initramfs: only show the option when a Linux kernel is being built

Closes #2119

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -49,6 +49,7 @@
 	#2035: ipsec-tools-0.7.2 fails to build with gcc-4.4.x
 	#2038: Bump ncurses to 5.7
 	#2095: make gconfig: undefined reference to symbol 'dlsym@@GLIBC_2.2.5'
+	#2119: Tries to build kernel, although disabled in config
 
 2010.05, Released May 30th, 2010:
 

fs/initramfs/Config.in

@@ -1,5 +1,6 @@
 config BR2_TARGET_ROOTFS_INITRAMFS
 	bool "initramfs for initial ramdisk of linux kernel"
+	depends on BR2_LINUX_KERNEL
 	help
 	  Build a file which is usable for the gen_init_cpio tool
 	  at linux kernel build.
@@ -13,3 +14,5 @@ config BR2_TARGET_ROOTFS_INITRAMFS
 	  Device Drivers -> Block devices -> Initramfs source file(s).
 	  The configuration variable is CONFIG_INITRAMFS_SOURCE
 
+comment "initramfs requires a Linux kernel to be built"
+	depends on !BR2_LINUX_KERNEL