From 4ddb9ccbf3223c0393bfc61781a322a45a21aa34 Mon Sep 17 00:00:00 2001
From: Explorer09 <explorer09@gmail.com>
Date: Mon, 28 Oct 2024 19:25:07 +0800
Subject: [PATCH] build: Add a test for whether curses.h works.

The main thing I intended to test is "stdscr", but it is also useful to
test ncurses functions that might be implemented as macros, such as
refresh() and mvadd_wchnstr().

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
---
 ProvideCurses.h |  4 ++++
 configure.ac    | 26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/ProvideCurses.h b/ProvideCurses.h
index 7ae99e620..4594e3baf 100644
--- a/ProvideCurses.h
+++ b/ProvideCurses.h
@@ -8,7 +8,11 @@ in the source distribution for its full text.
 */
 
 
+// This header is also used in tests by configure, thus conditionally
+// including "config.h".
+#if defined(HAVE_CONFIG_H)
 #include "config.h" // IWYU pragma: keep
+#endif
 
 // IWYU pragma: begin_exports
 
diff --git a/configure.ac b/configure.ac
index 9c8b1d1b7..6a7926dee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -666,6 +666,7 @@ esac
 
 htop_save_CFLAGS=$CFLAGS
 CFLAGS="$AM_CFLAGS $CFLAGS"
+
 if test "x$enable_unicode" = xyes; then
    AC_CHECK_HEADERS([ncursesw/curses.h], [],
       [AC_CHECK_HEADERS([ncurses/ncurses.h], [],
@@ -688,6 +689,31 @@ else
       [AC_CHECK_HEADERS([term.h], [],
          [AC_MSG_ERROR([can not find required term header file])])])
 fi
+
+CFLAGS="-I$srcdir $CFLAGS"
+
+# Check for things that might be macros.
+# "stdscr" is a macro in ncursest (reentrant version of ncurses).
+AC_MSG_CHECKING([whether the curses header works])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include "ProvideCurses.h"
+   ]], [[
+keypad(stdscr, 0);
+
+refresh();
+
+#if defined(HAVE_LIBNCURSESW)
+{
+   static cchar_t dummy;
+   mvadd_wchnstr(0, 0, &dummy, 0);
+}
+#endif
+   ]])],
+   [AC_MSG_RESULT(yes)],
+   [AC_MSG_RESULT(no)
+   AC_MSG_FAILURE([there are problems with the curses header])]
+)
+
 CFLAGS=$htop_save_CFLAGS
 
 if test "$enable_static" = yes; then