[Windows] Compile with MSVC on build system (64bit)

[guruz]

(todo)

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[guruz]

This was done by @jturcotte in #5182

We could bring out (as a test/PoC) 64-bit builds based on MSVC. "Just" need to find a way to integrate it nicely with Jenkins.

FYI @michaelstingl

@guruz What are the plans for building 64-bit for Windows?
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#5237 (comment)

[ma-schmid]

@guruz there is another customer with 600 k files that would benefit from a 64 bit win sync client.
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[jturcotte]

@CaptionF There were a few important improvements in 2.3 that allowed me to simulate a sync of 2 000 000 files (could theoretically go up to 3M but I didn't verify), could you ask them to test the 2.3.0 beta maybe?

[ogoffart]

Done in 2.5

[dschmidt]

Kind of :-D

We build the client in 64bit indeed, but we don't ship it - only the shell extensions....

[michaelstingl]

We build the client in 64bit indeed, but we don't ship it - only the shell extensions....

What would be necessary to to ship 64-bit?

[dschmidt]

@michaelstingl Mess with the MSI build scripts some more.