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meson/docs/markdown/snippets/cstd.md

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c_std and cpp_std options now accepts a list of values

Projects that prefer GNU C, but can fallback to ISO C, can now set, for example, default_options: 'c_std=gnu11,c11', and it will use gnu11 when available, but fallback to c11 otherwise. It is an error only if none of the values are supported by the current compiler.

Likewise, a project that can take benefit of c++17 but can still build with c++11 can set default_options: 'cpp_std=c++17,c++11'.

This allows us to deprecate gnuXX values from the MSVC compiler. That means that default_options: 'c_std=gnu11' will now print a warning with MSVC but fallback to c11. No warning is printed if at least one of the values is valid, i.e. default_options: 'c_std=gnu11,c11'.

In the future that deprecation warning will become an hard error because c_std=gnu11 should mean GNU is required, for projects that cannot be built with MSVC for example.