Generate CMake configuration file about tomlplusplus HOT 5 CLOSED

Hi @marzer, If it's ok for you I can propose a PR with the solution described by @traversaro in #20 (comment)

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@traversaro @GiulioRomualdi I've just done some minor cleanup to move the cmake stuff behind a configuration option GENERATE_CMAKE_CONFIG that defaults to auto (disabled when invoked as a submodule, enabled otherwise). It should still 'just work', but if you want to be explicit about it you can when you invoke meson, e.g.:

CXX=clang++ meson build-clang -DGENERATE_CMAKE_CONFIG=enabled

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Ah, thanks @traversaro. Since I'm largely a cmake novice this may take me a while to dig into, so if you do decide to work on this yourself I'd be very grateful!

An alternative short-term workaround is to eliminate the need for build systems and subprojects completely by dropping the single-file version of the library toml.hpp in your source tree.

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On an unrelated note, I just had a look at the linked issue and noticed that my use of <charconv> is problematic for you guys. Since I'm already forced to use stringstreams on some platforms, there's no significant reason why I can't add support for an entirely stringstream-based mode, if that's helpful.

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Yup, go for it! I'm going to push a fix for the <charconv> issue and the locale issue later today, so I won't merge anything in until after that, but if it's just build configuration stuff I'm sure it'll be fairly simple to merge.

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