linux-kernel - [PATCH v2 11/14] selftests/nolibc: customize CROSS

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Message-Id: <3056b81ad829b512ef89c2ae0772d92b69efa0cf.1689759351.git.falcon@tinylab.org>
Date:   Wed, 19 Jul 2023 21:29:24 +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 11/14] selftests/nolibc: customize CROSS_COMPILE for 32/64-bit powerpc

The little-endian powerpc64le compilers provided by Ubuntu and Fedora
are able to compile big endian kernel and big endian nolibc-test [1].

These default CROSS_COMPILE settings allow us to test target
architectures with:

    $ cd /path/to/tools/testing/selftests/nolibc/

    $ for arch in powerpc powerpc64 powerpc64le; do \
        make run-user XARCH=$arch | grep "status: "; \
      done

If want to use another cross compiler, please simply pass CROSS_COMPILE
or CC as before.

For example, it is able to build 64-bit nolibc-test with the big endian
powerpc64-linux-gcc crosstool from [2]:

    $ wget -c https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/13.1.0/x86_64-gcc-13.1.0-nolibc-powerpc64-linux.tar.xz
    $ tar xvf x86_64-gcc-13.1.0-nolibc-powerpc64-linux.tar.xz
    $ export PATH=$PWD/gcc-13.1.0-nolibc/powerpc64-linux/bin/:$PATH

    $ export CROSS_COMPILE_powerpc64=powerpc64-linux-
    $ export CROSS_COMPILE_powerpc64le=powerpc64-linux-
    $ for arch in powerpc64 powerpc64le; do \
        make run-user XARCH=$arch | grep "status: "; \
      done

Or specify CC directly with full path:

    $ export CC=$PWD/gcc-13.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc
    $ for arch in powerpc64 powerpc64le; do \
        make run-user XARCH=$arch | grep "status: "; \
      done

[1]: https://github.com/open-power/skiboot
[2]: https://mirrors.edge.kernel.org/pub/tools/crosstool/

Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 tools/testing/selftests/nolibc/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 3c2be27747ea..eec2935672ad 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -43,6 +43,9 @@ IMAGE            = $(IMAGE_$(XARCH))
 IMAGE_NAME       = $(notdir $(IMAGE))
 
 # CROSS_COMPILE: cross toolchain prefix by architecture
+CROSS_COMPILE_powerpc     ?= powerpc-linux-gnu-
+CROSS_COMPILE_powerpc64   ?= powerpc64le-linux-gnu-
+CROSS_COMPILE_powerpc64le ?= powerpc64le-linux-gnu-
 CROSS_COMPILE             ?= $(CROSS_COMPILE_$(XARCH))
 
 # make sure CC is prefixed with CROSS_COMPILE
-- 
2.25.1