icecc.bbclass: prevent nativesdk builds depending on target specific KERNEL_CC

* without this we cause nativesdk-linux-libc-headers to depend
  on target specific KERNEL_CC (through icecc_get_tool ->
  icecc_is_kernel -> KERNEL_CC -> HOST_CC_KERNEL_ARCH ->
  TARGET_CC_KERNEL_ARCH -> TUNE_FEATURES(thumb) as shown by
  bitbake-diffsigs:

  OE qemux86@ ~/build/oe-core $ ls /OE/build/oe-core/tmp-glibc/sstate-diff/1499859497/qemu*/*sdk*/*/*do_configure.sigdata*
  /OE/build/oe-core/tmp-glibc/sstate-diff/1499859497/qemuarm/x86_64-nativesdk-oesdk-linux/nativesdk-linux-libc-headers/4.10-r0.do_configure.sigdata.3a9a423878d56524e0ee8e42eba1804f
  /OE/build/oe-core/tmp-glibc/sstate-diff/1499859497/qemux86/x86_64-nativesdk-oesdk-linux/nativesdk-linux-libc-headers/4.10-r0.do_configure.sigdata.401071dbaa88903ece37d35a47965ff2

  OE qemux86@ ~/build/oe-core $ bitbake-diffsigs /OE/build/oe-core/tmp-glibc/sstate-diff/1499859497/qemu*/*sdk*/*/*do_configure.sigdata*
  basehash changed from 39774238b66763c598153132e87a2c1a to aa2d66e770bf533e312536eb0a401c4c
  Variable TARGET_CC_KERNEL_ARCH value changed from '${@bb.utils.contains('TUNE_FEATURES', 'thumb', '-mno-thumb-interwork-marm', '', d)} TUNE_FEATURES{thumb} = Set' to ''

(From OE-Core rev: aef5d6052a60f506e842110381a221aed042e054)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta/classes/icecc.bbclass b/meta/classes/icecc.bbclass
index 8a3308bdda..1cc1c4ddb0 100644
--- a/meta/classes/icecc.bbclass
+++ b/meta/classes/icecc.bbclass
@@ -42,6 +42,7 @@ def icecc_dep_prepend(d):
 
 DEPENDS_prepend += "${@icecc_dep_prepend(d)} "
 
+get_cross_kernel_cc[vardepsexclude] += "KERNEL_CC"
 def get_cross_kernel_cc(bb,d):
     kernel_cc = d.getVar('KERNEL_CC', False)