[libc++] Drop support for CRTs older than VS 2015

[smeenai]

Summary

LLVM dropped support for Visual Studio versions older than 2015 quite
some time ago, so I consider it safe to drop libc++'s support for older
CRTs. The CRT in Visual Studio 2015 provides a lot of previously missing
functions, so targeting it requires less special casing.

include/cmath

 using ::atanh;
 using ::atanhf;
 using ::cbrt;
 using ::cbrtf;
 
 using ::copysign;
 using ::copysignf;
 
-#if !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
 using ::erf;
 using ::erff;
 using ::erfc;
 using ::erfcf;
 using ::exp2;
 using ::exp2f;
 using ::expm1;
 using ::expm1f;

 using ::log2;
 using ::log2f;
 using ::logb;
 using ::logbf;
 using ::lrint;
 using ::lrintf;
 using ::lround;
 using ::lroundf;
-#endif // !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
 
 using ::nan;
 using ::nanf;
 
-#if !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
 using ::nearbyint;
 using ::nearbyintf;
 using ::nextafter;
 using ::nextafterf;
 using ::nexttoward;
 using ::nexttowardf;
 using ::remainder;
 using ::remainderf;
 using ::remquo;
 using ::remquof;
 using ::rint;
 using ::rintf;
 using ::round;
 using ::roundf;
 using ::scalbln;
 using ::scalblnf;
 using ::scalbn;
 using ::scalbnf;
 using ::tgamma;
 using ::tgammaf;
 using ::trunc;
 using ::truncf;
-#endif // !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
 
 using ::acosl;
 using ::asinl;
 using ::atanl;
 using ::atan2l;
 using ::ceill;
 using ::cosl;
 using ::coshl;

 using ::tanhl;
 using ::acoshl;
 using ::asinhl;
 using ::atanhl;
 using ::cbrtl;
 
 using ::copysignl;
 
-#if !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
 using ::erfl;
 using ::erfcl;
 using ::exp2l;
 using ::expm1l;
 using ::fdiml;
 using ::fmal;
 using ::fmaxl;
 using ::fminl;

 using ::remainderl;
 using ::remquol;
 using ::rintl;
 using ::roundl;
 using ::scalblnl;
 using ::scalbnl;
 using ::tgammal;
 using ::truncl;
-#endif // !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
 
 #if _LIBCPP_STD_VER > 14
 inline _LIBCPP_INLINE_VISIBILITY float       hypot(       float x,       float y,       float z ) { return sqrt(x*x + y*y + z*z); }
 inline _LIBCPP_INLINE_VISIBILITY double      hypot(      double x,      double y,      double z ) { return sqrt(x*x + y*y + z*z); }
 inline _LIBCPP_INLINE_VISIBILITY long double hypot( long double x, long double y, long double z ) { return sqrt(x*x + y*y + z*z); }
 
 template <class _A1, class _A2, class _A3>
 inline _LIBCPP_INLINE_VISIBILITY

include/cstdio

 int ferror(FILE* stream);
 void perror(const char* s);
 
 }  // std
 */
 
 #include <__config>
 #include <stdio.h>
-#if defined(_LIBCPP_MSVCRT)
-#include <crtversion.h>
-#endif
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 using ::FILE;

 using ::remove;
 using ::rename;
 using ::tmpfile;
 using ::tmpnam;
 #endif
 
 #ifndef _LIBCPP_HAS_NO_STDIN
 using ::getchar;
-#if _LIBCPP_STD_VER <= 11 && \
-    (!defined(_VC_CRT_MAJOR_VERSION) || _VC_CRT_MAJOR_VERSION < 14)
+#if _LIBCPP_STD_VER <= 11 && !defined(_LIBCPP_MSVCRT)
 using ::gets;
 #endif
 using ::scanf;
 using ::vscanf;
 #endif
 
 #ifndef _LIBCPP_HAS_NO_STDOUT
 using ::printf;
 using ::putchar;
 using ::puts;
 using ::vprintf;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif  // _LIBCPP_CSTDIO

include/math.h

 
 floating_point trunc (arithmetic x);
 float          truncf(float x);
 long double    truncl(long double x);
 
