Fix for clang 1y with gcc lib

- add a workaround for a gcc issue in fisrt_include.
- --> make sure that the first include is :
either a triqs lib
or first_include

test/speed/pool.cpp

@@ -1,3 +1,4 @@
+#include <triqs/utility/first_include.hpp>
 #include <vector>
 #include <map>
 #include <boost/pool/pool_alloc.hpp>

triqs/mc_tools/mc_generic.hpp

@@ -20,6 +20,7 @@
  ******************************************************************************/
 #ifndef TRIQS_TOOLS_MC_GENERIC_H
 #define TRIQS_TOOLS_MC_GENERIC_H
+#include <triqs/utility/first_include.hpp>
 #include <math.h>
 #include <triqs/utility/timer.hpp>
 #include <triqs/utility/report_stream.hpp>

triqs/mc_tools/random_generator.hpp

@@ -1,4 +1,3 @@
-
 /*******************************************************************************
  *
  * TRIQS: a Toolbox for Research in Interacting Quantum Systems
@@ -22,7 +21,7 @@
 
 #ifndef POLYMORPH_RANDOM_GENERATOR_H
 #define POLYMORPH_RANDOM_GENERATOR_H
-
+#include <triqs/utility/first_include.hpp>
 #include <boost/scoped_ptr.hpp>
 #include "../utility/exceptions.hpp"
 #include "./generator.hpp"

triqs/utility/first_include.hpp

@@ -21,6 +21,12 @@
 #ifndef TRIQS_ARRAYS_FIRST_INCLUDE_PYTHON_H
 #define TRIQS_ARRAYS_FIRST_INCLUDE_PYTHON_H
 
+// clang but not libc++
+#if defined(__clang__) and !defined(_LIBCPP_VERSION)
+// workaround an error in gcc stdlib
+typedef long double max_align_t;
+#endif
+
 #ifdef TRIQS_BUILDING_LIBRARY
 #include <triqs_config.h>
 #else

triqs/utility/stack_trace.hpp

@@ -22,6 +22,7 @@
 
 #ifndef TRIQS_UTILITY_TRACE_H 
 #define TRIQS_UTILITY_TRACE_H
+#include <triqs/utility/first_include.hpp>
 #include <string>
 #include <sstream>