rust: allow linking with dynamic libstd #14224
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Allow adding extra directories to the rpath. Rust needs this when Rustup is in use. Signed-off-by: Paolo Bonzini <[email protected]>
RustCompiler.build_rpath_args works by appending the directory to the arguments computed by self.linker.build_rpath_args. This does not work if there is no argument to begin with, which happens for example in program crates. Use the new extra_paths argument to force inclusion of the libdir into the rpath of the binary, even in that case. Signed-off-by: Paolo Bonzini <[email protected]>
As an initial implementation, simply adding "-C prefer-dynamic" works for binary crates (as well as dylib and proc-macro that already used it). In the future this could be extended to other crate types. For more information see the comment in the changed file, as well as mesonbuild#8828 and mesonbuild#14215. Signed-off-by: Paolo Bonzini <[email protected]>
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lf-
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Feb 23, 2025
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| # -Z staticlib-prefer-dynamic) are not yet stable; alternatively, | ||
| # one could use "--emit obj" (implemented in the pull request at | ||
| # https://github.com/mesonbuild/meson/pull/11213) or "--emit rlib" | ||
| # (officially not recommended for linking with C programs). |
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cdylibs should be okay for this i think?
-Cprefer-dynamic just works on cdylibs today.
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| for arg in args: | ||
| rustc_rpath_args.append('-C') | ||
| rustc_rpath_args.append(f'link-arg={arg}:{self.get_target_libdir()}') | ||
| rustc_rpath_args.append('link-arg=' + arg) |
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quasi related, btw: meson currently doesn't have a unified way to specifically pass link args for rust, only these ad-hoc spots #13537
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As a first step towards fixing #8828, allow linking Rust bin crates with dynamic libstd.
staticlib and cdylib crates cannot yet do this, but this can be extended later on; in the meanwhile, this PR creates the API with a minimal implementation.