 */
 
 #include <__config>
-#if defined(_LIBCPP_MSVCRT)
-#include <crtversion.h>
-#endif
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
 
 #include_next <math.h>
 
 #ifdef __cplusplus

 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_arithmetic<_A1>::value, bool>::type
 signbit(_A1 __lcpp_x) _NOEXCEPT
 {
     return __libcpp_signbit((typename std::__promote<_A1>::type)__lcpp_x);
 }
 
-#elif defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) >= 14)
+#elif defined(_LIBCPP_MSVCRT)
 
 template <typename _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_arithmetic<_A1>::value, bool>::type
 signbit(_A1 __lcpp_x) _NOEXCEPT
 {
   return ::signbit(static_cast<typename std::__promote<_A1>::type>(__lcpp_x));
 }

 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_arithmetic<_A1>::value, int>::type
 fpclassify(_A1 __lcpp_x) _NOEXCEPT
 {
     return __libcpp_fpclassify((typename std::__promote<_A1>::type)__lcpp_x);
 }
 
-#elif defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) >= 14)
+#elif defined(_LIBCPP_MSVCRT)
 
 template <typename _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_arithmetic<_A1>::value, int>::type
 fpclassify(_A1 __lcpp_x) _NOEXCEPT
 {
   return ::fpclassify(static_cast<typename std::__promote<_A1>::type>(__lcpp_x));
 }

 
 inline _LIBCPP_INLINE_VISIBILITY
 long double
 abs(long double __lcpp_x) _NOEXCEPT {return ::fabsl(__lcpp_x);}
 #endif // !(defined(_AIX) || defined(__sun__))
 
 // acos
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       acos(float __lcpp_x) _NOEXCEPT       {return ::acosf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double acos(long double __lcpp_x) _NOEXCEPT {return ::acosl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 acos(_A1 __lcpp_x) _NOEXCEPT {return ::acos((double)__lcpp_x);}
 
 // asin
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       asin(float __lcpp_x) _NOEXCEPT       {return ::asinf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double asin(long double __lcpp_x) _NOEXCEPT {return ::asinl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 asin(_A1 __lcpp_x) _NOEXCEPT {return ::asin((double)__lcpp_x);}
 
 // atan
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       atan(float __lcpp_x) _NOEXCEPT       {return ::atanf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double atan(long double __lcpp_x) _NOEXCEPT {return ::atanl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 atan(_A1 __lcpp_x) _NOEXCEPT {return ::atan((double)__lcpp_x);}
 
 // atan2
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       atan2(float __lcpp_y, float __lcpp_x) _NOEXCEPT             {return ::atan2f(__lcpp_y, __lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double atan2(long double __lcpp_y, long double __lcpp_x) _NOEXCEPT {return ::atan2l(__lcpp_y, __lcpp_x);}
 #endif
 
 template <class _A1, class _A2>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::__lazy_enable_if
 <
     std::is_arithmetic<_A1>::value &&
     std::is_arithmetic<_A2>::value,
     std::__promote<_A1, _A2>
 >::type
 atan2(_A1 __lcpp_y, _A2 __lcpp_x) _NOEXCEPT
 {
     typedef typename std::__promote<_A1, _A2>::type __result_type;
     static_assert((!(std::is_same<_A1, __result_type>::value &&
                      std::is_same<_A2, __result_type>::value)), "");
     return ::atan2((__result_type)__lcpp_y, (__result_type)__lcpp_x);
 }
 
 // ceil
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       ceil(float __lcpp_x) _NOEXCEPT       {return ::ceilf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double ceil(long double __lcpp_x) _NOEXCEPT {return ::ceill(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 ceil(_A1 __lcpp_x) _NOEXCEPT {return ::ceil((double)__lcpp_x);}
 
 // cos
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       cos(float __lcpp_x) _NOEXCEPT       {return ::cosf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double cos(long double __lcpp_x) _NOEXCEPT {return ::cosl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 cos(_A1 __lcpp_x) _NOEXCEPT {return ::cos((double)__lcpp_x);}
 
