Add missing long double functions to Cygwin

This patch adds the long double functions missing in newlib to Cygwin.
Apart from some self-written additions (exp10l, finite{f,l}, isinf{f,l},
isnan{f,l}, pow10l) the files are taken from the Mingw-w64 math lib.
Minor changes were required, e.g. substitue _WIN64 with __x86_64__ and
fixing __FLT_RPT_DOMAIN/__FLT_RPT_ERANGE for Cygwin.

Cygwin:
	* math: New subdir with math functions.
	* Makefile.in (VPATH): Add math subdir.
	(MATH_OFILES): List of object files collected from building files in
	math subdir.
	(DLL_OFILES): Add $(MATH_OFILES).
	${CURDIR}/libm.a: Add $(MATH_OFILES) to build.
	* common.din: Add new functions from math subdir.
	* i686.din: Align to new math subdir.  Remove functions now commonly
	available.
	* x86_64.din: Ditto.
	* math.h: math.h wrapper to define mingw structs used in some files in
	math subdir.
	* include/cygwin/version.h: Bump API minor version.

newlib:
	* libc/include/complex.h: Add prototypes for complex long double
	functions.  Only define for Cygwin.
	* libc/include/math.h: Additionally enable prototypes of long double
	functions for Cygwin.  Add Cygwin-only prototypes for dreml, sincosl,
	exp10l and pow10l.  Explain why we don't add them to newlib.
	* libc/include/tgmath.h: Enable long double handling on Cygwin.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

1 files changed, 100 insertions, 0 deletions

diff --git a/winsup/cygwin/math/cacosh.def.h b/winsup/cygwin/math/cacosh.def.h
new file mode 100644
index 000000000..f4ea2da07
--- /dev/null
+++ b/winsup/cygwin/math/cacosh.def.h
@@ -0,0 +1,100 @@
+/*
+ This Software is provided under the Zope Public License (ZPL) Version 2.1.
+
+ Copyright (c) 2009, 2010 by the mingw-w64 project
+
+ See the AUTHORS file for the list of contributors to the mingw-w64 project.
+
+ This license has been certified as open source. It has also been designated
+ as GPL compatible by the Free Software Foundation (FSF).
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+   1. Redistributions in source code must retain the accompanying copyright
+      notice, this list of conditions, and the following disclaimer.
+   2. Redistributions in binary form must reproduce the accompanying
+      copyright notice, this list of conditions, and the following disclaimer
+      in the documentation and/or other materials provided with the
+      distribution.
+   3. Names of the copyright holders must not be used to endorse or promote
+      products derived from this software without prior written permission
+      from the copyright holders.
+   4. The right to distribute this software or to use it for any purpose does
+      not give you the right to use Servicemarks (sm) or Trademarks (tm) of
+      the copyright holders.  Use of them is covered by separate agreement
+      with the copyright holders.
+   5. If any files are modified, you must cause the modified files to carry
+      prominent notices stating that you changed the files and the date of
+      any change.
+
+ Disclaimer
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED
+ OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
+ OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+__FLT_TYPE __complex__ __cdecl
+__FLT_ABI(cacosh) (__FLT_TYPE __complex__ z)
+{
+  __complex__ __FLT_TYPE ret;
+  __complex__ __FLT_TYPE x;
+  int r_class = fpclassify (__real__ z);
+  int i_class = fpclassify (__imag__ z);
+
+  if (i_class == FP_INFINITE)
+  {
+    __real__ ret = __FLT_HUGE_VAL;
+    __imag__ ret = (r_class == FP_NAN ? __FLT_NAN : __FLT_ABI(copysign) (
+      (r_class == FP_INFINITE ? (__real__ z < __FLT_CST(0.0) ? __FLT_PI_3_4 : __FLT_PI_4) : __FLT_PI_2), __imag__ z));
+    return ret;
+  }
+
+  if (r_class == FP_INFINITE)
+  {
+    __real__ ret = __FLT_HUGE_VAL;
+    __imag__ ret = ((i_class != FP_NAN && i_class != FP_INFINITE)
+      ? __FLT_ABI(copysign) (signbit (__real__ z) ? __FLT_PI : __FLT_CST(0.0), __imag__ z) : __FLT_NAN);
+    return ret;
+  }
+
+  if (r_class == FP_NAN || i_class == FP_NAN)
+  {
+    __real__ ret = __FLT_NAN;
+    __imag__ ret = __FLT_NAN;
+    return ret;
+  }
+
+  if (r_class == FP_ZERO && i_class == FP_ZERO)
+  {
+    __real__ ret = __FLT_CST(0.0);
+    __imag__ ret = __FLT_ABI(copysign) (__FLT_PI_2, __imag__ z);
+    return ret;
+  }
+
+  __real__ x = (__real__ z - __imag__ z) * (__real__ z + __imag__ z) - __FLT_CST(1.0);
+  __imag__ x = __FLT_CST(2.0) * __real__ z * __imag__ z;
+
+  x = __FLT_ABI(csqrt) (x);
+
+  if (__real__ z < __FLT_CST(0.0))
+    x = -x;
+
+  __real__ x += __real__ z;
+  __imag__ x += __imag__ z;
+
+  ret = __FLT_ABI(clog) (x);
+
+  if (__real__ ret < __FLT_CST(0.0))
+    ret = -ret;
+
+  return ret;
+}