linux-kernel - [PATCH v2 10/14] selftests/nolibc: allow customize CROSS

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Message-Id: <39df39b4023831b796a1b21c7e31f4be0b432416.1689759351.git.falcon@tinylab.org>
Date:   Wed, 19 Jul 2023 21:28:17 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     w@....eu
Cc:     thomas@...ch.de, arnd@...db.de, falcon@...ylab.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v2 10/14] selftests/nolibc: allow customize CROSS_COMPILE by architecture

Some cross compilers may not just be prefixed with ARCH or XARCH,
customize them by architecture may easier the test a lot, especially,
when iterate with XARCH or ARCH.

After customizing this for every architecture, the minimal test argument
will be architecture itself, no CROSS_COMPILE will be passed.

If the installed cross compiler is not the same as the one customized,
we can also pass CROSS_COMPILE from command line as before, no
regression.

Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 tools/testing/selftests/nolibc/Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index a03fab020ebe..3c2be27747ea 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -42,6 +42,12 @@ IMAGE_loongarch  = arch/loongarch/boot/vmlinuz.efi
 IMAGE            = $(IMAGE_$(XARCH))
 IMAGE_NAME       = $(notdir $(IMAGE))
 
+# CROSS_COMPILE: cross toolchain prefix by architecture
+CROSS_COMPILE             ?= $(CROSS_COMPILE_$(XARCH))
+
+# make sure CC is prefixed with CROSS_COMPILE
+$(call allow-override,CC,$(CROSS_COMPILE)gcc)
+
 # default kernel configurations that appear to be usable
 DEFCONFIG_i386       = defconfig
 DEFCONFIG_x86_64     = defconfig
-- 
2.25.1