c7ba 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -8746,7 +8746,7 @@ return waddstr ();
   return 0;
 }
 _ACEOF
-for ac_lib in '' ncurses cursesX curses; do
+for ac_lib in '' ncursesw ncurses cursesX curses; do
   if test -z "$ac_lib"; then
     ac_res="none required"
   else
@@ -8844,7 +8844,7 @@ return tgetent ();
   return 0;
 }
 _ACEOF
-for ac_lib in '' termcap tinfo curses ncurses; do
+for ac_lib in '' termcap tinfo curses ncursesw ncurses; do
   if test -z "$ac_lib"; then
     ac_res="none required"
   else
@@ -11595,7 +11595,7 @@ fi
 done
 
 
-for ac_header in curses.h cursesX.h ncurses.h ncurses/ncurses.h ncurses/term.h
+for ac_header in curses.h cursesX.h ncurses.h ncursesw/ncurses.h ncurses/ncurses.h ncurses/term.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
diff --git a/gdb/configure.ac b/gdb/configure.ac
index 2e4ccb6..9dc4c77 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -562,7 +562,7 @@ if test x"$prefer_curses" = xyes; then
   # search /usr/local/include, if ncurses is installed in /usr/local.  A
   # default installation of ncurses on alpha*-dec-osf* will lead to such
   # a situation.
-  AC_SEARCH_LIBS(waddstr, [ncurses cursesX curses])
+  AC_SEARCH_LIBS(waddstr, [ncursesw ncurses cursesX curses])
 
   if test "$ac_cv_search_waddstr" != no; then
     curses_found=yes
@@ -604,7 +604,7 @@ case $host_os in
 esac
 
 # These are the libraries checked by Readline.
-AC_SEARCH_LIBS(tgetent, [termcap tinfo curses ncurses])
+AC_SEARCH_LIBS(tgetent, [termcap tinfo curses ncursesw ncurses])
 
 if test "$ac_cv_search_tgetent" = no; then
   CONFIG_OBS="$CONFIG_OBS stub-termcap.o"
@@ -1301,7 +1301,7 @@ AC_CHECK_HEADERS(sys/user.h, [], [],
 #endif
 ])
 
-AC_CHECK_HEADERS(curses.h cursesX.h ncurses.h ncurses/ncurses.h ncurses/term.h)
+AC_CHECK_HEADERS(curses.h cursesX.h ncurses.h ncursesw/ncurses.h ncurses/ncurses.h ncurses/term.h)
 AC_CHECK_HEADERS(term.h, [], [],
 [#if HAVE_CURSES_H
 # include <curses.h>
diff --git a/gdb/gdb_curses.h b/gdb/gdb_curses.h
index 72fafe3..4f9ed11 100644
--- a/gdb/gdb_curses.h
+++ b/gdb/gdb_curses.h
@@ -39,7 +39,9 @@
 #define NOMACROS
 #define NCURSES_NOMACROS
 
-#if defined (HAVE_NCURSES_NCURSES_H)
+#if defined (HAVE_NCURSESW_NCURSES_H)
+#include <ncursesw/ncurses.h>
+#elif defined (HAVE_NCURSES_NCURSES_H)
 #include <ncurses/ncurses.h>
 #elif defined (HAVE_NCURSES_H)
 #include <ncurses.h>