Re: protobuf on NetBSD 9

[Greg Troxel <gdt%lexort.com@localhost>]

Stephen Borrill <netbsd%precedence.co.uk@localhost> writes:

> I am trying to build protobuf on NetBSD 9 from pkgsrc-2026Q2 and have
> noted the comments in its Makefile about building with GCC 10 (and it
> did build on NetBSD 10).

I am pretty sure that the comments are about a previous problem and you
have found a new problem.

> It correctly determines it require gcc10 (with gcc10-libs as a runtime
> dependency) to build, but still fails:

USE_CXX_FEATURES=c++17 leads to gcc10, is on plan.

> In file included from /usr/pkg/gcc10/include/c++/ext/string_conversions.h:43,
>                  from /usr/pkg/gcc10/include/c++/bits/basic_string.h:6557,
>                  from /usr/pkg/gcc10/include/c++/string:55,
>                  from /usr/pkg/gcc10/include/c++/bits/locale_classes.h:40,
>                  from /usr/pkg/gcc10/include/c++/bits/ios_base.h:41,
>                  from /usr/pkg/gcc10/include/c++/ios:42,
>                  from /usr/pkg/gcc10/include/c++/istream:38,
>                  from /pkg_comp/obj/pkgsrc/devel/protobuf/default/protobuf-35.1/src/google/protobuf/io/zero_copy_stream_impl.cc:24:
> /usr/pkg/gcc10/include/c++/cstdio:176:11: error: 'vfscanf' has not been declared in '::'
>   176 |   using ::vfscanf;
>       |           ^~~~~~~
> /usr/pkg/gcc10/include/c++/cstdio:177:11: error: 'vscanf' has not been declared in '::'
>   177 |   using ::vscanf;
>       |           ^~~~~~
> /usr/pkg/gcc10/include/c++/cstdio:179:11: error: 'vsscanf' has not been declared in '::'
>   179 |   using ::vsscanf;
>       |           ^~~~~~~
> /usr/pkg/gcc10/include/c++/cstdio:186:22: error: 'vfscanf' has not been declared in '__gnu_cxx'
>   186 |   using ::__gnu_cxx::vfscanf;
>       |                      ^~~~~~~
> /usr/pkg/gcc10/include/c++/cstdio:187:22: error: 'vscanf' has not been declared in '__gnu_cxx'
>   187 |   using ::__gnu_cxx::vscanf;
>       |                      ^~~~~~
> /usr/pkg/gcc10/include/c++/cstdio:189:22: error: 'vsscanf' has not been declared in '__gnu_cxx'
>   189 |   using ::__gnu_cxx::vsscanf;
>       |                      ^~~~~~~

I have a not-100%-reliable memory that it is up to the compiler whether
or to require std::foo vs accepting foo, in cases when the standard says
std::foo.  This feels like a similar situation/problem.

I can reproduce your errors, pretty up-to-date netbsd-9, 2026Q2.


The fix of course is to upgrade from 9, lest you be the last one
standing who cares about making things work on 9, which is increasingly
feeling like pushing a wet noodle uphill, as we are more than 6y since
release, likely 7y since branch, and even more since getting a new
compiler.  I personally have mostly given up on 9.