Prepare build configuration variables in Makefiles.

Introduce new Makefile variables BUILD_xxx in makeinclude file, generated
by configure. These variables may be used to select files to be compiled,
dependent on the build configuration.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11079 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

configure.in

@@ -67,6 +67,12 @@ AC_SUBST(FL_VERSION)
 AC_SUBST(ARCHFLAGS)
 AC_SUBST(OPTIM)
 
+dnl FLTK build options to be used in Makefiles (defined in makeinclude)
+BUILD_GDI="No"
+BUILD_X11="No"
+BUILD_XFT="No"
+USEMMFILES="No"
+
 dnl OS-specific pre-tests...
 dnl host_os_gui equals $host_os unless we target Cygwin or Darwin in combination with X11.
 host_os_gui=$host_os
@@ -829,8 +835,6 @@ AC_ARG_WITH(links, [  --with-links            make header links for common missp
 INSTALL_DESKTOP=""
 UNINSTALL_DESKTOP=""
 
-USEMMFILES="No"
-
 case $host_os_gui in
     cygwin* | mingw*)
 	dnl Cygwin environment, using windows GDI ...
@@ -843,6 +847,7 @@ case $host_os_gui in
 	LDFLAGS="-mwindows $LDFLAGS"
 	DSOFLAGS="-mwindows $DSOFLAGS"
 	LIBS="$LIBS -lole32 -luuid -lcomctl32"
+	BUILD_GDI="Yes"
 	if test "x$with_optim" = x; then
 	    dnl Avoid -Os optimization on Cygwin/MinGW
 	    with_optim="-O3"
@@ -938,6 +943,7 @@ case $host_os_gui in
 	LDFLAGS="$X_LIBS $LDFLAGS"
 	DSOFLAGS="$X_LIBS $DSOFLAGS"
 	AC_DEFINE(USE_X11)
+	BUILD_X11="Yes"
 	if test "x$x_includes" != x; then
 	    ac_cpp="$ac_cpp -I$x_includes"
 	fi
@@ -1002,6 +1008,7 @@ case $host_os_gui in
 		AC_CHECK_HEADER(X11/Xft/Xft.h,
 		    AC_CHECK_LIB(Xft, XftDrawCreate,
 			AC_DEFINE(USE_XFT)
+			BUILD_XFT="Yes"
 			LIBS="-lXft $LIBS"))
 	    fi
 	fi
@@ -1097,6 +1104,9 @@ AC_SUBST(THREADS)
 AC_SUBST(INSTALL_DESKTOP)
 AC_SUBST(UNINSTALL_DESKTOP)
 
+AC_SUBST(BUILD_GDI)
+AC_SUBST(BUILD_X11)
+AC_SUBST(BUILD_XFT)
 AC_SUBST(USEMMFILES)
 
 dnl Figure out the appropriate formatted man page extension...

makeinclude.in

@@ -26,6 +26,13 @@ FL_DSO_VERSION		= @FL_DSO_VERSION@
 FL_ABI_VERSION		= @FL_ABI_VERSION@
 FL_VERSION		= @FL_VERSION@
 
+# FLTK configuration options
+
+BUILD_GDI	= @BUILD_GDI@
+BUILD_X11	= @BUILD_X11@
+BUILD_XFT	= @BUILD_XFT@
+USEMMFILES	= @USEMMFILES@
+
 # Standard configure variables
 
 prefix		= @prefix@
@@ -39,7 +46,6 @@ mandir		= @mandir@
 srcdir		= @srcdir@
 docdir		= $(datadir)/doc/fltk
 VPATH		= @srcdir@
-USEMMFILES	= @USEMMFILES@
 
 # programs we use...
 DOXYDOC		= @DOXYDOC@