linux-kernel - Perf not able to cross compile

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Date: Thu, 1 Feb 2024 12:32:09 +0100
From: Anders Roxell <anders.roxell@...aro.org>
To: linux-perf-users@...r.kernel.org, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, james.clark@....com, Arnd Bergmann <arnd@...db.de>, 
	Mark Brown <broonie@...nel.org>
Subject: Perf not able to cross compile

Hey,

I'm trying to cross compile perf ARCH=arm64 on my x86_64 host from
linus tree [1], branch master.

This is the failue I see, full log [2]:

..
  CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/libbpf/staticobjs/elf.o
  CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/libbpf/staticobjs/features.o
cc1: error: ‘-fcf-protection=full’ is not supported for this target
error: command '/usr/local/bin/sccache' failed with exit code 1
cp: cannot stat
'/home/tuxbuild/.cache/tuxmake/builds/1/build/python_ext_build/lib/perf*.so':
No such file or directory
make[2]: *** [Makefile.perf:678:
/home/tuxbuild/.cache/tuxmake/builds/1/build/python/perf.cpython-311-x86_64-linux-gnu.so]
Error 1
make[2]: *** Waiting for unfinished jobs....
  LD      /home/tuxbuild/.cache/tuxmake/builds/1/build/libbpf/staticobjs/libbpf-in.o
  LINK    /home/tuxbuild/.cache/tuxmake/builds/1/build/libbpf/libbpf.a
make[1]: *** [Makefile.perf:261: sub-make] Error 2
make: *** [Makefile:70: all] Error 2

Running 'x86_64-linux-gnu-python3-config --cflags' I see
'-fcf-protection' in the output and this happens when I'm building
cross compile arm64 on my x86_64 host machine. Building on an arm64
host works. cross compile x86_64 on my x86_64 host works too.

I have 'aarch64-linux-gnu-python3-config' installed but that isn't used.

$ x86_64-linux-gnu-python3-config --cflags
-I/usr/include/python3.11 -I/usr/include/python3.11  -Wsign-compare -g
  -fstack-protector-strong -fstack-clash-protection -Wformat
-Werror=format-security -fcf-protection  -DNDEBUG -g -fwrapv -O2 -Wall
$ aarch64-linux-gnu-python3-config --cflags
-I/usr/include/python3.11 -I/usr/include/python3.11  -Wsign-compare -g
  -fstack-protector-strong -fstack-clash-protection -Wformat
-Werror=format-security -mbranch-protection=standard  -DNDEBUG -g
-fwrapv -O2 -Wall

I tried to set PYTHON and PYTHON_CONFIG too, but didn't work.

It doesn't try to use $(CROSS_COMPILE)python3-config, any idea how to
use the correct config?

Cheers,
Anders
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[2]  https://storage.tuxsuite.com/public/linaro/lkft/builds/2bc6x6cISHzG9Jgo0oAVv2OgLOG/build.log