dtolnay/linkme

"The encapsulation symbol needs to be retained under --gc-sections properly"

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#49 建立於 2022年7月9日

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描述

The current master branch fails to build on FreeBSD 14.0-CURRENT amd64, even though it still works on FreeBSD stable/13.

$ cargo test
...
  = note: ld: error: undefined symbol: __start_linkme_SHENANIGANS
          >>> referenced by x4z07wsgcl2z4i4
          >>>               /usr/home/somers/src/rust/linkme/target/debug/deps/distributed_slice-425b465e5440679a.x4z07wsgcl2z4i4.rcgu.o:(distributed_slice::SHENANIGANS::hca25c6519cd4df0f)
          >>> the encapsulation symbol needs to be retained under --gc-sections properly; consider -z nostart-stop-gc (see https://lld.llvm.org/ELF/start-stop-gc)
          
          ld: error: undefined symbol: __stop_linkme_SHENANIGANS
          >>> referenced by x4z07wsgcl2z4i4
          >>>               /usr/home/somers/src/rust/linkme/target/debug/deps/distributed_slice-425b465e5440679a.x4z07wsgcl2z4i4.rcgu.o:(distributed_slice::SHENANIGANS::hca25c6519cd4df0f)
          
          ld: error: undefined symbol: __start_linkme_EMPTY
          >>> referenced by x4z07wsgcl2z4i4
          >>>               /usr/home/somers/src/rust/linkme/target/debug/deps/distributed_slice-425b465e5440679a.x4z07wsgcl2z4i4.rcgu.o:(distributed_slice::test_empty::EMPTY::h31c7f9e37773eb8f)
          >>> the encapsulation symbol needs to be retained under --gc-sections properly; consider -z nostart-stop-gc (see https://lld.llvm.org/ELF/start-stop-gc)
          
          ld: error: undefined symbol: __stop_linkme_EMPTY
          >>> referenced by x4z07wsgcl2z4i4
          >>>               /usr/home/somers/src/rust/linkme/target/debug/deps/distributed_slice-425b465e5440679a.x4z07wsgcl2z4i4.rcgu.o:(distributed_slice::test_empty::EMPTY::h31c7f9e37773eb8f)
          
          ld: error: undefined symbol: __start_linkme_NONCOPY
          >>> referenced by x4z07wsgcl2z4i4
          >>>               /usr/home/somers/src/rust/linkme/target/debug/deps/distributed_slice-425b465e5440679a.x4z07wsgcl2z4i4.rcgu.o:(distributed_slice::test_non_copy::NONCOPY::h920eb5b4a050a94d)
          >>> the encapsulation symbol needs to be retained under --gc-sections properly; consider -z nostart-stop-gc (see https://lld.llvm.org/ELF/start-stop-gc)
          
          ld: error: undefined symbol: __stop_linkme_NONCOPY
          >>> referenced by x4z07wsgcl2z4i4
          >>>               /usr/home/somers/src/rust/linkme/target/debug/deps/distributed_slice-425b465e5440679a.x4z07wsgcl2z4i4.rcgu.o:(distributed_slice::test_non_copy::NONCOPY::h920eb5b4a050a94d)
          cc: error: linker command failed with exit code 1 (use -v to see invocation)
          

error: could not compile `linkme` due to previous error
error: could not compile `linkme` due to previous error
error: could not compile `linkme` due to previous error

貢獻者指南

研究方向
調查 FreeBSD 14.0 CURRENT 上的連結器錯誤。錯誤表明使用 gc sections 時，封裝符號 start linkme * 和 stop linkme * 未定義。根據 LLVM 文件，可以通過在連結器標誌中添加 z nostart stop gc 來解決。檢查 Rust 構建配置（例如 .cargo/config.toml）或 crate 的 build.rs，以有條件地為 FreeBSD 應用此標誌。或者，探索 crate 定義這些符號的方法是否需要針對新的連結器行為進行調整。
技術棧
rust
領域
build system
議題類型
錯誤
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
2
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 小時
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
活躍
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
清晰
前置要求
Rust
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
70