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The structure definition of dllimport seems to lack information and is not enough to generate an undecorated lib. #124956

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han1548772930 opened this issue May 10, 2024 · 3 comments
Open

The structure definition of dllimport seems to lack information and is not enough to generate an undecorated lib. #124956

han1548772930 opened this issue May 10, 2024 · 3 comments
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A-linkage Area: linking into static, shared libraries and binaries A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@han1548772930
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han1548772930 commented May 10, 2024 •
edited

Where rust calls llvm, the symbolname is left blank, which makes the structure definition of dllimport seem to lack information and is not enough to generate an undecorated lib.
FBCB13F97186228859BF21CB085FD4BA

{D68F8C74-9B96-A55C-E70C-ECE8D5F008CB}

712E7975E74D9587542E2CE1F801611A
9704252B8B4EA78E8088CAA9F83B871F
@han1548772930 han1548772930 added the C-bug Category: This is a bug. label May 10, 2024
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label May 10, 2024
@bjorn3
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bjorn3 commented May 11, 2024

Can you post a rust code snippet on which you are experiencing the issue and show the exact issue (linker error, other kind of compilation failure, ...)

@han1548772930
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#124958

@han1548772930 han1548772930 reopened this May 13, 2024
@ChrisDenton ChrisDenton mentioned this issue May 13, 2024
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@jieyouxu jieyouxu added A-linkage Area: linking into static, shared libraries and binaries A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. and removed needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. labels May 13, 2024
@dpaoliello
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I addressed this in #124958 (comment)

To summarize for this specific part of the issue:

  • Not setting SymbolName is a fair criticism, but I wouldn't want to change it now without an MCP and a motivating example where Rust has incorrect behavior.
  • You've demonstrated that Rust produces a different import library than MSVC or Clang but have not explained why this is an issue.

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A-linkage Area: linking into static, shared libraries and binaries A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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@dpaoliello @bjorn3 @jieyouxu @rustbot @han1548772930