Re: [Buildroot] [PATCH] package/cmake: bump host-cmake minimum version to 3.26

On Tue Aug 18, 2026 at 2:11 PM CEST, Alexis Lothoré wrote:

[...]

> And while I've not been able to make _any cmake-based C++ package_ build
> fail (so there is still one subtle detail I am not getting), I managed
> to make many package build fail on this exact same "stdlib.h not found"
> error:
>   - protobuf
>   - glog
>   - dbus-cxx
>   - sdbus-cpp
>   - log4cxx
>   - taglib
>   - sqlitecpp
>   - ...

A small clarification, because my english may be a bit broken here: I
did not manage to reproduce the issue for _all_ C+ cmake-based packages,
only for a part of the upstream packages. The failure to reproduce the
issue could be explain for some (eg: many C++ projects do not trigger
any build, those are self-contained in a single header, eg
json-for-modern-cpp), but as another example, paho-mqtt-cpp builds fine
in my setup, while I would have expected it to fail.

> As the issue affects many packages, and that the faulty cmake version is
> still shipped on some standard distributions, bump the minimal host-cmake
> version to 3.26 to prevent this issue.
>
> [0] https://gitlab.kitware.com/cmake/cmake/-/commit/607bccb4efe1
>
> Signed-off-by: Alexis Lothoré <[email protected]>
> ---
> Hi Buildroot community,
> this patch proposes a quite aggressive cmake bump, following a quite
> long investigation. While cmake 3.26 has been in the wild for more than
> 3 years, it has some non negligeable consequences for users and CI:
> host-cmake will be systematically built in more cases than today,
> extending the build time in the process. If that's a no-go, I am open to
> ideas about how to better handle this.

I also failed to mention that the issue affects 2025.02.x, 2026.05.x and
master.

Alexis

-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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