Cannot build on macos 15.0 (xcode 16.0)

[sorascode]

Tested versions

• Reproducible in master

System information

macos 15.0 - xcode 16.0

Issue description

When trying to build the project I get an error that 'cstdint' file is not found in core/typedefs.h :

./core/typedefs.h:45:10: fatal error: 'cstdint' file not found
   45 | #include <cstdint>
      |          ^~~~~~~~~

Steps to reproduce

build the project

Minimal reproduction project (MRP)

[fire]

What version of master did you test?

[sorascode]

Did some more testing now.
I've tried several version and they all fail.
I've tried:

• master (2e14492)
• 4.3 (6699ae7)
• 3.6 (de25845)

master and 4.3 both complain about cstdint, but 3.6 complains about atomic:

./core/safe_refcount.h:38:10: fatal error: 'atomic' file not found
   38 | #include <atomic>
      |          ^~~~~~~~

I think the issue must have something to do with scons not compiling with cpp or the right version of cpp.