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[Build] Windows ARM64 build failure: undefined symbol __longjmp_wrapper in fast_setjmp_arm64.s

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
45/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
c, lua
領域
build-system, operating-systems

研究方向

檢查 3rd/bee.lua/3rd/lua-patch/fast_setjmp_arm64.s 與 3rd/bee.lua/3rd/lua55/ldo.c，著重於匯出符號及其 Windows ARM64 參照。執行 MSVC armasm64 建置，然後確認組譯階段已完成，且產生的可執行檔能夠連結並執行，同時不改變 fast_setjmp 或 fast_longjmp 的預期行為。

由索引模型根據 Issue 內容生成。

描述

Description:
When attempting to compile lua-language-server on Windows on Arm using the MSVC toolchain (armasm64), the build fails during the assembly phase of the bee.lua dependency.

The assembler throws an error because the file 3rd/bee.lua/3rd/lua-patch/fast_setjmp_arm64.s attempts to export a symbol that is never defined in the text area, while also failing to export fast_longjmp.

Environment:
OS: Windows 11 (Arm64)
Compiler: MSVC (Host: ARM64, Target: ARM64)
Tool: armasm64.exe

Error Logs:
[1/125] Compile ASM build/obj/source_lua/fast_setjmp_arm64.obj
FAILED: build/obj/source_lua/fast_setjmp_arm64.obj
armasm64 -nologo -o build/obj/source_lua/fast_setjmp_arm64.obj 3rd/bee.lua/3rd/lua-patch/fast_setjmp_arm64.s
C:\Code\Tools\lua-language-server\3rd\bee.lua\3rd\lua-patch\fast_setjmp_arm64.s(40) : error A2023: undefined symbol: __longjmp_wrapper
END
[6/125] Compile C build/obj/source_lua/onelua.obj
C:\Code\Tools\lua-language-server\3rd\bee.lua\3rd\lua55\ldo.c(131): warning C4013: 'fast_longjmp' undefined; assuming extern returning int
C:\Code\Tools\lua-language-server\3rd\bee.lua\3rd\lua55\ldo.c(169): warning C4013: 'fast_setjmp' undefined; assuming extern returning int
[14/125] Compile C++ build/obj/source_bee/error.obj
ninja: build stopped: subcommand failed.

Proposed Workaround / Fix:
I was able to successfully generate the executable by modifying fast_setjmp_arm64.s as follows:

  1. Removing the EXPORT __longjmp_wrapper line (as it has no corresponding label).
  2. Adding EXPORT fast_longjmp to ensure the symbol is visible to the C code in ldo.c

Modified Assembly Header:

    EXPORT fast_setjmp
    EXPORT fast_longjmp  ; Added this
    ; EXPORT __longjmp_wrapper ; Removed this as it caused error A2023: undefined symbol: __longjmp_wrapper

Questions/Concerns:
While this allows the build to complete and the server to run, I am not 100% sure if:

  1. __longjmp_wrapper was intended to be an alias for fast_longjmp for compatibility with specific Windows exception handling.
  2. There is a specific reason fast_longjmp was omitted from the exports in the original ARM64 patch.

Could the maintainers verify if this is the correct way to align the ARM64 assembly with the Windows MSVC requirements?

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