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Using USE_THREADS & NUM_THREADS while building openblas for win arm64 #214

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merged 2 commits into from
Oct 12, 2025
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Using USE_THREADS & NUM_THREADS while building openblas for win arm64 #214

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Using USE_THREADS & NUM_THREADS while building openblas for win arm64
Akash9824 Oct 10, 2025
e7c9f95
prefer flang from LLVM over visual studio's version
mattip Oct 12, 2025
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5 changes: 4 additions & 1 deletion tools/build_steps_win_arm64.bat
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Expand Up @@ -93,8 +93,11 @@ echo Setting up ARM64 Developer Command Prompt and running CMake...
:: Initialize VS ARM64 environment
for /f "usebackq tokens=*" %%i in (`"C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property installationPath`) do call "%%i\VC\Auxiliary\Build\vcvarsall.bat" arm64

:: Prefer LLVM flang
PATH=C:\Program Files\LLVM\bin;%PATH%

:: Run CMake and Ninja build
cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release -DTARGET=ARMV8 -DBUILD_SHARED_LIBS=ON -DARCH=arm64 ^
cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release -DUSE_THREADS=1 -DNUM_THREADS=24 -DTARGET=ARMV8 -DBUILD_SHARED_LIBS=ON -DARCH=arm64 ^
-DBINARY=%build_bits% -DCMAKE_SYSTEM_PROCESSOR=ARM64 -DCMAKE_C_COMPILER=clang-cl ^
-DCMAKE_Fortran_COMPILER=flang-new -DSYMBOLPREFIX="scipy_" -DLIBNAMEPREFIX="scipy_" %interface_flags%
if errorlevel 1 exit /b 1
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