payloads/external/GRUB2: Sanitize Makefile

We were explicitly passing CC and TARGET_CC to configure but overwrote
that decision later by passing CC (with the value of TARGET_CC) directly
to a recursive make call. The latter overwrite was introduced because
`unexport` alone doesn't work on variables that were specified on a make
command line (they are added to MAKEOVERRIDES and passed to further re-
cursive make calls).

Instead of unexporting random variables, unexport those that were actu-
ally passed from payloads/external/Makefile.inc and clear MAKEOVERRIDES.
Do not pass OBJDUMP as that is nowhere to be found in the GRUB sources.
And, last but not least, add --disable-werror because building GRUB is
very susceptible to changes in the flex version.

Change-Id: Iaff2c72e89a5a540fe365eacb84811d5cff9d4d4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/20990
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions