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19 lines
927 B
19 lines
927 B
3 years ago
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## `c_std` and `cpp_std` options now accepts a list of values
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Projects that prefer GNU C, but can fallback to ISO C, can now set, for
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example, `default_options: 'c_std=gnu11,c11'`, and it will use `gnu11` when
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available, but fallback to `c11` otherwise. It is an error only if none of the
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values are supported by the current compiler.
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Likewise, a project that can take benefit of `c++17` but can still build with
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`c++11` can set `default_options: 'cpp_std=c++17,c++11'`.
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This allows us to deprecate `gnuXX` values from the MSVC compiler. That means
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that `default_options: 'c_std=gnu11'` will now print a warning with MSVC
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but fallback to `c11`. No warning is printed if at least one
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of the values is valid, i.e. `default_options: 'c_std=gnu11,c11'`.
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In the future that deprecation warning will become an hard error because
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`c_std=gnu11` should mean GNU is required, for projects that cannot be
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built with MSVC for example.
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