Fix compatibility with older versions of VS #4271
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vitaut
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Dec 21, 2024
include/fmt/base.h
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| #ifdef _MSVC_STL_UPDATE | ||
| # define FMT_MSVC_STL_UPDATE _MSVC_STL_UPDATE | ||
| #elif defined(_MSC_VER) && _MSC_VER < 1912 // VS 15.5 | ||
| # define FMT_MSVC_STL_UPDATE _MSVC_LANG | ||
| #else | ||
| # define FMT_CPLUSPLUS __cplusplus | ||
| # define FMT_MSVC_STL_UPDATE 0 | ||
| #endif |
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Let's move this to ostream.h where it is used.
|
Also to clarify: |
To be precise, it has been supported since MSVC 19.12. Therefore, for versions from 19.00 to 19.12, use _MSVC_LANG instead. fmt has already declared that it does not support MSVC before version 19.00. Here are two version reference tables: _MSC_VER and _MSVC_STL_UPDATE. |
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In the previous PR, I mentioned that there were no compatibility issues, but I was wrong. I confused the versions of VS and MSVC. _MSVC_STL_UPDATE appeared later than the VS version that fmt promised to support. This PR will fix this issue.