cyb70289 commented on issue #47229:
URL: https://github.com/apache/arrow/issues/47229#issuecomment-3384204962
Set `MI_NO_OPT_ARCH=ON` does fix this issue per my test.
Same as Try 2 from @gobes. But re-run cmake doesn't update the flag, must
delete the build dir first.
```
# default build throws illegal instruction
~/arrow/python$ qemu-aarch64 -cpu cortex-a72 `which python` -c "import
pyarrow as pa; print(pa.__version__)"
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
Illegal instruction (core dumped)
# rebuild with this patch
diff --git a/cpp/cmake_modules/ThirdpartyToolchain.cmake
b/cpp/cmake_modules/ThirdpartyToolchain.cmake
index 2b9b2a7..a3f08d8 100644
--- a/cpp/cmake_modules/ThirdpartyToolchain.cmake
+++ b/cpp/cmake_modules/ThirdpartyToolchain.cmake
@@ -2294,7 +2294,8 @@ if(ARROW_MIMALLOC)
-DMI_LOCAL_DYNAMIC_TLS=ON
-DMI_BUILD_OBJECT=OFF
-DMI_BUILD_SHARED=OFF
- -DMI_BUILD_TESTS=OFF)
+ -DMI_BUILD_TESTS=OFF,
+ -DMI_NO_OPT_ARCH=ON)
externalproject_add(mimalloc_ep
${EP_COMMON_OPTIONS}
# verify patch is effective after build
~/arrow/cpp/build$ grep MI_NO_OPT_ARCH
./mimalloc_ep-prefix/src/mimalloc_ep-build/CMakeCache.txt
MI_NO_OPT_ARCH:BOOL=ON
# new build works okay
~/arrow/python$ qemu-aarch64 -cpu cortex-a72 `which python` -c "import
pyarrow as pa; print(pa.__version__)"
22.0.0a1.dev1+gfcf3b4bde.d20251009
```
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