 // cosh
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       cosh(float __lcpp_x) _NOEXCEPT       {return ::coshf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double cosh(long double __lcpp_x) _NOEXCEPT {return ::coshl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 cosh(_A1 __lcpp_x) _NOEXCEPT {return ::cosh((double)__lcpp_x);}
 
 // exp
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       exp(float __lcpp_x) _NOEXCEPT       {return ::expf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double exp(long double __lcpp_x) _NOEXCEPT {return ::expl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 exp(_A1 __lcpp_x) _NOEXCEPT {return ::exp((double)__lcpp_x);}
 
 // fabs
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       fabs(float __lcpp_x) _NOEXCEPT       {return ::fabsf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double fabs(long double __lcpp_x) _NOEXCEPT {return ::fabsl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 fabs(_A1 __lcpp_x) _NOEXCEPT {return ::fabs((double)__lcpp_x);}
 
 // floor
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       floor(float __lcpp_x) _NOEXCEPT       {return ::floorf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double floor(long double __lcpp_x) _NOEXCEPT {return ::floorl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 floor(_A1 __lcpp_x) _NOEXCEPT {return ::floor((double)__lcpp_x);}
 
 // fmod
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       fmod(float __lcpp_x, float __lcpp_y) _NOEXCEPT             {return ::fmodf(__lcpp_x, __lcpp_y);}
 inline _LIBCPP_INLINE_VISIBILITY long double fmod(long double __lcpp_x, long double __lcpp_y) _NOEXCEPT {return ::fmodl(__lcpp_x, __lcpp_y);}
 #endif
 
 template <class _A1, class _A2>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::__lazy_enable_if
 <
     std::is_arithmetic<_A1>::value &&
     std::is_arithmetic<_A2>::value,
     std::__promote<_A1, _A2>
 >::type
 fmod(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
     typedef typename std::__promote<_A1, _A2>::type __result_type;
     static_assert((!(std::is_same<_A1, __result_type>::value &&
                      std::is_same<_A2, __result_type>::value)), "");
     return ::fmod((__result_type)__lcpp_x, (__result_type)__lcpp_y);
 }
 
 // frexp
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       frexp(float __lcpp_x, int* __lcpp_e) _NOEXCEPT       {return ::frexpf(__lcpp_x, __lcpp_e);}
 inline _LIBCPP_INLINE_VISIBILITY long double frexp(long double __lcpp_x, int* __lcpp_e) _NOEXCEPT {return ::frexpl(__lcpp_x, __lcpp_e);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 frexp(_A1 __lcpp_x, int* __lcpp_e) _NOEXCEPT {return ::frexp((double)__lcpp_x, __lcpp_e);}
 
 // ldexp
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       ldexp(float __lcpp_x, int __lcpp_e) _NOEXCEPT       {return ::ldexpf(__lcpp_x, __lcpp_e);}
 inline _LIBCPP_INLINE_VISIBILITY long double ldexp(long double __lcpp_x, int __lcpp_e) _NOEXCEPT {return ::ldexpl(__lcpp_x, __lcpp_e);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 ldexp(_A1 __lcpp_x, int __lcpp_e) _NOEXCEPT {return ::ldexp((double)__lcpp_x, __lcpp_e);}
 
 // log
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       log(float __lcpp_x) _NOEXCEPT       {return ::logf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double log(long double __lcpp_x) _NOEXCEPT {return ::logl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 log(_A1 __lcpp_x) _NOEXCEPT {return ::log((double)__lcpp_x);}
 
 // log10
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       log10(float __lcpp_x) _NOEXCEPT       {return ::log10f(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double log10(long double __lcpp_x) _NOEXCEPT {return ::log10l(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 log10(_A1 __lcpp_x) _NOEXCEPT {return ::log10((double)__lcpp_x);}
 
 // modf
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       modf(float __lcpp_x, float* __lcpp_y) _NOEXCEPT             {return ::modff(__lcpp_x, __lcpp_y);}
 inline _LIBCPP_INLINE_VISIBILITY long double modf(long double __lcpp_x, long double* __lcpp_y) _NOEXCEPT {return ::modfl(__lcpp_x, __lcpp_y);}
 #endif
 
