./configure checks now if modtcl can be built or not.

Many people had errors about couldn't find tcl.h if tcl isn't installed.

git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@2188 726aef4b-f618-498e-8847-2d620e286838

aclocal.m4

@@ -148,7 +148,7 @@ $$1_PKG_ERRORS
 Consider adjusting the PKG_CONFIG_PATH environment variable if you
 installed software in a non-standard prefix.
 
-_PKG_TEXT])[]dnl
+_PKG_TEXT])dnl
         ])
 elif test $pkg_failed = untried; then
      	AC_MSG_RESULT([no])
@@ -159,7 +159,7 @@ path to pkg-config.
 
 _PKG_TEXT
 
-To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])dnl
         ])
 else
 	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS

configure

@@ -3961,6 +3961,19 @@ $as_echo_n "checking modtcl flags... " >&6; }
 		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $TCL_FLAGS" >&5
 $as_echo "$TCL_FLAGS" >&6; }
 	fi
+	my_saved_LDFLAGS="$LDFLAGS"
+	appendLD "$TCL_FLAGS"
+	ac_fn_cxx_check_func "$LINENO" "Tcl_CreateInterp" "ac_cv_func_Tcl_CreateInterp"
+if test "x$ac_cv_func_Tcl_CreateInterp" = x""yes; then :
+  TCL_TEST=yes
+else
+  TCL_TEST=no
+fi
+
+	if test x"$TCL_TEST" = "xno"; then
+		as_fn_error $? "tcl not found, try --disable-tcl, or install tcl properly." "$LINENO" 5
+	fi
+	LDFLAGS="$my_saved_LDFLAGS"
 fi
 
 if test x"$EXTRA" = "xyes"

configure.in

@@ -361,6 +361,13 @@ then
 		TCL_FLAGS="$TCL_INCLUDE_SPEC $TCL_LIB_SPEC"
 		AC_MSG_RESULT([$TCL_FLAGS])
 	fi
+	my_saved_LDFLAGS="$LDFLAGS"
+	appendLD "$TCL_FLAGS"
+	AC_CHECK_FUNC([Tcl_CreateInterp], [TCL_TEST=yes], [TCL_TEST=no])
+	if test x"$TCL_TEST" = "xno"; then
+		AC_MSG_ERROR([tcl not found, try --disable-tcl, or install tcl properly.])
+	fi
+	LDFLAGS="$my_saved_LDFLAGS"
 fi
 
 if test x"$EXTRA" = "xyes"