Re: Perf not able to cross compile

[Arnaldo Carvalho de Melo]

Em Thu, Feb 01, 2024 at 12:32:09PM +0100, Anders Roxell escreveu:
> 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

We have some checks to deal with unknown options that came from python,
perl config, but it seems in your case there is something that is not
being covered, worth of further investigation.

Can you simply first try disabling python support? Look at
tools/perf/Makefile.perf, first trying with NO_LIBPYTHON=1 to your
make command line?

- Arnaldo

> 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

-- 

- Arnaldo