linux-kernel - [PATCH v2 5/7] selftests/nolibc: customize CROSS

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Message-Id: <a5deb231269cff5225be8331888fbea19337d5f9.1691783604.git.falcon@tinylab.org>
Date:   Sat, 12 Aug 2023 04:32:41 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     falcon@...ylab.org, w@....eu
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        tanyuan@...ylab.org, thomas@...ch.de
Subject: [PATCH v2 5/7] selftests/nolibc: customize CROSS_COMPILE for all architectures

This simplifies the 'make' commands for nolibc supported architectures,
only requires the XARCH option now.

As suggested by Willy, the small, newest and obtainable cross toolchains
from [1] are customized by default, users must download, decompress and
configure the bin/ path to the PATH environment variable manually.

If still want to use a cross toolchain from local software repositories,
we can also pass CROSS_COMPILE, CROSS_COMPILE_$(XARCH) or even CC from
command line.

After carefully install and configure $(CROSS_COMPILE_$(XARCH)),
qemu-system-$(XARCH) and qemu-$(XARCH), it is able to run tests for the
architectures or their variants like this:

    $ ARCHS="i386 x86_64 arm64 arm mips ppc ppc64 ppc64le riscv s390 loongarch"
    $ for arch in ${ARCHS[@]}; do printf "%9s: " $arch; make run-user XARCH=$arch | grep status; done
    $ for arch in ${ARCHS[@]}; do printf "%9s: " $arch; make defconfig run XARCH=$arch | grep status; done

[1]: https://mirrors.edge.kernel.org/pub/tools/crosstool/

Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 tools/testing/selftests/nolibc/Makefile | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 5aff60d31d72..9a787fdf9842 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -55,6 +55,27 @@ IMAGE            = $(IMAGE_$(XARCH))
 IMAGE_NAME       = $(notdir $(IMAGE))
 
 # CROSS_COMPILE: cross toolchain prefix by architecture
+#
+# Notes,
+# - The small, newest and obtainable cross toolchains from [1] are recommended,
+#   Please download, decompress and add the bin/ path to 'PATH' env variable
+# - To use another cross compiler, pass 'CROSS_COMPLE', 'CROSS_COMPILE_$(XARCH)'
+#   by variant or even 'CC' from command line
+#
+# [1]: https://mirrors.edge.kernel.org/pub/tools/crosstool/
+
+CROSS_COMPILE_i386      ?= x86_64-linux-
+CROSS_COMPILE_x86_64    ?= x86_64-linux-
+CROSS_COMPILE_x86       ?= x86_64-linux-
+CROSS_COMPILE_arm64     ?= aarch64-linux-
+CROSS_COMPILE_arm       ?= arm-linux-gnueabi-
+CROSS_COMPILE_mips      ?= mips64-linux-
+CROSS_COMPILE_ppc       ?= powerpc64-linux-
+CROSS_COMPILE_ppc64     ?= powerpc64-linux-
+CROSS_COMPILE_ppc64le   ?= powerpc64-linux-
+CROSS_COMPILE_riscv     ?= riscv64-linux-
+CROSS_COMPILE_s390      ?= s390-linux-
+CROSS_COMPILE_loongarch ?= loongarch64-linux-
 CROSS_COMPILE           ?= $(CROSS_COMPILE_$(XARCH))
 
 # Make CC is always prefixed with $(CROSS_COMPILE)
-- 
2.25.1