Import libc++ trunk r165949. Among other improvements and bug fixes,

this has many visibility problems fixed, which should help with
compiling certain ports that exercise C++11 mode (i.e. Firefox).

Also, belatedly add the LICENSE.TXT and accompanying CREDITS.TXT files,
which are referred to in all the source files.

MFC after:	1 month

1 files changed, 26 insertions, 22 deletions

diff --git a/contrib/libc++/include/complex b/contrib/libc++/include/complex
index 3b660a3..6f88152 100644
--- a/contrib/libc++/include/complex
+++ b/contrib/libc++/include/complex
@@ -330,13 +330,13 @@ class _LIBCPP_VISIBLE complex<float>
 public:
     typedef float value_type;
 
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY complex(float __re = 0.0f, float __im = 0.0f)
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR complex(float __re = 0.0f, float __im = 0.0f)
         : __re_(__re), __im_(__im) {}
-    explicit /*constexpr*/ complex(const complex<double>& __c);
-    explicit /*constexpr*/ complex(const complex<long double>& __c);
+    explicit _LIBCPP_CONSTEXPR complex(const complex<double>& __c);
+    explicit _LIBCPP_CONSTEXPR complex(const complex<long double>& __c);
 
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY float real() const {return __re_;}
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY float imag() const {return __im_;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR float real() const {return __re_;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR float imag() const {return __im_;}
 
     _LIBCPP_INLINE_VISIBILITY void real(value_type __re) {__re_ = __re;}
     _LIBCPP_INLINE_VISIBILITY void imag(value_type __im) {__im_ = __im;}
@@ -386,13 +386,13 @@ class _LIBCPP_VISIBLE complex<double>
 public:
     typedef double value_type;
 
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY complex(double __re = 0.0, double __im = 0.0)
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR complex(double __re = 0.0, double __im = 0.0)
         : __re_(__re), __im_(__im) {}
-    /*constexpr*/ complex(const complex<float>& __c);
-    explicit /*constexpr*/ complex(const complex<long double>& __c);
+    _LIBCPP_CONSTEXPR complex(const complex<float>& __c);
+    explicit _LIBCPP_CONSTEXPR complex(const complex<long double>& __c);
 
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY double real() const {return __re_;}
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY double imag() const {return __im_;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR double real() const {return __re_;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR double imag() const {return __im_;}
 
     _LIBCPP_INLINE_VISIBILITY void real(value_type __re) {__re_ = __re;}
     _LIBCPP_INLINE_VISIBILITY void imag(value_type __im) {__im_ = __im;}
@@ -442,13 +442,13 @@ class _LIBCPP_VISIBLE complex<long double>
 public:
     typedef long double value_type;
 
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY complex(long double __re = 0.0L, long double __im = 0.0L)
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR complex(long double __re = 0.0L, long double __im = 0.0L)
         : __re_(__re), __im_(__im) {}
-    /*constexpr*/ complex(const complex<float>& __c);
-    /*constexpr*/ complex(const complex<double>& __c);
+    _LIBCPP_CONSTEXPR complex(const complex<float>& __c);
+    _LIBCPP_CONSTEXPR complex(const complex<double>& __c);
 
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY long double real() const {return __re_;}
-    /*constexpr*/ _LIBCPP_INLINE_VISIBILITY long double imag() const {return __im_;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR long double real() const {return __re_;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR long double imag() const {return __im_;}
 
     _LIBCPP_INLINE_VISIBILITY void real(value_type __re) {__re_ = __re;}
     _LIBCPP_INLINE_VISIBILITY void imag(value_type __im) {__im_ = __im;}
@@ -490,33 +490,33 @@ public:
         }
 };
 
-//constexpr
 inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_CONSTEXPR
 complex<float>::complex(const complex<double>& __c)
     : __re_(__c.real()), __im_(__c.imag()) {}
 
-//constexpr
 inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_CONSTEXPR
 complex<float>::complex(const complex<long double>& __c)
     : __re_(__c.real()), __im_(__c.imag()) {}
 
-//constexpr
 inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_CONSTEXPR
 complex<double>::complex(const complex<float>& __c)
     : __re_(__c.real()), __im_(__c.imag()) {}
 
-//constexpr
 inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_CONSTEXPR
 complex<double>::complex(const complex<long double>& __c)
     : __re_(__c.real()), __im_(__c.imag()) {}
 
-//constexpr
 inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_CONSTEXPR
 complex<long double>::complex(const complex<float>& __c)
     : __re_(__c.real()), __im_(__c.imag()) {}
 
-//constexpr
 inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_CONSTEXPR
 complex<long double>::complex(const complex<double>& __c)
     : __re_(__c.real()), __im_(__c.imag()) {}
 
@@ -1351,7 +1351,11 @@ tanh(const complex<_Tp>& __x)
     _Tp __2r(_Tp(2) * __x.real());
     _Tp __2i(_Tp(2) * __x.imag());
     _Tp __d(cosh(__2r) + cos(__2i));
-    return  complex<_Tp>(sinh(__2r)/__d, sin(__2i)/__d);
+    _Tp __2rsh(sinh(__2r));
+    if (isinf(__2rsh) && isinf(__d))
+        return complex<_Tp>(__2rsh > _Tp(0) ? _Tp(1) : _Tp(-1),
+                            __2i > _Tp(0) ? _Tp(0) : _Tp(-0.));
+    return  complex<_Tp>(__2rsh/__d, sin(__2i)/__d);
 }
 
 // asin