More conservative check for <string_view> availability. #4
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has_include(<string_view>) does not imply that the header can be included and will work. The assumption fails on MSVC and libc++ [1, 2]. Conversely, checking that __cplusplus > 201402L is not sufficient on its own either, as the toolchain on Mac OS 10.12 passes that check but does not contain a <string_view> header. [1] https://crbug.com/759349 [2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79433
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has_include(<string_view>) does not imply that the header can be included and will work. The assumption fails on MSVC and libc++ [1, 2]. Conversely, checking that __cplusplus > 201402L is not sufficient on its own either, as the toolchain on Mac OS 10.12 passes that check but does not contain a <string_view> header.
[1] https://crbug.com/759349
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79433