From: Thomas Petazzoni via buildroot <buildroot@buildroot.org>
To: Yegor Yefremov <yegorslists@googlemail.com>
Cc: buildroot@buildroot.org, Danomi Manchego <danomimanchego123@gmail.com>
Subject: Re: [Buildroot] [PATCH] package/libwebsockets: fix OpenSSL detection without libatomic
Date: Tue, 27 Oct 2026 17:09:03 +0100 [thread overview]
Message-ID: <auDMmNNMbgZTC16s@windsurf> (raw)
In-Reply-To: <20261027081659.3905442-1-yegorslists@googlemail.com>
On Tue, Oct 27, 2026 at 09:16:59AM +0100, Yegor Yefremov wrote:
> Since version 4.5.3, libwebsockets adds -latomic to the libraries used
> by its OpenSSL API probes whenever 64-bit atomics don't work out of the
> box, without checking that libatomic is available. Buildroot toolchains
> without thread support don't provide libatomic, so on a CPU without
> native 64-bit atomics (e.g. ARMv5) all probes fail to link:
>
> ld: cannot find -latomic: No such file or directory
>
> libwebsockets then assumes a pre-1.1 OpenSSL and fails to build:
>
> -- Performing Test HAVE_WORKING_ATOMIC_64 - Failed
> [...]
> -- Looking for HMAC_CTX_new - not found
> [...]
> include/libwebsockets/lws-genhash.h:93:18: error: field 'ctx' has incomplete type
> 93 | HMAC_CTX ctx;
> | ^~~
>
> Add a patch, sent upstream, to only use libatomic if linking against it
> makes the 64-bit atomics test pass.
>
> This issue has been present since commit 20c3eb6eb684
> ("package/libwebsockets: bump version to 4.5.7"), which bumped
> libwebsockets from 4.4.1 to 4.5.7, the atomic check having been added
> in 4.5.3. It therefore affects 2026.05 and later.
>
> Fixes:
> https://autobuild.buildroot.org/results/863c30265623973e15a25c2d38c0e1631a39b7e8
>
> Fixes: 20c3eb6eb68432c37d5db69963be266b7f2d23f7 ("package/libwebsockets: bump version to 4.5.7")
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Applied to master, thanks!
Best regards,
Thomas Petazzoni
--
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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prev parent reply other threads:[~2026-10-27 16:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-27 8:16 [Buildroot] [PATCH] package/libwebsockets: fix OpenSSL detection without libatomic Yegor Yefremov
2026-10-27 16:09 ` Thomas Petazzoni via buildroot [this message]
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