 // pow
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       pow(float __lcpp_x, float __lcpp_y) _NOEXCEPT             {return ::powf(__lcpp_x, __lcpp_y);}
 inline _LIBCPP_INLINE_VISIBILITY long double pow(long double __lcpp_x, long double __lcpp_y) _NOEXCEPT {return ::powl(__lcpp_x, __lcpp_y);}
 #endif
 
 template <class _A1, class _A2>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::__lazy_enable_if
 <
     std::is_arithmetic<_A1>::value &&
     std::is_arithmetic<_A2>::value,
     std::__promote<_A1, _A2>
 >::type
 pow(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
     typedef typename std::__promote<_A1, _A2>::type __result_type;
     static_assert((!(std::is_same<_A1, __result_type>::value &&
                      std::is_same<_A2, __result_type>::value)), "");
     return ::pow((__result_type)__lcpp_x, (__result_type)__lcpp_y);
 }
 
 // sin
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       sin(float __lcpp_x) _NOEXCEPT       {return ::sinf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double sin(long double __lcpp_x) _NOEXCEPT {return ::sinl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 sin(_A1 __lcpp_x) _NOEXCEPT {return ::sin((double)__lcpp_x);}
 
 // sinh
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       sinh(float __lcpp_x) _NOEXCEPT       {return ::sinhf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double sinh(long double __lcpp_x) _NOEXCEPT {return ::sinhl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 sinh(_A1 __lcpp_x) _NOEXCEPT {return ::sinh((double)__lcpp_x);}
 
 // sqrt
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       sqrt(float __lcpp_x) _NOEXCEPT       {return ::sqrtf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double sqrt(long double __lcpp_x) _NOEXCEPT {return ::sqrtl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 sqrt(_A1 __lcpp_x) _NOEXCEPT {return ::sqrt((double)__lcpp_x);}
 
 // tan
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       tan(float __lcpp_x) _NOEXCEPT       {return ::tanf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double tan(long double __lcpp_x) _NOEXCEPT {return ::tanl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 tan(_A1 __lcpp_x) _NOEXCEPT {return ::tan((double)__lcpp_x);}
 
 // tanh
 
-#if !((defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14) || defined(_AIX) || defined(__sun__))
+#if !(defined(_AIX) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       tanh(float __lcpp_x) _NOEXCEPT       {return ::tanhf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double tanh(long double __lcpp_x) _NOEXCEPT {return ::tanhl(__lcpp_x);}
 #endif
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 tanh(_A1 __lcpp_x) _NOEXCEPT {return ::tanh((double)__lcpp_x);}
 
 // acosh
 
-#if !(defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14)
 inline _LIBCPP_INLINE_VISIBILITY float       acosh(float __lcpp_x) _NOEXCEPT       {return ::acoshf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double acosh(long double __lcpp_x) _NOEXCEPT {return ::acoshl(__lcpp_x);}
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 acosh(_A1 __lcpp_x) _NOEXCEPT {return ::acosh((double)__lcpp_x);}
-#endif
 
 // asinh
 
-#if !(defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14)
 inline _LIBCPP_INLINE_VISIBILITY float       asinh(float __lcpp_x) _NOEXCEPT       {return ::asinhf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double asinh(long double __lcpp_x) _NOEXCEPT {return ::asinhl(__lcpp_x);}
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 asinh(_A1 __lcpp_x) _NOEXCEPT {return ::asinh((double)__lcpp_x);}
-#endif
 
 // atanh
 
-#if !(defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14)
 inline _LIBCPP_INLINE_VISIBILITY float       atanh(float __lcpp_x) _NOEXCEPT       {return ::atanhf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double atanh(long double __lcpp_x) _NOEXCEPT {return ::atanhl(__lcpp_x);}
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 atanh(_A1 __lcpp_x) _NOEXCEPT {return ::atanh((double)__lcpp_x);}
-#endif
 
