package/nodejs: fix architectural dependencies on ARM

On ARM, starting with v0.12.x, the V8 JS engine is now requires at least
an armv6 and at least a VFPv2.

Since we're about to introduce the v4.x version, which has the same
requirements, introduce an intermediate variable to hold that condition.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Jörg Krause <joerg.krause@embedded.rocks>
Cc: Martin Bark <martin@barkynet.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/nodejs/Config.in

@@ -25,6 +25,15 @@ comment "nodejs needs a toolchain w/ C++, dynamic library, threads"
 
 if BR2_PACKAGE_NODEJS
 
+# Starting with 0.12.x, on ARM, V8 (the JS engine)
+# now requires an armv6+ and a VFPv2+.
+config BR2_PACKAGE_NODEJS_V8_ARCH_SUPPORTS
+	bool
+	# On supported architectures other than ARM, no special requirement
+	default y if !BR2_arm
+	# On ARM, at least ARMv6+ with VFPv2+ is needed
+	default y if !BR2_ARM_CPU_ARMV5 && BR2_ARM_CPU_HAS_VFPV2
+
 choice
 	prompt "Node.js version"
 	default BR2_BR2_PACKAGE_NODEJS_0_10_X if BR2_ARM_CPU_ARMV5
@@ -35,10 +44,9 @@ choice
 config BR2_BR2_PACKAGE_NODEJS_0_10_X
 	bool "v0.10.40"
 
-# V8 included with v0.12.5 requires at least ARMv6
 config BR2_BR2_PACKAGE_NODEJS_0_12_X
 	bool "v0.12.7"
-	depends on !BR2_ARM_CPU_ARMV5
+	depends on BR2_PACKAGE_NODEJS_V8_ARCH_SUPPORTS
 
 endchoice