does not build on Debian unstable

[Zugschlus]

Hi,

while trying to build on Debian unstable, I encountered the following build error:

cd /home/mh/packages/vzlogger/upstream/vzlogger/src && /usr/bin/c++ -DHAVE_CONFIG_HPP -I/home/mh/packages/vzlogger/upstream/vzlogger -I/home/mh/packages/vzlogger/upstream/vzlogger/include -W -Wall -Wextra -Werror -Wnon-virtual-dtor -Wno-system-headers -Winit-self -Wmissing-include-dirs -Wno-pragmas -Wredundant-decls -Wno-unused-parameter -std=c++11 -fpermissive -Wno-error=redundant-decls -Wno-ignored-qualifiers   -g3 -o CMakeFiles/vzlogger.dir/vzlogger.cpp.o -c /home/mh/packages/vzlogger/upstream/vzlogger/src/vzlogger.cpp
/home/mh/packages/vzlogger/upstream/vzlogger/src/vzlogger.cpp: In function ‘int main(int, char**)’:
/home/mh/packages/vzlogger/upstream/vzlogger/src/vzlogger.cpp:549:10: error: invalid conversion from ‘int (*)(void*, MHD_Connection*, const char*, const char*, const char*, const char*, size_t*, void**)’ {aka ‘int (*)(void*, MHD_Connection*, const char*, const char*, const char*, const char*, long unsigned int*, void**)’} to ‘MHD_AccessHandlerCallback’ {aka ‘MHD_Result (*)(void*, MHD_Connection*, const char*, const char*, const char*, const char*, long unsigned int*, void**)’} [-Werror=permissive]
  549 |          &handle_request, (void *)&mappings, MHD_OPTION_END);
      |          ^~~~~~~~~~~~~~~
      |          |
      |          int (*)(void*, MHD_Connection*, const char*, const char*, const char*, const char*, size_t*, void**) {aka int (*)(void*, MHD_Connection*, const char*, const char*, const char*, const char*, long unsigned int*, void**)}

(git clone, cd, cmake -DBUILD_TEST=off, make). The same procedure on Debian stable works fine. This is likely to be an issue with a part of the more modern toolchain that comes with Debian's development version.

Debian unstable is the package source for Debian testing, which is currently frozen to be released as the next Debian stable 'bullseye' this summer. This is the point when your users are likely to encounter this error.

Please consider digging and fixing this issue.

[r00t-]

i uploaded an MR with the the fix yesterday: #473