2021Q1: net/libfilezilla not building on NetBSD/amd64 9.1_STABLE (16.02.2021)

[Matthias Petermann <mp%petermann-it.de@localhost>]

Hello all,

on a fresh NetBSD 9.1_STABLE with pkgsrc2021Q1 I fail to build 
libfilezilla. If it makes any difference - I use pbulk in a sandbox. I 
have tried both with MAKE_JOBS=8 and MAKE_JOBS=1 - the problem occurs in 
both cases.

```
/bin/sh ../libtool  --tag=CXX   --mode=compile c++ -std=c++17 
-DHAVE_CONFIG_H    -I../config -DBUILDING_LIBFILEZILLA 
-I/usr/pkg/include  -I/usr/pkg/include -I/usr/pkg/include/p11-kit-1  -I. 
-I./libfilezilla -I/usr/pkg/include -I/usr/include  -fvisibility=hidden 
-O2 -D_FORTIFY_SOURCE=2 -I/usr/pkg/include -I/usr/include -Wall -g -MT 
libfilezilla_la-invoker.lo -MD -MP -MF .deps/libfilezilla_la-invoker.Tpo 
-c -o libfilezilla_la-invoker.lo `test -f 'invoker.cpp' || echo 
'./'`invoker.cpp
libtool: compile:  c++ -std=c++17 -DHAVE_CONFIG_H -I../config 
-DBUILDING_LIBFILEZILLA -I/tmp/work/.buildlink/include 
-I/tmp/work/.buildlink/include/p11-kit-1 -I. -I./libfilezilla 
-fvisibility=hidden -O2 -D_FORTIFY_SOURCE=2 -Wall -g -MT 
libfilezilla_la-invoker.lo -MD -MP -MF .deps/libfilezilla_la-invoker.Tpo 
-c invoker.cpp  -fPIC -DPIC -o .libs/libfilezilla_la-invoker.o
invoker.cpp: In function 'fz::invoker_factory 
fz::get_invoker_factory(fz::event_loop&)':
invoker.cpp:28:54: error: 'loop' was not declared in this scope
  return [handler = std::optional<thread_invoker>(), 
&loop](std::function<void()> const& cb) mutable {
                                                      ^~~~
invoker.cpp: In lambda function:
invoker.cpp:30:20: error: 'loop' is not captured
    handler.emplace(loop);
                    ^~~~
invoker.cpp:28:58: note: the lambda has no capture-default
  return [handler = std::optional<thread_invoker>(), 
&loop](std::function<void()> const& cb) mutable {
                                                          ^
invoker.cpp:28:54: note: '<typeprefixerror>loop' declared here
  return [handler = std::optional<thread_invoker>(), 
&loop](std::function<void()> const& cb) mutable {
                                                      ^~~~
gmake[1]: *** [Makefile:768: libfilezilla_la-invoker.lo] Error 1
gmake[1]: Leaving directory '/tmp/work/libfilezilla-0.27.0/lib'
gmake: *** [Makefile:487: all-recursive] Error 1
*** Error code 2

Stop.
make[1]: stopped in /usr/pkgsrc/net/libfilezilla
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/net/libfilezilla
```

Is the problem already known? My Google search brought only relatively 
unspecific results related to Ubuntu[1] and GCC[2]. Accordingly, it 
seems to be a compiler problem that is fixed in GCC 8. However, NetBSD 
9.1 still uses GCC 7.5.0. Could this be the reason and is there a 
workaround? In pkgsrc there are already newer GCC versions in it - how 
can I test the PKG to force the use of GCC 8 from pkgsrc?

According to HG, the libfilezilla PKG was updated on 03/12/2021, and 
before that last updated on 09/18/2021. This could be the reason why the 
problem did not occur with the same build setup (and pkgsrc2020Q4) so far.

Kind regards
Matthias


[1] https://forum.filezilla-project.org/viewtopic.php?t=53305
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71546

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