Re: [PATCH] Define GNULIB_NAMESPACE in unittests/string_view-selftests.c

[Joel Brobecker <brobecker@adacore.com>]

> > What worries me is that I don't see what's preventing us from hitting
> > that issue outside of the unittests code? We know we can adjust our
> > own classes, but this problem occured with a system class, so we had
> > no choice but to use GNULIB_NAMESPACE. I worry that the transition
> > from no GNULIB_NAMESPACE to using GNULIB_NAMESPACE in a given unit
> > will leave some C system calls that should normally be covered by
> > gnulib silently now reverting to the system (buggy) version.
> 
> Actually, gnulib seems to poison the function it replaces, so we won't be
> able to use it by mistake.  Let's say I add a "close" call:
> 
>   CXX    unittests/string_view-selftests.o
> /home/emaisin/src/binutils-gdb/gdb/unittests/string_view-selftests.c: In function ‘void selftests::string_view::run_tests()’:
> /home/emaisin/src/binutils-gdb/gdb/unittests/string_view-selftests.c:169:12: error: call to ‘close’ declared with attribute warning: The symbol ::close refers to the system function. Use gnulib::close instead. [-Werror]
>    close (0);
>             ^
> 
> And since we can enable GNULIB_NAMESPACE per compilation unit, we can
> do it progressively.  Once we are done, we can remove all those
> GNULIB_NAMESPACE defines and have a single one in common-defs.h, just
> before including gnulib.

Aha! This completely reassures me. Thanks!

-- 
Joel