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Eigen: Fix MSVC C++17 language standard detection logic

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To detect C++17 support, use _MSVC_LANG macro instead of _MSC_VER. _MSC_VER can indicate whether the current compiler version could support the C++17 language standard, but not whether that standard is actually selected (i.e. via /std:c++17).
See these web pages for more details:
https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
This commit is contained in:
Scott Ramsby 2019-05-03 14:14:09 -07:00
parent e9f0eb8a5e
commit ff06ef7584
1 changed files with 15 additions and 2 deletions
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17
Eigen/src/Core/util/Macros.h
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@ -109,7 +109,7 @@
#endif
// For the record, here is a table summarizing the possible values for EIGEN_COMP_MSVC:
// name ver MSC_VER
// name ver MSC_VER
// 2008 9 1500
// 2010 10 1600
// 2012 11 1700
@ -122,6 +122,19 @@
// 2017-14.13 15.6 1913
// 2017-14.14 15.7 1914
/// \internal EIGEN_COMP_MSVC_LANG set to _MSVC_LANG if the compiler is Microsoft Visual C++, 0 otherwise.
#if defined(_MSVC_LANG)
#define EIGEN_COMP_MSVC_LANG _MSVC_LANG
#else
#define EIGEN_COMP_MSVC_LANG 0
#endif
// For the record, here is a table summarizing the possible values for EIGEN_COMP_MSVC_LANG:
// MSVC option Standard MSVC_LANG
// /std:c++14 (default as of VS 2019) C++14 201402L
// /std:c++17 C++17 201703L
// /std:c++latest >C++17 >201703L
/// \internal EIGEN_COMP_MSVC_STRICT set to 1 if the compiler is really Microsoft Visual C++ and not ,e.g., ICC or clang-cl
#if EIGEN_COMP_MSVC && !(EIGEN_COMP_ICC || EIGEN_COMP_LLVM || EIGEN_COMP_CLANG)
#define EIGEN_COMP_MSVC_STRICT _MSC_VER
@ -512,7 +525,7 @@
// The macro EIGEN_COMP_CXXVER defines the c++ verson expected by the compiler.
// For instance, if compiling with gcc and -std=c++17, then EIGEN_COMP_CXXVER
// is defined to 17.
#if (defined(__cplusplus) && (__cplusplus > 201402L) || EIGEN_COMP_MSVC >= 1914)
#if (defined(__cplusplus) && (__cplusplus > 201402L) || EIGEN_COMP_MSVC_LANG > 201402L)
#define EIGEN_COMP_CXXVER 17
#elif (defined(__cplusplus) && (__cplusplus > 201103L) || EIGEN_COMP_MSVC >= 1910)
#define EIGEN_COMP_CXXVER 14