* Paul Eggert: > diff --git a/NEWS b/NEWS > index 20dbc173..4ba8f3fe 100644 > --- a/NEWS > +++ b/NEWS > @@ -16,6 +16,10 @@ GNU Autoconf NEWS - User visible changes. > C11 and later. Programs can use AC_C_VARARRAYS and __STDC_NO_VLA__ > to use VLAs if available. > > +*** AC_PROG_CXX now prefers C++23, C++20, C++17, C++14 if available. > + Older code may need to be updated, as some older features of C++ are > + removed in later standards. > + Does this turn on experimental language modes by default? That's probably not what we want. It would be better to have an option to raise the C++ mode to at least a certain revision, and otherwise use the default. The default is more likely to be supported by system libraries, and it's a bit less likely that programmers use experimental, known-to-be-buggy features (language and library) by accident. Thanks, Florian
