[all-commits] [llvm/llvm-project] 69ea17: llvm-shlib: Fix mingw dll exports (#148772)

[Keno Fischer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 69ea174bf07533b7f63139f78b0ec3d3766aedc4
      https://github.com/llvm/llvm-project/commit/69ea174bf07533b7f63139f78b0ec3d3766aedc4
  Author: Keno Fischer <keno at juliahub.com>
  Date:   2025-07-15 (Tue, 15 Jul 2025)

  Changed paths:
    M llvm/tools/llvm-shlib/CMakeLists.txt

  Log Message:
  -----------
  llvm-shlib: Fix mingw dll exports (#148772)

In c87d198cd964f37343083848f8fdd58bb0b00156, the `__jit_debug_*` symbols
gained explicit dllexport annotations. Unfortunately, mingw's linkers
have a quirk where the presence of any dllexport symbols at all will
switch off the `-export-all-symbols` flag, so without a full conversion
to dllexport annotations (#109483), the mingw LLVM dll build is broken
in LLVM 20+ when building with GCC (when building with clang,
LLVM_ALWAYS_EXPORT expands to the default visibility attribute,
see extended discussion in #148772).
Fix this by adding the flag explicitly as was done for
clang-shlib earlier in https://reviews.llvm.org/D151620.



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