[Build] compiling errors for armeabi-v7a: vfmaq_f32 undecared

[weidu-tpvision]

Describe the issue

I am building onnxruntime for armeabi-v7a, so arm in 32 bits, the older versions are fine but today (Sep 4 2026) I did a git pull and then I ran into compiling errors all of which are related to MLAS, in particular, vfmaq_f32 undeclared.

I think it is only for armv8 but I need to build for armv7.

Urgency

No response

Target platform

armv7 and android

Build script

Below is how I build:
./build.sh
--config Release
--android
--android_abi armeabi-v7a
--android_api 29
--android_ndk_path $ANDROID_NDK_PATH
--build_shared_lib
--parallel
--skip_tests
--use_nnapi
--use_xnnpack
--cmake_extra_defines
"onnxruntime_DISABLE_TRAINING=ON"
"onnxruntime_USE_NEON=ON"
"onnxruntime_DISABLE_TRAINING=ON"
"onnxruntime_ENABLE_CPU_FP32_NCHWc_OPS=ON"
"onnxruntime_DISABLE_EXCEPTIONS=ON"
"onnxruntime_DISABLE_RTTI=ON"
"onnxruntime_BUILD_UNIT_TESTS=OFF"
"onnxruntime_USE_MLAS=OFF" \ # doesn't help but kept anyway
"MLAS_TARGET_ARCHITECTURE=generic" \ # doesn't help but kept anyway
"CMAKE_CXX_FLAGS=-DMLAS_TARGET_ARM=1" # doesn't help but kept anyway

Error / output

In fact all errors are vfmaq_f32 undecared and from MLAS. For example:
[ 6%] Building CXX object _deps/protobuf-build/CMakeFiles/libprotobuf-lite.dir/src/google/protobuf/generated_enum_util.cc.o
In file included from /home/weidu/WorkAtTPVision/test/xxx/onnxruntime/onnxruntime/core/mlas/lib/sgemm.cpp:18:
/home/weidu/WorkAtTPVision/test/xxx/onnxruntime/onnxruntime/core/mlas/lib/mlasi.h:2283:12: error: use of undeclared identifier 'vfmaq_f32'
return vfmaq_f32(Vector3, Vector1, Vector2);
^

Visual Studio Version

No response

GCC / Compiler Version

No response

[hariharans29]

CC: Rohanjames1997

[Rohanjames1997]

Do we need to add CI that targets this platform too?

[edgchen1]

weidu-tpvision Thanks for reporting the issue.

Do we need to add CI that targets this platform too?

Rohanjames1997 We do have a packaging pipeline that builds for this Android ABI. It also had similar errors in a recent run.

[Rohanjames1997]

Interesting, is the packaging pipeline only visible internally? If not, could you link it here too please?

[weidu-tpvision]

Perfect, and thanks! I feel that I could fix it myself!

[edgchen1]

Interesting, is the packaging pipeline only visible internally? If not, could you link it here too please?

Unfortunately, it is only visible internally.