grub2.inc: avoid passing -isystem to native builds

grub2 creates its own set of -nostdinc / -isystem / -ffreestanding
CFLAGS and OE's default BUILD_CFLAGS (assigned to CFLAGS for native
builds) etc, conflict with that.

(From OE-Core rev: b15b52dc8ab7dd273605c7dfd524c0a330bfd60b)

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

1 files changed, 9 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc
index 5a12563975..0fdafd5c1b 100644
--- a/meta/recipes-bsp/grub/grub2.inc
+++ b/meta/recipes-bsp/grub/grub2.inc
@@ -44,6 +44,15 @@ PACKAGECONFIG ??= ""
 PACKAGECONFIG[grub-mount] = "--enable-grub-mount,--disable-grub-mount,fuse"
 PACKAGECONFIG[device-mapper] = "--enable-device-mapper,--disable-device-mapper,lvm2"
 
+# grub2 creates its own set of -nostdinc / -isystem / -ffreestanding CFLAGS and
+# OE's default BUILD_CFLAGS (assigned to CFLAGS for native builds) etc, conflict
+# with that. Note that since BUILD_CFLAGS etc are not used by grub2 target
+# builds, it's safe to clear them unconditionally for both target and native.
+BUILD_CPPFLAGS = ""
+BUILD_CFLAGS = ""
+BUILD_CXXFLAGS = ""
+BUILD_LDFLAGS = ""
+
 do_configure_prepend() {
         # The grub2 configure script uses variables such as TARGET_CFLAGS etc
         # for its own purposes. Remove the OE versions from the environment to