toolchain: add 4.0.x choice for headers

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

toolchain/toolchain-common.in

@@ -222,10 +222,15 @@ config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 	bool
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 
+config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
+	bool
+	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
+
 # This order guarantees that the highest version is set, as kconfig
 # stops affecting a value on the first matching default.
 config BR2_TOOLCHAIN_HEADERS_AT_LEAST
 	string
+	default "4.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 	default "3.19" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 	default "3.18" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 	default "3.17" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17

toolchain/toolchain-external/Config.in

@@ -1018,6 +1018,10 @@ choice
 	    m = ( LINUX_VERSION_CODE >> 8  ) & 0xFF
 	    p = ( LINUX_VERSION_CODE >> 0  ) & 0xFF
 
+config BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_0
+	bool "4.0.x"
+	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
+
 config BR2_TOOLCHAIN_EXTERNAL_HEADERS_3_19
 	bool "3.19.x"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19