cups: add pdftops option

The pdftops support in cups needs C++ support, whereas the rest doesn't.
Add a BR2_PACKAGE_CUPS_PDFTOPS (depending on C++ support) to enable it
if needed.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/cups/Config.in

@@ -4,3 +4,16 @@ config BR2_PACKAGE_CUPS
 	  The Common Unix Printing System
 
 	  http://www.cups.org
+
+if BR2_PACKAGE_CUPS
+
+config BR2_PACKAGE_CUPS_PDFTOPS
+       bool "pdftops support"
+       depends on BR2_INSTALL_LIBSTDCPP
+       help
+         Enable pdftops support
+
+comment "pdftops support requires a toolchain with C++ support enabled"
+	depends on !BR2_INSTALL_LIBSTDCPP
+
+endif

package/cups/cups.mk

@@ -58,6 +58,12 @@ else
 	CUPS_CONF_OPT +=	--disable-python
 endif
 
+ifeq ($(BR2_PACKAGE_CUPS_PDFTOPS),y)
+	CUPS_CONF_OPT += --enable-pdftops
+else
+	CUPS_CONF_OPT += --disable-pdftops
+endif
+
 $(DL_DIR)/$(CUPS_SOURCE):
 	 $(call DOWNLOAD,$(CUPS_SITE),$(CUPS_SOURCE))