[chqrlie]

• fix sizeof, countof and offsetof type as usize instead of u32
• force builtin expression type in variable argument expressions
• add shell scripts to extract C compiler diagnostics
• fix compiler warnings on macOS (signed/unsigned comparisons and such)

[bvdberg]

It indeed removes all the C build warnings on my system as well.

When I do 'make clean; make' I see a warning:

grep: output/*/cgen/build.log: No such file or directory

What I dont like is that:

u32 total = sizeof(X) + 10;

gives a conversion error. Sizeof(X) is a compile-time constant, so can just be the smallest thing it can be. It could even be u8 if needed. Having to cast all these things to some smaller type is nasty...

[chqrlie]

It indeed removes all the C build warnings on my system as well.

I also fixed in bug in the OpenBSD build, there was a redundant extern keyword

When I do 'make clean; make' I see a warning:

grep: output/*/cgen/build.log: No such file or directory

I do not get this warning, maybe a different version of make, but I changed the Makefile so this cannot happen.

What I dont like is that:

u32 total = sizeof(X) + 10;

gives a conversion error. Sizeof(X) is a compile-time constant, so can just be the smallest thing it can be. It could even be u8 if needed. Having to cast all these things to some smaller type is nasty...

I do not get a conversion error for this code fragment. I even added a test case for it.

[chqrlie]

I split the sizeof fix out from this commit into a separate PR sizeof.
This should make it easier to merge this one.