use prebuilt magma binary on windows (from PyTorch)

make-bin.bat

rem update blas dir and cuda version
set BLAS_DIR=D:\Programs\OpenBLAS-0.3.7-x64
set CUDA_PREFIX=cuda100

set OUTPUT_EXE=build\main

set MAGMA_DIR=%~dp0\build\magma
if not exist %MAGMA_DIR% (
    rem using static library precompiled for pytorch
    rem https://github.com/pytorch/pytorch/blob/master/docs/source/notes/windows.rst
    rem Make sure you have 7z and curl installed.
    curl -k https://s3.amazonaws.com/ossci-windows/magma_2.5.0_%CUDA_PREFIX%_release.7z -o build/magma.7z
    7z x -aoa build/magma.7z -obuild/magma
)

nvcc main.c -o %OUTPUT_EXE% ^
    -I%MAGMA_DIR%\include ^
    -L%BLAS_DIR%\lib -L%MAGMA_DIR%\lib ^
    -lcusparse -lcublas -lmagma -lmagma_sparse -llibopenblas ^
    -Xcompiler /MD

%OUTPUT_EXE%