Re: [PATCH v2 06/50] Add helper-to-tcg subproject

On Thu, 30 Jul 2026 05:09:40 +0200
Anton Johansson via qemu development <[email protected]> wrote:

> +project('helper-to-tcg', ['cpp'],
> +        version: '0.8',
> +        default_options: ['cpp_std=c++17'])
>
> ...
>
> +# Find LLVM using llvm-config manually.  Needed as meson struggles when multiple
> +# versions of LLVM are installed on the same system (always returns the most
> +# recent).
> +llvm_config = get_option('llvm_config_path')
> +cpp_args = run_command(llvm_config, '--cxxflags').stdout().strip().split()

`llvm-config --cxxflags` cotains `-std=`, which takes precedence over
`cpp_std=c++17`.
As a result, on LLVM 15, we get `-std=c++14` and the build fails.

I'd just add on the next line:

cpp_args += '-std=c++17'

And drop `default_options`.

-- 
Alessandro Di Federico
rev.ng Labs