Ping: patches required for --enable-build-with-cxx

[Joern Rennecke]

Quoting Paolo Bonzini <bonzini@gnu.org>:

> Why can't you simply use AC_SYSTEM_EXTENSIONS in libiberty's configure
> script, so that _GNU_SOURCE is defined by GCC as well?

That would only work if every program that uses libiberty uses
AC_SYSTEM_EXTENSIONS .

We configure & build libiberty once, and then proceed to use its
headers for different programs, some of which are _GNU_SOURCE,
some of which are not.