New (and again revised =) slang test code (Albert Chin-A-Young)

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@178 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -14,8 +14,7 @@ CVS code
 	- Patch to handle $DESTDIR (orig by Dan Harnett contributed by
 	  Christian Weisgerber)
 - configure.in:
-	- New slang test code (Albert Chin-A-Young)
-	- Test for libm if --with-slang called.
+	- New (and again revised =) slang test code (Albert Chin-A-Young)
 
 nano-0.9.15 - 08/03/2000
 - Changed edit_update call to take arguments TOP, CENTER or BOTTOM.

config.h.in

@@ -172,9 +172,6 @@
 /* Define if you have the i library (-li).  */
 #undef HAVE_LIBI
 
-/* Define if you have the m library (-lm).  */
-#undef HAVE_LIBM
-
 /* Name of package */
 #undef PACKAGE
 

configure.in

-dnl $Id$
+# $Id$
 dnl Process this file with autoconf to produce a configure script.
 AC_INIT(nano.c)
 AM_INIT_AUTOMAKE(nano, 0.9.15-cvs)
@@ -38,18 +38,12 @@ AC_ARG_WITH(slang,
 	    CPPFLAGS="-I$with_slang/include $CPPFLAGS"
 	fi
 
-	AC_CHECK_LIB(m, sin)
-	if test "$ac_cv_lib_m_sin" != "yes"
-	then
-	    AC_MSG_WARN([
-*** The libm library was not found.  Some BSD systems require libm
-*** in order for slang to work.  If nano fails to build, consider
-*** obtaining libm or running configure without the --with-slang option
-])
-	fi
-
 	AC_CHECK_HEADER(slcurses.h,
-	    AC_CHECK_LIB(slang, SLcurses_newwin, [
+	    AC_MSG_CHECKING(for SLtt_initialize in -lslang)
+	    _libs=$LIBS
+	    LIBS="$LIBS -lslang"
+	    AC_TRY_RUN([int main () { SLtt_initialize (); return 0; }],
+		[AC_MSG_RESULT(yes)
 		AC_DEFINE(USE_SLANG)
 		slang_support=yes
 		if test "$with_slang" != "yes"; then
@@ -58,17 +52,17 @@ AC_ARG_WITH(slang,
 		    CURSES_LIB="-lslang"
 		fi
 		CURSES_LIB_NAME=slang], [
-	    # OpenBSD needs termcap library
+		AC_MSG_RESULT(no)
+		# We might need the term library
 		for termlib in ncurses curses termcap terminfo termlib; do
-		AC_CHECK_LIB(${termlib}, tputs, [tcap="$tcap -l$termlib"])
-		[case "$tcap" in
-		    *-l${termlib}*)
-			break
-		    ;;
-		esac]
+		    AC_CHECK_LIB(${termlib}, tputs, [tcap="-l$termlib"])
+		    test -n "$tcap" && break
 		done
 
-	    AC_CHECK_LIB(slang, SLcurses_initscr, [
+		AC_MSG_CHECKING(for SLtt_initialize in -lslang $tcap)
+		LIBS="$LIBS $tcap"
+		AC_TRY_RUN([int main () { SLtt_initialize (); return 0; }],
+		    [AC_MSG_RESULT(yes)
 		    AC_DEFINE(USE_SLANG)
 		    slang_support=yes
 		    if test "$with_slang" != "yes"; then
@@ -76,7 +70,22 @@ AC_ARG_WITH(slang,
 		    else
 			CURSES_LIB="-lslang $tcap"
 		    fi
-		CURSES_LIB_NAME=slang], , $tcap)]),
+		    CURSES_LIB_NAME=slang], [
+		    AC_MSG_RESULT(no)
+		    # We might need the math library
+		    AC_MSG_CHECKING(for SLtt_initialize in -lslang $tcap -lm)
+		    LIBS="$LIBS -lm"
+		    AC_TRY_RUN([int main () { SLtt_initialize (); return 0; }],
+			[AC_MSG_RESULT(yes)
+			AC_DEFINE(USE_SLANG)
+			slang_support=yes
+			if test "$with_slang" != "yes"; then
+			    CURSES_LIB="-L${with_slang}/lib -lslang $tcap -lm"
+			else
+			    CURSES_LIB="-lslang $tcap -lm"
+			fi
+			CURSES_LIB_NAME=slang],
+			[AC_MSG_RESULT(no)])])]),
 	    AC_MSG_ERROR([
 *** The header file slcurses.h was not found. If you wish to use
 *** slang support this header file is required. Please either
@@ -84,6 +93,8 @@ AC_ARG_WITH(slang,
 *** do not call the configure script with --with-slang
 ]))
 
+	test "${_libs+set}" = "set" && LIBS=$_libs
+
 	if test "$with_slang" != "yes"; then
 	    LDFLAGS=${_ldflags}
 	fi
@@ -160,7 +171,6 @@ then
 	LDFLAGS="$LDFLAGS $glib_libs"
 fi
 
-
 dnl i18n stuff - pretty incomplete for now
 AM_GNU_GETTEXT