Re: new module 'fenv'

[Bruno Haible]

Here's a doc addition, regarding a problem with MSVC, for which Gnulib
cannot provide a workaround:


2023-11-04  Bruno Haible  <bruno@clisp.org>

        fenv: Document an ABI break on MSVC.
        * doc/posix-headers/fenv.texi: Document why fegetround and fesetround
        are seemingly broken on MSVC.

diff --git a/doc/posix-headers/fenv.texi b/doc/posix-headers/fenv.texi
index 36c636d7db..25e306d579 100644
--- a/doc/posix-headers/fenv.texi
+++ b/doc/posix-headers/fenv.texi
@@ -14,4 +14,9 @@
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+On MSVC, the values of the rounding direction macros have changed:
+@c https://github.com/MicrosoftDocs/cpp-docs/issues/4796
+In MSVC 14, @code{FE_UPWARD} is 0x100 and @code{FE_DOWNWARD} is 0x200,
+whereas in MSVC 14.30, it's the opposite.
 @end itemize