- Issue #21285: Refactor and fix curses configure check to always search

  in a ncursesw directory.

Misc/NEWS

@@ -174,6 +174,9 @@ IDLE
 Build
 -----
 
+- Issue #21285: Refactor and fix curses configure check to always search
+  in a ncursesw directory.
+
 - Issue #15234: For BerkelyDB and Sqlite, only add the found library and
   include directories if they aren't already being searched. This avoids
   an explicit runtime library dependency.

configure

@@ -6969,11 +6969,9 @@ $as_echo "#define STDC_HEADERS 1" >>confdefs.h
 
 fi
 
-ac_save_cppflags="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
-for ac_header in asm/types.h conio.h curses.h direct.h dlfcn.h errno.h \
+for ac_header in asm/types.h conio.h direct.h dlfcn.h errno.h \
 fcntl.h grp.h \
-ieeefp.h io.h langinfo.h libintl.h ncurses.h process.h pthread.h \
+ieeefp.h io.h langinfo.h libintl.h process.h pthread.h \
 sched.h shadow.h signal.h stdint.h stropts.h termios.h \
 unistd.h utime.h \
 poll.h sys/devpoll.h sys/epoll.h sys/poll.h \
@@ -6997,7 +6995,6 @@ fi
 
 done
 
-CPPFLAGS=$ac_save_cppflags
 ac_header_dirent=no
 for ac_hdr in dirent.h sys/ndir.h sys/dir.h ndir.h; do
   as_ac_Header=`$as_echo "ac_cv_header_dirent_$ac_hdr" | $as_tr_sh`
@@ -7234,26 +7231,6 @@ fi
 done
 
 
-
-# On Solaris, term.h requires curses.h
-for ac_header in term.h
-do :
-  ac_fn_c_check_header_compile "$LINENO" "term.h" "ac_cv_header_term_h" "
-#ifdef HAVE_CURSES_H
-#include <curses.h>
-#endif
-
-"
-if test "x$ac_cv_header_term_h" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_TERM_H 1
-_ACEOF
-
-fi
-
-done
-
-
 # On Linux, netlink.h requires asm/types.h
 for ac_header in linux/netlink.h
 do :
@@ -14677,8 +14654,43 @@ $as_echo "#define HAVE_STAT_TV_NSEC2 1" >>confdefs.h
 
 fi
 
+# first curses header check
 ac_save_cppflags="$CPPFLAGS"
 CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
+
+for ac_header in curses.h ncurses.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" "$ac_includes_default"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
+# On Solaris, term.h requires curses.h
+for ac_header in term.h
+do :
+  ac_fn_c_check_header_compile "$LINENO" "term.h" "ac_cv_header_term_h" "
+#ifdef HAVE_CURSES_H
+#include <curses.h>
+#endif
+
+"
+if test "x$ac_cv_header_term_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_TERM_H 1
+_ACEOF
+
+fi
+
+done
+
+
 # On HP/UX 11.0, mvwdelch is a block with a return statement
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether mvwdelch is an expression" >&5
 $as_echo_n "checking whether mvwdelch is an expression... " >&6; }

configure.ac

@@ -1546,11 +1546,9 @@ dnl AC_MSG_RESULT($cpp_type)
 
 # checks for header files
 AC_HEADER_STDC
-ac_save_cppflags="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
-AC_CHECK_HEADERS(asm/types.h conio.h curses.h direct.h dlfcn.h errno.h \
+AC_CHECK_HEADERS(asm/types.h conio.h direct.h dlfcn.h errno.h \
 fcntl.h grp.h \
-ieeefp.h io.h langinfo.h libintl.h ncurses.h process.h pthread.h \
+ieeefp.h io.h langinfo.h libintl.h process.h pthread.h \
 sched.h shadow.h signal.h stdint.h stropts.h termios.h \
 unistd.h utime.h \
 poll.h sys/devpoll.h sys/epoll.h sys/poll.h \
@@ -1562,7 +1560,6 @@ sys/times.h sys/types.h sys/uio.h sys/un.h sys/utsname.h sys/wait.h pty.h \
 libutil.h sys/resource.h netpacket/packet.h sysexits.h bluetooth.h \
 bluetooth/bluetooth.h linux/tipc.h spawn.h util.h alloca.h endian.h \
 sys/endian.h)
-CPPFLAGS=$ac_save_cppflags
 AC_HEADER_DIRENT
 AC_HEADER_MAJOR
 
@@ -1582,14 +1579,6 @@ AC_CHECK_HEADERS([net/if.h], [], [],
 #endif
 ])
 
-
-# On Solaris, term.h requires curses.h
-AC_CHECK_HEADERS(term.h,,,[
-#ifdef HAVE_CURSES_H
-#include <curses.h>
-#endif
-])
-
 # On Linux, netlink.h requires asm/types.h
 AC_CHECK_HEADERS(linux/netlink.h,,,[
 #ifdef HAVE_ASM_TYPES_H
@@ -4391,8 +4380,19 @@ then
   [Define if you have struct stat.st_mtimensec])
 fi
 
+# first curses header check
 ac_save_cppflags="$CPPFLAGS"
 CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
+
+AC_CHECK_HEADERS(curses.h ncurses.h)
+
+# On Solaris, term.h requires curses.h
+AC_CHECK_HEADERS(term.h,,,[
+#ifdef HAVE_CURSES_H
+#include <curses.h>
+#endif
+])
+
 # On HP/UX 11.0, mvwdelch is a block with a return statement
 AC_MSG_CHECKING(whether mvwdelch is an expression)
 AC_CACHE_VAL(ac_cv_mvwdelch_is_expression,