 // cbrt
 
-#if !(defined(_LIBCPP_MSVCRT) && (_VC_CRT_MAJOR_VERSION-0) < 14)
 inline _LIBCPP_INLINE_VISIBILITY float       cbrt(float __lcpp_x) _NOEXCEPT       {return ::cbrtf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double cbrt(long double __lcpp_x) _NOEXCEPT {return ::cbrtl(__lcpp_x);}
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 cbrt(_A1 __lcpp_x) _NOEXCEPT {return ::cbrt((double)__lcpp_x);}
-#endif
 
 // copysign
 
-#if !defined(_VC_CRT_MAJOR_VERSION) || (_VC_CRT_MAJOR_VERSION < 12)
 inline _LIBCPP_INLINE_VISIBILITY float copysign(float __lcpp_x,
                                                 float __lcpp_y) _NOEXCEPT {
   return ::copysignf(__lcpp_x, __lcpp_y);
 }
 inline _LIBCPP_INLINE_VISIBILITY long double
 copysign(long double __lcpp_x, long double __lcpp_y) _NOEXCEPT {
   return ::copysignl(__lcpp_x, __lcpp_y);
 }
-#endif
 
 template <class _A1, class _A2>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::__lazy_enable_if
 <
     std::is_arithmetic<_A1>::value &&
     std::is_arithmetic<_A2>::value,
     std::__promote<_A1, _A2>
 >::type
 copysign(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
     typedef typename std::__promote<_A1, _A2>::type __result_type;
     static_assert((!(std::is_same<_A1, __result_type>::value &&
                      std::is_same<_A2, __result_type>::value)), "");
     return ::copysign((__result_type)__lcpp_x, (__result_type)__lcpp_y);
 }
 
-#if !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
-
 // erf
 
 inline _LIBCPP_INLINE_VISIBILITY float       erf(float __lcpp_x) _NOEXCEPT       {return ::erff(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double erf(long double __lcpp_x) _NOEXCEPT {return ::erfl(__lcpp_x);}
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type

 inline _LIBCPP_INLINE_VISIBILITY float       trunc(float __lcpp_x) _NOEXCEPT       {return ::truncf(__lcpp_x);}
 inline _LIBCPP_INLINE_VISIBILITY long double trunc(long double __lcpp_x) _NOEXCEPT {return ::truncl(__lcpp_x);}
 
 template <class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
 typename std::enable_if<std::is_integral<_A1>::value, double>::type
 trunc(_A1 __lcpp_x) _NOEXCEPT {return ::trunc((double)__lcpp_x);}
 
-#endif // !(defined(_LIBCPP_MSVCRT) && ((_VC_CRT_MAJOR_VERSION-0) < 14))
-
 } // extern "C++"
 
 #endif // __cplusplus
 
 #endif  // _LIBCPP_MATH_H

include/support/win32/locale_win32.h

 // -*- C++ -*-
 //===--------------------- support/win32/locale_win32.h -------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP_SUPPORT_WIN32_LOCALE_WIN32_H
 #define _LIBCPP_SUPPORT_WIN32_LOCALE_WIN32_H
 
-#include <crtversion.h>
-
-#if _VC_CRT_MAJOR_VERSION < 14
-// ctype mask table defined in msvcrt.dll
-extern "C" unsigned short __declspec(dllimport) _ctype[];
-#endif
-
 #include "support/win32/support.h"
 #include "support/win32/locale_mgmt_win32.h"
 #include <stdio.h>
 
 lconv *localeconv_l( locale_t loc );
 size_t mbrlen_l( const char *__restrict s, size_t n,
                  mbstate_t *__restrict ps, locale_t loc);
 size_t mbsrtowcs_l( wchar_t *__restrict dst, const char **__restrict src,

include/support/win32/support.h

 
 #include <wchar.h> // mbstate_t
 #include <cstdarg> // va_ macros
 // "builtins" not implemented here for Clang or GCC as they provide
 // implementations. Assuming required for elsewhere else, certainly MSVC.
 #if defined(_LIBCPP_COMPILER_MSVC)
 #include <intrin.h>
 #endif
-#if defined(_LIBCPP_MSVCRT)
-#include <crtversion.h>
-#endif
 #define swprintf _snwprintf
 #define vswprintf _vsnwprintf
 
