Compiler warnings elimination

[Xottab-DUTY]

Starting from the creation of this task, #116 is a subtask of this task.

MSVC:

• [ ] MSBuild
  • [ ] Enable "warnings are errors" mode (is it possible?)
• [ ] Compiler
  • [x] Enable conformance mode
  • [x] Enable "warnings are errors" mode
  • [ ] Raise the warning level to 4
  • [x] Level 1
  • [x] Level 2
  • [ ] Level 3
  • [ ] Level 4
• [ ] Linker
  • [ ] Enable "warnings are errors" mode

GCC:

• CMake and make
  • [ ] Enable "warnings are errors" mode (is it possible?)
• [ ] Compiler
  • [x] Disable permissive mode
  • [ ] Maybe enable pedantic mode
  • [ ] Enable "warnings are errors" mode
  • [ ] Raise the warning level to 4
  • [ ] Level 1
  • [ ] Level 2
  • [ ] Level 3
  • [ ] Level 4
• [ ] Linker
  • [ ] Enable "warnings are errors" mode

For history:

• [ ] List all warnings elimination commits in this issue

Tools: PVS-Studio CppDepend (includes cppcheck, Clang-Tidy, Vera++) ReSharper C++ (includes Clang and Clang-Tidy check plus it's own analysis) Visual Assist (has it's own code inspection)

https://habr.com/ru/articles/75123/ https://habr.com/ru/companies/pvs-studio/articles/303664/

[Xottab-DUTY]

Some work: 64ab9ce005a56dd969e73b31677653d18f4ad319 5460f48ae5877d89e5921f53ad47a5a2a03463d1