[PATCH -v1.1] Kbuild: Ignore GREP_OPTIONS env variable

[Borislav Petkov <bp@alien8.de>]

From: Borislav Petkov <bp@suse.de>
Subject: [PATCH] Kbuild: Ignore GREP_OPTIONS env variable

When building the kernel in a shell which defines GREP_OPTIONS so that
grep behavior is modified, we can break the generation of the syscalls
table like so:

__SYSCALL_COMMON(^[[01;31m^[[K0^[[m^[[K, sys_read, sys_read)
__SYSCALL_COMMON(^[[01;31m^[[K1^[[m^[[K, sys_write, sys_write)
__SYSCALL_COMMON(^[[01;31m^[[K1^[[m^[[K0, sys_mprotect, sys_mprotect) ...

This is just the initial breakage, later we barf when generating
modules.

In this case, GREP_OPTIONS contains "--color=always" which adds the shell
colors markup and completely fudges the headers under ...generated/asm/.

Fix that by unexporting the GREP_OPTIONS variable for the whole kernel
build as we tend to use grep at a bunch of places.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index 868c0eb67b08..73503a7755fd 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,9 @@ LC_COLLATE=C
 LC_NUMERIC=C
 export LC_COLLATE LC_NUMERIC
 
+# Avoid interference with shell env settings
+unexport GREP_OPTIONS
+
 # We are using a recursive build, so we need to do a little thinking
 # to get the ordering right.
 #
-- 
1.8.4

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--