From 72f47ffea0536ad5aa38bc5395d3eee959d8002c Mon Sep 17 00:00:00 2001
From: Adrien Destugues - PulkoMandy <pulkomandy@pulkomandy.tk>
Date: Sat, 27 Oct 2012 15:42:44 +0200
Subject: [PATCH] Add missing tan(), tanh() and log10() for std::complex. These
 are part of the C++ standard, I don't know how they went missing in our
 version. http://www.cplusplus.com/reference/std/complex/

They are needed to build MathGL library, and likely other stuff.
---
 legacy/gcc/libstdc++/std/complext.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/legacy/gcc/libstdc++/std/complext.h b/legacy/gcc/libstdc++/std/complext.h
index 6c55037bf9..0e70194780 100644
--- a/legacy/gcc/libstdc++/std/complext.h
+++ b/legacy/gcc/libstdc++/std/complext.h
@@ -311,7 +311,7 @@ operator != (_FLT x, const complex<_FLT>& y)
 }
 
 // Some targets don't provide a prototype for hypot when -ansi.
-extern "C" double hypot (double, double) __attribute__ ((const));
+//extern "C" double hypot (double, double) __attribute__ ((const));
 
 template <class _FLT> inline _FLT
 abs (const complex<_FLT>& x) __attribute__ ((const));
@@ -387,6 +387,22 @@ template <class _FLT> complex<_FLT>
 template <class _FLT> complex<_FLT>
   sqrt (const complex<_FLT>&) __attribute__ ((const));
 
+template <class _FLT> inline complex<_FLT>
+tan (const complex<_FLT>& x)
+{
+  return sin (x) / cos (x);
+}
+template <class _FLT> inline complex<_FLT>
+tanh (const complex<_FLT>& x)
+{
+  return sinh (x) / cosh (x);
+}
+template <class _FLT> inline complex<_FLT>
+log10 (const complex<_FLT>& x)
+{
+  return log (x) / log (10.0);
+}
+
 template <class _FLT> istream& operator >> (istream&, complex<_FLT>&);
 template <class _FLT> ostream& operator << (ostream&, const complex<_FLT>&);
 } // extern "C++"