fix: Handle symbols with empty versions by mati865 · Pull Request #1480 · wild-linker/wild

mati865 · 2026-01-22T19:57:23Z

Not to confuse with symbols without versions, empty version is foo@. It has special properties, making the linker ignore version script lines regarding this symbol.

Before this PR, fuse2 would fail to build with "Symbol fuse_new has undefined version".

mati865

EDIT: fixed by ignoring symbols missing from one of the linkers.

This sort of duplicates symbol_diff.rs because missing symbols will be present in both cases, like in this case:

❯ WILD_REFERENCE_LINKER=ld.bfd ./run-with ~/Projects/wild/target/debug/wild
wild: ./bin
ref: ./bin.ref-linker
.gnu.hash
  wild Dynamic symbol `fuse_new` hash lookup found 128, expected 129
  ref Dynamic symbol `fuse_reply_statfs` hash lookup found 138, expected 139

.dynamic.DT_FLAGS_1.NOW
  wild 1
  ref

version.__fuse_exited
  wild
  ref global (hidden)

version.__fuse_loop_mt
  wild
  ref global (hidden)

version.__fuse_process_cmd
  wild
  ref global (hidden)

version.__fuse_read_cmd
  wild
  ref global (hidden)

version.__fuse_set_getcontext_func
  wild
  ref global (hidden)

version.__fuse_setup
  wild
  ref global (hidden)

version.__fuse_teardown
  wild
  ref global (hidden)

dynsym.__fuse_exited.section
  wild
  ref .text

dynsym.__fuse_loop_mt.section
  wild
  ref .text

dynsym.__fuse_process_cmd.section
  wild
  ref .text

dynsym.__fuse_read_cmd.section
  wild
  ref .text

dynsym.__fuse_set_getcontext_func.section
  wild
  ref .text

dynsym.__fuse_setup.section
  wild
  ref .text

dynsym.__fuse_teardown.section
  wild
  ref .text

mati865 · 2026-01-22T20:02:52Z

+        );
    }

+    values.sort_values();


Unfortunately, removing it doesn't fail Wild's tests, ATM.
This is necessary for cases when the same symbol has multiple versions like here:

version.fuse_new wild FUSE_2.5 (hidden),FUSE_2.6,FUSE_2.2 (hidden),global (hidden) ref FUSE_2.5 (hidden),global (hidden),FUSE_2.6,FUSE_2.2 (hidden)

mati865 · 2026-01-22T20:04:21Z

                // If we don't optimise a TLS access, then we'll have references to __tls_get_addr,
                // when GNU ld doesn't.
                "dynsym.__tls_get_addr.*",
+                "version.__tls_get_addr",


symbol_diff.rs uses a bit different formatting: dynsym.<section_name>.section, so there is an inconsistency here.

mati865 · 2026-01-23T10:35:41Z

EDIT: This also happens on loongarch64 but I don't test it locally.

@marxin any clue why dynsym is so much different between Wild and GNU ld only on RISC-V?
https://github.com/davidlattimore/wild/actions/runs/21263299851/job/61196004436

❯ readelf -WhsD /home/mateusz/Projects/wild/wild/tests/build/rust-integration-dynamic.rs/rdyn1.default-*.*.so | rg "File|entries" | sed "s#\s.*/rust-integration-dynamic.rs/# #g"
File: rdyn1.default-aarch64-3feecd11b8b8f5ad.ld.so
Symbol table for image contains 59 entries:
File: rdyn1.default-aarch64-3feecd11b8b8f5ad.wild.so
Symbol table for image contains 57 entries:
File: rdyn1.default-host-2c9e2ad080d8eb43.ld.so
Symbol table for image contains 57 entries:
File: rdyn1.default-host-2c9e2ad080d8eb43.wild.so
Symbol table for image contains 57 entries:
File: rdyn1.default-riscv64-8583f2504094e8de.ld.so
Symbol table for image contains 57 entries:
File: rdyn1.default-riscv64-8583f2504094e8de.wild.so
Symbol table for image contains 187 entries:

Details

❯ readelf -WsD /home/mateusz/Projects/wild/wild/tests/build/rust-integration-dynamic.rs/rdyn1.default-riscv64-8583f2504094e8de.wild.so

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❯ readelf -WsD /home/mateusz/Projects/wild/wild/tests/build/rust-integration-dynamic.rs/rdyn1.default-riscv64-8583f2504094e8de.ld.so

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mati865 · 2026-01-23T10:37:45Z

+        // TODO: this duplicates `symbol_diff.rs`
+        // On aarch64, GNU ld emits a dynamic symbol called "_stack", which it puts in some section
+        // or other that doesn't make sense. e.g. ".got.plt". It probably puts it in that section
+        // because it's closest to the value that it assigns to the symbol. It's not clear where
+        // this symbol comes from. It's neither in any input files, nor in GNU ld's built-in linker
+        // script.
+        if sym_name == b"_stack" {
+            continue;
+        }


This should be decided what to do here before merging, leaving a comment.

