not longer 32-bit compatible

[fdopen]

containers doesn't compile any longer on 32-bit systems:

ocaml-containers/src/core/CCInt.ml

Lines 343 to 345 in 38d8fc2

	let b = b - ((b lsr 1) land 0x5555555555555555) in
	let b = (b land 0x3333333333333333) + ((b lsr 2) land 0x3333333333333333) in
	let b = (b + (b lsr 4)) land 0x0f0f0f0f0f0f0f0f in

# File "src/core/CCInt.ml", line 343, characters 30-48:
# 343 |   let b = b - ((b lsr 1) land 0x5555555555555555) in
# 
# Error: Integer literal exceeds the range of representable integers of type int

[c-cube]

Thank you, I will try to fix that shortly.

In the mean time, do you have any suggestion on how to get a local 32 bits toolchain on a 64 bits linux? And similarly, how to get 32 bits CI to avoid this kind of regressions?

[fdopen]

Locally: opam switch create 4.10.0+32bit
CI: Just also test Windows - it's a good idea anyway; e.g. with https://github.com/ocaml/ocaml-ci-scripts/blob/master/README-appveyor.md and a 32-bit switch like 4.10.0+mingw32c

[c-cube]

I could reproduce. I initially tried 4.08.1+32bit but it didn't compile, whereas 4.10 is ok.

[c-cube]

can you give a try to the wip-327 branch?

[fdopen]

the following command now succeeds under 32-bit switches:

opam pin add -n containers 'https://github.com/c-cube/ocaml-containers.git#wip-327'
opam install -t containers