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rust: allow older version of bindgen

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Cope with the old version that is provided in Debian 12.

--size_t-is-usize is needed on bindgen <0.61.0, and it was removed in
bindgen 0.65.0, so check for it in meson.build.

--merge-extern-blocks was added in 0.61.0.

--formatter rustfmt was added in 0.65.0 and is the default, so remove it.

Apart from Debian 12 and Ubuntu 22.04, all other supported distros have
version 0.66.x of bindgen or newer (or do not have bindgen at all).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-10-15 15:00:41 +02:00
parent ce4a144cf8
commit c2988dfbb0
2 changed files with 39 additions and 4 deletions
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12
docs/about/build-platforms.rst
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@ -107,6 +107,18 @@ Python build dependencies
required, it may be necessary to fetch python modules from the Python
Package Index (PyPI) via ``pip``, in order to build QEMU.
Rust build dependencies
QEMU is generally conservative in adding new Rust dependencies, and all
of them are included in the distributed tarballs. One exception is the
bindgen tool, which is too big to package and distribute. The minimum
supported version of bindgen is 0.60.x. For distributions that do not
include bindgen or have an older version, it is recommended to install
a newer version using ``cargo install bindgen-cli``.
Developers may want to use Cargo-based tools in the QEMU source tree;
this requires Cargo 1.74.0. Note that Cargo is not required in order
to build QEMU.
Optional build dependencies
Build components whose absence does not affect the ability to build
QEMU may not be available in distros, or may be too old for QEMU's