linux-kernel - Re: [RFC] perf build: Allow passing extra Clang flags via EXTRA_CLANG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251015093037.GA109737@e132581.arm.com>
Date: Wed, 15 Oct 2025 10:30:37 +0100
From: Leo Yan <leo.yan@....com>
To: hupu <hupu.gm@...il.com>
Cc: Ian Rogers <irogers@...gle.com>, namhyung@...nel.org,
	peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	mark.rutland@....com, alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org, adrian.hunter@...el.com, nathan@...nel.org,
	nick.desaulniers+lkml@...il.com, morbo@...gle.com,
	justinstitt@...gle.com, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [RFC] perf build: Allow passing extra Clang flags via
 EXTRA_CLANG_FLAGS

Hi hupu,

On Tue, Oct 14, 2025 at 10:31:55AM +0800, hupu wrote:

[...]

> > I am not 100% sure, could you execute install kernel headers and then
> > build perf ?
> >
> >   make headers_install
> >
> 
> I am currently building perf for arm64 in an Ubuntu environment using
> a cross toolchain, rather than compiling the entire perf directly with
> Clang. Clang is only invoked during the build process when the BPF
> option is enabled — as shown below where bpf is detected as on:

Have you installed the GCC cross packages ?

 $ sudo apt-get install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
 $ sudo apt-get install libc6-dev-aarch64-cross linux-libc-dev-aarch64-cross
 $ sudo apt-get install libc6-dev-arm64-cross linux-libc-dev-arm64-cross

My understanding is arm64 cross compilation tries to find headers in the
path /usr/aarch64-linux-gnu/include/ (I confirmed this on Ubuntu/Debian
distros).  After install GCC cross packages, the headers should appear
in the folder.

Thanks,
Leo