I was able to get GNU ld to emit "_start" in its linker script by running ld -m armelf --verbose on aarch64.

I copied this as is from symbol_diff.rs. Both symbol_diff.rs and this pass hit the same issues because they both iterate through .dynsym (pass from this PR also iterates through .gnu.version).

Ah, gotcha. The comment does seem written in the way I would write it :) I guess it could be good to have the shared logic in a single method - probably wouldn't be less code, but would make it clear that they're have the same logic.

Added DiffMode::IgnoreMissingValues, so we can get rid of the duplicated conditions.
Also, this allows removing the ignores for cases where only one of the linkers outputs a specific symbol. So this pass no longer duplicates missing symbols found by symbol_diff.rs.

Not to confuse with symbols without versions, empty version is `foo@`. It has special properties, making the linker ignore version script lines regarding this symbol. Before this PR, fuse2 would fail to build with "Symbol fuse_new has undefined version".

davidlattimore · 2026-01-27T22:40:42Z

+        // TODO: this duplicates `symbol_diff.rs`
+        // On aarch64, GNU ld emits a dynamic symbol called "_stack", which it puts in some section
+        // or other that doesn't make sense. e.g. ".got.plt". It probably puts it in that section
+        // because it's closest to the value that it assigns to the symbol. It's not clear where
+        // this symbol comes from. It's neither in any input files, nor in GNU ld's built-in linker
+        // script.
+        if sym_name == b"_stack" {
+            continue;
+        }


I was able to get GNU ld to emit "_start" in its linker script by running ld -m armelf --verbose on aarch64.

davidlattimore · 2026-01-27T22:45:24Z

+            //     return Ok(None);
+            // }
+
+            // There is a quirk that I couldn't find docs for. When a symbol has an empty version


Have you checked the behaviour of LLD? Does it do the same thing?

It doesn't mark unversioned symbol as hidden version, so we get this diff with LLD:

version.fuse_new wild FUSE_2.2 (hidden),FUSE_2.5 (hidden),FUSE_2.6,local or global (hidden) ref FUSE_2.2 (hidden),FUSE_2.5 (hidden),FUSE_2.6,local or global

FUSE_2.6 is non-hidden with all three linkers, local or global is hidden with GNU ld and Wild.

Other than that, it seems to be the same.

marxin · 2026-01-28T06:33:34Z

@marxin any clue why dynsym is so much different between Wild and GNU ld only on RISC-V?

That might be related to the fact that there are many (compared to other architectures) debug info relocations pointing to symbols: https://github.com/davidlattimore/wild/blob/f757450b8780f70a3a27334432ac93256191b9f4/libwild/src/layout.rs#L4925
but it's strange as the extra symbols are undefined and from glibc library. So my answer is - I don't know :)

mati865 · 2026-01-28T08:03:12Z

Other linkers don't have them, that's what puzzling me. Thanks anyway, I'll split out as a new issue.

davidlattimore

Thanks for fixing this and sorry about the delay reviewing, I didn't realise you were waiting for me

mati865 · 2026-02-06T12:43:49Z

It's fine, if it was something important I'd have pinged you sooner.

mati865 commented Jan 22, 2026

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mati865 commented Jan 23, 2026

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Comment thread linker-diff/src/version_diff.rs Outdated

mati865 marked this pull request as ready for review January 23, 2026 11:40

mati865 added 5 commits January 27, 2026 13:15

ignore local vs global version diff

c660300

Ignore x86_64 failures on Ubuntu and OpenSUSE

af59319

Ignore dynsym version diffs on RISC-V

02e32e3

Also ignore diffs on loongarch64

a123ba3

mati865 force-pushed the push-skxmwsnxwkts branch from 1a5717b to a123ba3 Compare January 27, 2026 12:16

davidlattimore approved these changes Jan 27, 2026

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mati865 added 2 commits January 28, 2026 16:07

Ignore version diff for missing symbols

0c92bb3

Remove leftovers

853a050

mati865 mentioned this pull request Jan 28, 2026

Wild creates many more dynamic symbols on RISC-V and Loongarch #1493

Closed

davidlattimore approved these changes Feb 6, 2026

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mati865 merged commit ba0806c into wild-linker:main Feb 6, 2026
54 of 58 checks passed

mati865 deleted the push-skxmwsnxwkts branch February 6, 2026 12:44

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