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The nightly job Verify release candidate on macOS intermittently aborts the C++ build with Library not loaded: @rpath/libLLVM.22.1.dylib).
Conda's LLVM tools resolve libLLVM via @loader_path/../lib and can point at the package cache which has no libLLVM. The conda env lib dir is not on the loader path.
Not caused by LLVM 22.1.8 (initial incorrect assessment). The same packages 22.1.8 pass in other runs.
What changes are included in this PR?
Add $CONDA_PREFIX/lib to DYLD_FALLBACK_LIBRARY_PATH for the step cmake --build.
(Fallback is searched last, so it resolves the @rpath miss without shadowing system libraries.)
Also drop unneeded empty element from DYLD_LIBRARY_PATH/LD_LIBRARY_PATH assignment (trailing : when the variable was unset).
Are these changes tested?
Tested by nightly jobs verify-rc-source--macos-conda- : cpp, integration and python tasks pass.
tadeja
changed the title
GH-50242: [C++][Release] Pin LLVM <22 in conda env to avoid LLVM 22.1.8 on macOS
GH-50242: [Release] Fix flaky libLLVM load failure in macOS verify-rc build
Jun 24, 2026
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tadeja
changed the title
Rationale for this change
The nightly job Verify release candidate on macOS intermittently aborts the C++ build with
Library not loaded: @rpath/libLLVM.22.1.dylib).Conda's LLVM tools resolve
libLLVMvia@loader_path/../liband can point at the package cache which has nolibLLVM. The conda env lib dir is not on the loader path.Not caused by LLVM 22.1.8 (initial incorrect assessment). The same packages 22.1.8 pass in other runs.
What changes are included in this PR?
Add
$CONDA_PREFIX/libtoDYLD_FALLBACK_LIBRARY_PATHfor the stepcmake --build.(Fallback is searched last, so it resolves the
@rpathmiss without shadowing system libraries.)Also drop unneeded empty element from DYLD_LIBRARY_PATH/LD_LIBRARY_PATH assignment (trailing
:when the variable was unset).Are these changes tested?
Tested by nightly jobs verify-rc-source--macos-conda- : cpp, integration and python tasks pass.
Are there any user-facing changes?
No.