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find_package(cxxopts 1.2.0 REQUIRED)

cxxopts 1.2.0 is incompatible with the usage of Options::parse in config-cpp.cpp.

cxxopts v1.2.0 has return type of void for Options::parse
v2.0.0 and up has return type of ParseResult for Options::parse, which is what config-cpp needs.

Candidate libraries for parsing .ini files

• https://github.com/mcmtroffaes/inipp (C++ header-only)

There is a stray jsonHandler.cpp in `src/Makefile' which makes it impossible to build without the JSON library available:

set (config-cpp_SRC
    config-cpp.cpp
    jsonHandler.cpp    <-----
    util.cpp
    value.cpp
    event.cpp
    notification.cpp
    filesystemEvent.cpp
    inotify.cpp
)

Candidate libraries for TOML support:

• https://github.com/ToruNiina/toml11 (C++11, header-only, TOML 1.0)
• https://github.com/marzer/tomlplusplus (C++17, header-only, TOML 1.0)

Older alternatives:

• https://github.com/skystrife/cpptoml (C++11, header-only, TOML 0.5)
• https://github.com/mayah/tinytoml (C++11, header-only, TOML 0.4)

cxxopts::OptionParseException deprecated in newest version of cxxopts
cuase the compiling error as follow:

config-cpp.cpp: In member function ‘bool ConfigCpp::ConfigCpp::ReadInConfig()’:
config-cpp.cpp:176:27: error: ‘OptionParseException’ in namespace ‘cxxopts’ does not name a type
  176 |         } catch (cxxopts::OptionParseException &e) {
      |                           ^~~~~~~~~~~~~~~~~~~~
config-cpp.cpp:178:39: error: ‘e’ was not declared in this scope
  178 |             std::cout << "Error: " << e.what() << "\n";
      |                                       ^
At global scope:
cc1plus: warning: unrecognized command line option ‘-Wno-predefined-identifier-outside-function’

The following should establish a default value provided that there is no subkey in the top-level dictionary for JSON or YAML.

config.SetDefault("key.subkey","value");