External toolchain C++ cross-compiler fix

External toolchain C++ cross-compiler fix

package/Makefile.in resets CXX to "" in TARGET_CONFIGURE_OPTS if
BR2_GCC_CROSS_CXX is not set to 'y'. However, when using an external
toolchain, BR2_GCC_CROSS_CXX is not set even if the toolchain has a
C++ cross-compiler.

This patch adds a new BR2_GCC_CROSS_CXX option in the external
toolchain configuration menu, so that just like BR2_INET_RPC,
BR2_INET_IPV6 and the others, it can be set according to the external
toolchain configuration.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

toolchain/external-toolchain/Config.in

@@ -93,6 +93,12 @@ config BR2_SOFT_FLOAT
 	help
 	  Set this option if the external toolchain supports soft float.
 
+config BR2_GCC_CROSS_CXX
+	bool "Toolchain has C++ cross-compiler ?"
+	help
+	  Set this option if the external toolchain has a C++
+	  cross-compiler.
+
 config BR2_TARGET_OPTIMIZATION
 	string "Target Optimizations"
 	default "-Os -pipe"