Use the new MSVC preprocessor #1734
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Perhaps the we should enabling the new code based on _MSVC_TRADITIONAL? |
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Is this really necessary? this appears to only effect internal test headers, not public API headers, So I don't think this should fix any bugs related to using cpprest and the new preprocessor at the same time. |
barcharcraz
approved these changes
Dec 7, 2022
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MSVC has a new preprocessor (https://devblogs.microsoft.com/cppblog/announcing-full-support-for-a-c-c-conformant-preprocessor-in-msvc/). To compile code with MSVC and C++20 we need to use the new preprocessor (
/Zc:preprocessor).This change updates cpprestsdk to use
/Zc:preprocessoron versions of MSVC that support it (>= 16.6, which is _MSC_VER 1926).Without code changes,
/Zc:preprocessorcauses build breaks due to empty__VA_ARGS__in the macros defined in CheckMacros.h and TestMacros.h. Those headers already have versions of the macros that use the conformant##__VA_ARGS__syntax for non-MSVC compilers, so this change uses those existing macros for MSVC as well, on versions of MSVC that support/Zc:preprocessor.