 #ifndef NOMINMAX
 #define NOMINMAX
 #endif
 
 // The mingw headers already define these as static.
 #ifndef __MINGW32__
 extern "C" {
 
 int vasprintf(char **sptr, const char *__restrict fmt, va_list ap);
 int asprintf(char **sptr, const char *__restrict fmt, ...);
 size_t mbsnrtowcs(wchar_t *__restrict dst, const char **__restrict src,
                   size_t nmc, size_t len, mbstate_t *__restrict ps);
 size_t wcsnrtombs(char *__restrict dst, const wchar_t **__restrict src,
                   size_t nwc, size_t len, mbstate_t *__restrict ps);
 }
 #endif // __MINGW32__
 
-#if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
-#define snprintf _snprintf
-#define _Exit _exit
-#endif
-
 #if defined(_LIBCPP_COMPILER_MSVC)
 
 // Bit builtin's make these assumptions when calling _BitScanForward/Reverse
 // etc. These assumptions are expected to be true for Win32/Win64 which this
 // file supports.
 static_assert(sizeof(unsigned long long) == 8, "");
 static_assert(sizeof(unsigned long) == 4, "");
 static_assert(sizeof(unsigned int) == 4, "");

src/locale.cpp

#if defined(__APPLE__) || defined(__FreeBSD__)
     return _DefaultRuneLocale.__runetype;
 #elif defined(__NetBSD__)
     return _C_ctype_tab_ + 1;
 #elif defined(__GLIBC__)
     return _LIBCPP_GET_C_LOCALE->__ctype_b;
 #elif __sun__
     return __ctype_mask;
 #elif defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
-#if _VC_CRT_MAJOR_VERSION < 14
-    // This is assumed to be safe, which is a nonsense assumption because we're
-    // going to end up dereferencing it later...
-    return _ctype+1; // internal ctype mask table defined in msvcrt.dll
-#else
     return __pctype_func();
-#endif
 #elif defined(__EMSCRIPTEN__)
     return *__ctype_b_loc();
 #elif defined(_NEWLIB_VERSION)
     // Newlib has a 257-entry table in ctype_.c, where (char)0 starts at [1].
     return _ctype_ + 1;
 #elif defined(_AIX)
     return (const unsigned int *)__lc_ctype_ptr->obj->mask;
 #else

src/support/win32/locale_win32.cpp

 // -*- C++ -*-
 //===-------------------- support/win32/locale_win32.cpp ------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #include <locale>
 #include <cstdarg> // va_start, va_end
 #include <memory>
 #include <type_traits>
 
-#include <crtversion.h>
-
 typedef _VSTD::remove_pointer<locale_t>::type __locale_struct;
 typedef _VSTD::unique_ptr<__locale_struct, decltype(&uselocale)> __locale_raii;
 
 // FIXME: base currently unused. Needs manual work to construct the new locale
 locale_t newlocale( int mask, const char * locale, locale_t /*base*/ )
 {
     return _create_locale( mask, locale );
 }
 locale_t uselocale( locale_t newloc )
 {
     locale_t old_locale = _get_current_locale();
     if ( newloc == NULL )
         return old_locale;
     // uselocale sets the thread's locale by definition, so unconditionally use thread-local locale
     _configthreadlocale( _ENABLE_PER_THREAD_LOCALE );
     // uselocale sets all categories
-#if _VC_CRT_MAJOR_VERSION < 14
-    setlocale( LC_ALL, newloc->locinfo->lc_category[LC_ALL].locale );
-#endif
+    // disable setting locale on Windows temporarily because the structure is opaque (PR31516)
+    //setlocale( LC_ALL, newloc->locinfo->lc_category[LC_ALL].locale );
     // uselocale returns the old locale_t
     return old_locale;
 }
 lconv *localeconv_l( locale_t loc )
 {
     __locale_raii __current( uselocale(loc), uselocale );
     return localeconv();
 }