move to C++11

FaissException.h

@@ -27,9 +27,9 @@ class FaissException : public std::exception {
                  int line);
 
   /// from std::exception
-  virtual const char* what() const _GLIBCXX_USE_NOEXCEPT
+  const char* what() const noexcept override
   {  return msg.c_str(); }
-  virtual ~FaissException () _GLIBCXX_USE_NOEXCEPT {}
+  ~FaissException () noexcept override {}
 
   std::string msg;
 };

example_makefiles/makefile.inc.Linux

@@ -11,7 +11,7 @@
 
 CC=g++
 
-CFLAGS=-fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare -Dnullptr=NULL -Doverride= -fopenmp
+CFLAGS=-fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare -std=c++11 -fopenmp
 LDFLAGS=-g -fPIC  -fopenmp
 
 # common linux flags

example_makefiles/makefile.inc.Mac.brew

@@ -4,7 +4,7 @@
 # Tested on macOS Sierra (10.12.2) with llvm installed using Homebrew (https://brew.sh)
 # brew install llvm
 CC=/usr/local/opt/llvm/bin/clang++
-CFLAGS=-fPIC -m64 -Wall -g -O3 -msse4 -mpopcnt -fopenmp -Wno-sign-compare -Dnullptr=NULL -I/usr/local/opt/llvm/include -Doverride=
+CFLAGS=-fPIC -m64 -Wall -g -O3 -msse4 -mpopcnt -fopenmp -Wno-sign-compare -Dnullptr=NULL -I/usr/local/opt/llvm/include -std=c++11
 LDFLAGS=-g -fPIC -fopenmp -L/usr/local/opt/llvm/lib
 
 # common mac flags

example_makefiles/makefile.inc.Mac.port

@@ -9,7 +9,7 @@
 # port install g++-mp-6
 CC=/opt/local/bin/g++-mp-6
 
-CFLAGS=-fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare -Doverride=
+CFLAGS=-fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare -std=c++11
 LDFLAGS=-g -fPIC  -fopenmp