CVS commit: src/sys/sys

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sat May 25 13:44:48 UTC 2024

Modified Files:
        src/sys/sys: ucontext.h

Log Message:
ucontext.h: Expose __UCONTEXT_SIZE to userland.

But don't expose __CTASSERT(__UCONTEXT_SIZE == sizeof(ucontext_t)) to
userland.

- __UCONTEXT_SIZE will be needed soon by libc and signal trampolines
  in order to version ucontext so we can safely expand it with
  architecture extensions.

- __CTASSERT is not safe to use in header files in arbitrary
  compilation environments (although in the NetBSD kernel build it is
  safe).  Exposing the __CTASSERT in a header file used by userland
  appears to have the side effect of breaking the Firefox build in
  rustc, though the mechanism isn't entirely clear.

Firefox/rustc discussion here:
https://mail-index.netbsd.org/pkgsrc-users/2024/05/18/msg039578.html

Let's see if this makes a difference -- if it works, great; if not,
maybe it will help us to narrow down what's happening with rustc and
Firefox.


To generate a diff of this commit:
cvs rdiff -u -r1.23 -r1.24 src/sys/sys/ucontext.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.