Per my comments in #124368, I also want to take a closer look at the Alpine/Musl (under ENSURE_PRIMARY_STACK_SIZE) implementation and probably suggest a change. That will be for another day/PR.

My main interest is to have this change so that the F# compiler doesn't run out of stack space while compiling fsharp repo during the .NET build on ppc64le and s390x (dotnet/fsharp#19286).

Should we consider just using getrlimit on coreclr/naot also on all unix platforms? macOS defaults to 8MB for main thread by default (from that value), but then 512kB for secondary threads - we currently override manually to 1.5MB, but maybe it makes sense to just use logic this everywhere (that way it's user-controllable, consistent across all .NET on Unix, etc.)? Thoughts @tmds @jkotas?

Should we consider just using getrlimit on coreclr/naot also on all unix platforms? macOS defaults to 8MB for main thread by default (from that value), but then 512kB for secondary threads - we currently override manually to 1.5MB, but maybe it makes sense to just use logic this everywhere

I am hesitant to bump the default stack sizes further. This was discussed before in #98007

@jkotas @akoeplinger I've made changed based on your feedback. Please take another look.

I've updated the title/description.

Thanks for reviewing and feedback @akoeplinger and @jkotas!