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 <pbonzini@redhat.com>
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 <pbonzini@redhat.com>
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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 <pbonzini@redhat.com>
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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.