I had a patchset before to do just this. It was posted on this mailing list, but as far as I can tell it was never merged.

There is a little more than just what you describe, because CLN uses the least significant bits of pointers that would be zero due to alignment for other things.

On Fri, Feb 23, 2018 at 8:41 PM, Jan Rheinländer <jrheinlaender@gmx.de> wrote:

Hi,

I'm trying to create a win64 build of CLN. Most of the changes seem to
involve replacing "unsigned long" with "uintptr_t" since "long" is 32bit
in Win64.

To make these changes useable for the community (by way of a git
patch?), should I

a) just go ahead and change

b) put all the changes into a

#if defined(_M_AMD64)
<changed code>
#else
<original code>
#endif

I refer specifically to the "unsigned long" to "uintptr_t" changes, not
to all changes in general. Is there any danger in doing this change on
other platforms?

Best regards,

Jan Rheinländer

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