util/cbmem: Provide a way to override coreboot path
Right now cbmem uses a fix path to reach coreboot src path (../../).
This makes it impossible to compile cbmem out of the coreboot tree (e.g.
copy just the cbmem directory elsewhere and compile).
This patch adapts the technique from cbfstool and adds a variable called
'TOP' which points to coreboot root directory and which can be
overridden at build time by providing it to make as an argument. This
will enable a stand-alone build of cbmem.
Change-Id: I2732f75310e10716e5aa74e094e0bf628ad22f0b
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69686
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
diff --git a/util/cbmem/Makefile b/util/cbmem/Makefile
index a170875..9219a08 100644
--- a/util/cbmem/Makefile
+++ b/util/cbmem/Makefile
@@ -2,7 +2,8 @@
## SPDX-License-Identifier: GPL-2.0-only
PROGRAM = cbmem
-ROOT = ../../src
+TOP ?= $(abspath ../..)
+ROOT = $(TOP)/src
CC ?= $(CROSS_COMPILE)gcc
INSTALL ?= /usr/bin/env install
PREFIX ?= /usr/local