[C++][Release] verify-rc-source-windows fails with latest simdjson (5.0.1) from conda

Describe the bug, including details regarding any error messages, version, and platform.

Verification job for Windows is failing with the following:

   unity_1_cxx.cxx
  unity_0_cxx.cxx
C:\tmp\arrow-verify-release\conda-env\Library\include\simdjson.h(97474,68): error C3861: '__builtin_ctz': identifier not found [D:\a\crossbow\crossbow\arrow\cpp\build\src\arrow\arrow_json_shared.vcxproj]
  (compiling source file 'CMakeFiles/arrow_json_shared.dir/Unity/unity_0_cxx.cxx')
  
C:\tmp\arrow-verify-release\conda-env\Library\include\simdjson.h(97474,68): error C3861: '__builtin_ctz': identifier not found [D:\a\crossbow\crossbow\arrow\cpp\build\src\arrow\arrow_json_shared.vcxproj]
  (compiling source file 'CMakeFiles/arrow_json_shared.dir/Unity/unity_1_cxx.cxx')
  
  Creating directories for 'mimalloc_ep'
  Building Custom Rule D:/a/crossbow/crossbow/arrow/cpp/CMakeLists.txt

I think it is related to the following issue and the latest simdjson (simdjson-5.0.1) on conda.

Build fails when __SSE2__ is defined on msvc simdjson/simdjson#2864

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@pitrou

@pitrou @kou @Reranko05 is this a blocker? Should I just pin simdjson < 5 or use bundled on the verification job for Windows?

Marking this potentially as 26.0.0 until feedback even though I think it's not a blocker.

I think that this is not a blocker.

It seems that

arrow/cpp/cmake_modules/SetupCxxFlags.cmake

Line 56 in e85e181

add_definitions(-D__SSE2__ -D__SSE4_1__ -D__SSE4_2__)

introduced by #46963 is the cause of this. It's already included in our past releases. We can fix it in the next release.

BTW, I feel that the approach used by #46963 is not a good approach because it always defines __*__ globally by add_definitions() (other SIMD related flags cares about ARROW_SIMD_LEVEL) and we should not define __*__ macros as much as possible (I think that simdjson/simdjson#2864 (comment) is correct).

@raulcd

@raulcd I don't think this is a blocker either.

One other related point: simdjson 5.0.2 also includes a fix for an empty-input issue in truncated_bytes() (simdjson#2889) that we're currently working around in #51038. So once we fix the __*__ definitions on our side and can bump simdjson, we'll also pick up that fix.

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[C++][Release] verify-rc-source-windows fails with latest simdjson (5.0.1) from conda #51690

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[C++][Release] verify-rc-source-windows fails with latest simdjson (5.0.1) from conda #51690

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raulcd commented on Oct 2, 2026

raulcd commented on Oct 2, 2026

kou commented on Oct 2, 2026

Reranko05 commented on Oct 3, 2026

Reranko05 commented on Oct 6, 2026

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