From 0a79fd42f9bfcc4c14dd10b2bd834495ce938060 Mon Sep 17 00:00:00 2001
From: Olivier Juan <olivier.juan@gmail.com>
Date: Fri, 14 Sep 2018 16:05:49 +0200
Subject: [PATCH] fix compilation on older g++ using enum instead of constexpr

---
 libeft.hxx | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/libeft.hxx b/libeft.hxx
index 8ce86ea..9d430af 100644
--- a/libeft.hxx
+++ b/libeft.hxx
@@ -169,13 +169,17 @@ private:
 // ** Split
 
 // Splitting factor used by split
-template<class Real> constexpr const Real splitFactor = 0. / 0.; // NaN
+template<class Real> struct splitFactor {};
 
 // Double precision:  ((2^27)+1), where 27 = sup(53/2)
-template<> constexpr const double splitFactor<double> = 134217729;
+template<> struct splitFactor<double> {
+  enum { value = 134217729 };
+};
 
 // Single precision:  ((2^12)+1), where 12 = 24/2
-template<> constexpr const float splitFactor<float> = 4097;
+template<> struct splitFactor<float> {
+  enum { value = 4097 };
+};
 
 // a = x + y
 // x = hi(a)
@@ -185,7 +189,7 @@ static inline void split(const Intrinsic<Real>& ia, Intrinsic<Real>& ix, Intrins
   typedef const Intrinsic<Real> I;
 
   stopInstr();
-  I ic = I(EFT::splitFactor<Real>) * ia;
+  I ic = I(EFT::splitFactor<Real>::value) * ia;
   ix = ic - (ic-ia);
   iy = ia - ix;
   startInstr();