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/... $ 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@tinylab.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