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From: Angus Lees <gus@debian.org>
Date: Thu, 14 Jul 2022 13:17:39 +0200
Subject: Set DT_SONAME when building dylibs
Forwarded: no
In Rust, library filenames include a version-specific hash to help
the run-time linker find the correct version. Unlike in C/C++, the
compiler looks for all libraries matching a glob that ignores the
hash and reads embedded metadata to work out versions, etc.
The upshot is that there is no need for the usual "libfoo.so ->
libfoo-1.2.3.so" symlink common with C/C++ when building with Rust,
and no need to communicate an alternate filename to use at run-time
vs compile time. If linking to a Rust dylib from C/C++ however, a
"libfoo.so -> libfoo-$hash.so" symlink may well be useful and in
this case DT_SONAME=libfoo-$hash.so would be required. More
mundanely, various tools (eg: dpkg-shlibdeps) complain if they don't
find DT_SONAME on shared libraries in public directories.
This patch passes -Wl,-soname=$outfile when building dylibs (and
using a GNU linker).
---
compiler/rustc_codegen_ssa/src/back/link.rs | 7 +++++++
1 file changed, 7 insertions(+)
Index: rust/compiler/rustc_codegen_ssa/src/back/link.rs
===================================================================
--- rust.orig/compiler/rustc_codegen_ssa/src/back/link.rs
+++ rust/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -2363,6 +2363,13 @@ fn add_order_independent_options(
}
add_rpath_args(cmd, sess, codegen_results, out_filename);
+
+ if (crate_type == config::CrateType::Dylib || crate_type == config::CrateType::Cdylib)
+ && sess.target.linker_flavor.is_gnu() {
+ let filename = String::from(out_filename.file_name().unwrap().to_str().unwrap());
+ let soname = [String::from("-Wl,-soname=") + &filename];
+ cmd.args(&soname);
+ }
}
// Write the NatVis debugger visualizer files for each crate to the temp directory and gather the file paths.
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