Use Windows' _aligned_malloc paired with _aligned_free for MinGW

[albinahlback]

Currently cross-compiling with MinGW (in my case from Linux to Windows) generates an error due to line 131 in kernel/kalloc.c. I am no expert in MinGW, but I suppose one would actually utilize the same case as for MSVC at line 106.

This works for my setup at least. Perhaps there are cases where this won't work?

[stevengj]

On MinGW you should configure with the flag --with-our-malloc (which is effectively equivalent to _aligned_malloc), similar to https://github.com/FFTW/fftw3/blob/master/support/BUILD-MINGW64.sh

[stevengj]

But I guess we could try to automatically use _aligned_malloc on MinGW now that they provide this function. (They didn't used to IIRC.)

[albinahlback]

But I guess we could try to automatically use _aligned_malloc on MinGW now that they provide this function. (They didn't used to IIRC.)

Looking at an answer on StackOverflow, it seems like MinGW has provided _aligned_malloc since at least 2016. Perhaps the best way is to check whether _aligned_alloc is available during the configuration for Windows-type machines?

[stevengj]

Or we could check for _mm_malloc and _mm_free, since it sounds like those are supported even more widely.