Re: [Buildroot] [PATCH 1/2] package/passt: disable on uclibc

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello,

On Tue, Aug 18, 2026 at 01:55:33PM -0700, Joseph Kogut wrote:
> Upstream lists uClibc-ng support as a "nice-to-have, eventually", and
> tracks the required build fixes as an enhancement:
> 
> https://bugs.passt.top/show_bug.cgi?id=5
> 
> passt relies on interfaces and definitions missing from uClibc,
> resulting in build failures such as:
> 
> qrap.c:145:25: error: 'ARG_MAX' undeclared
> tcp.c:2926:34: error: storage size of 'wnd' isn't known
> tcp.c:3321:47: error: 'TCP_SEND_QUEUE' undeclared
> 
> Disable passt for uClibc toolchains and propagate the dependency to
> Podman's passt backend.
> 
> Fixes:
>  - http://autobuild.buildroot.org/results/7e4/7e4434e01baece4d090e44b4b3713f2eeefc1e27/
>  - http://autobuild.buildroot.org/results/3f6/3f60889b4599f1bc42a69076f6fe469517ea9ab5/
> 
> Signed-off-by: Joseph Kogut <joseph@anodize.com>

Thanks, I have applied.

However:

- ARG_MAX is not a standard definition, the code should be using
  getconf() to get this kind of value

- The code uses ARG_MAX incorrectly. ARG_MAX is the maximum number of
  bytes occupied by arguments, but the code uses it as the max number
  of arguments.

For the other two problems, I guess a bug should be reported to
uClibc. I've Cc'ed Waldemar, uClibc-ng's maintainer.

> diff --git a/package/passt/Config.in b/package/passt/Config.in
> index fca1dff7c5..d06cc3e482 100644
> --- a/package/passt/Config.in
> +++ b/package/passt/Config.in
> @@ -1,5 +1,6 @@
>  config BR2_PACKAGE_PASST
>  	bool "passt"
> +	depends on !BR2_TOOLCHAIN_USES_UCLIBC

I added a comment above this to explain why.

Thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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