diff --git a/test/speed/array2.cpp b/test/speed/array2.cpp
index b0226b5e..1759926b 100644
--- a/test/speed/array2.cpp
+++ b/test/speed/array2.cpp
@@ -50,7 +50,7 @@ struct expression_template {
 
   MM B(A), C(A), D(A);
 
-  auto ex =  B + 3* C+ D;
+  //auto ex =  B + 3* C+ D;
   for (int u =0; u<5000; ++u)
     A = B + 3*C + D;
  }
@@ -84,7 +84,7 @@ struct expression_template_big {
 
   MM B(A), C(A), D(A);
 
-  auto ex =  B + 3* C+ D;
+  //auto ex =  B + 3* C+ D;
   for (int u =0; u<500; ++u)
     A = B + 3*C + D;
  }
diff --git a/test/triqs/arrays/array_algebra.cpp b/test/triqs/arrays/array_algebra.cpp
index d6816cf8..21e0c4a2 100644
--- a/test/triqs/arrays/array_algebra.cpp
+++ b/test/triqs/arrays/array_algebra.cpp
@@ -43,6 +43,7 @@ int main() {
 
 
  auto x  = A + B + 2*A;
+ std::cerr << x << std::endl;
 
   C =  A+2*A+3*A - 2*A+A -A+A+A*3+A+A+A+A+A+A+A+A+A+A+A+A+A; 
  std::cout  << C << std::endl ; 
diff --git a/test/triqs/arrays/const_view.cpp b/test/triqs/arrays/const_view.cpp
index fcc715dd..c18a56bd 100644
--- a/test/triqs/arrays/const_view.cpp
+++ b/test/triqs/arrays/const_view.cpp
@@ -36,7 +36,6 @@ int main(int argc, char **argv) {
  {
   array<long, 2> A(2, 3);
   A() = 3;
-  auto const &AA = A;
   f2(A());
 
 
diff --git a/test/triqs/det_manip/det_manip1.cpp b/test/triqs/det_manip/det_manip1.cpp
index 6bc2a26a..2221fd59 100644
--- a/test/triqs/det_manip/det_manip1.cpp
+++ b/test/triqs/det_manip/det_manip1.cpp
@@ -63,7 +63,6 @@ struct test {
    std::cerr<<" ------------------------------------------------"<<std::endl;
    std::cerr <<" i = "<< i << " size = "<< D.size() << std::endl; 
    // choose a move
-   int mn = RNG(4);
    size_t s = D.size();
    size_t i0,j0,i1,j1;
    det_old = D.determinant();
diff --git a/test/triqs/det_manip/det_manip2.cpp b/test/triqs/det_manip/det_manip2.cpp
index 4a0bae97..16500367 100644
--- a/test/triqs/det_manip/det_manip2.cpp
+++ b/test/triqs/det_manip/det_manip2.cpp
@@ -47,12 +47,11 @@ struct test {
    std::cerr<<" ------------------------------------------------"<<std::endl;
    std::cerr <<" i = "<< i << " size = "<< D.size() << std::endl; 
    // choose a move
-   int mn = RNG(4);
    size_t s = D.size();
    size_t w,w1;
    det_old = D.determinant();
    detratio =1;
-   double x,y,x1; 
+   double x,x1; 
 
    switch(RNG(( i>10 ? 4 : 1))) {
     case 0 :
diff --git a/test/triqs/det_manip/det_manipc1.cpp b/test/triqs/det_manip/det_manipc1.cpp
index e23e5e06..ff7a2a1f 100644
--- a/test/triqs/det_manip/det_manipc1.cpp
+++ b/test/triqs/det_manip/det_manipc1.cpp
@@ -65,7 +65,6 @@ struct test {
    std::cerr<<" ------------------------------------------------"<<std::endl;
    std::cerr <<" i = "<< i << " size = "<< D.size() << std::endl; 
    // choose a move
-   int mn = RNG(4);
    size_t s = D.size();
    size_t i0,j0,i1,j1;
    det_old = D.determinant();
diff --git a/test/triqs/det_manip/det_manipc2.cpp b/test/triqs/det_manip/det_manipc2.cpp
index 230df319..5b4340f1 100644
--- a/test/triqs/det_manip/det_manipc2.cpp
+++ b/test/triqs/det_manip/det_manipc2.cpp
@@ -66,7 +66,6 @@ struct test {
    std::cerr<<" ------------------------------------------------"<<std::endl;
    std::cerr <<" i = "<< i << " size = "<< D.size() << std::endl; 
    // choose a move
-   int mn = RNG(4);
    size_t s = D.size();
    size_t i0,j0,i1,j1;
    det_old = D.determinant();
diff --git a/test/triqs/gfs/curry1.cpp b/test/triqs/gfs/curry1.cpp
index 3a7dbe7c..054ae21d 100644
--- a/test/triqs/gfs/curry1.cpp
+++ b/test/triqs/gfs/curry1.cpp
@@ -10,7 +10,6 @@ int main() {
 
 try { 
 
- double precision=10e-9;
  double beta =1.;
   
  double tmin=0.;
diff --git a/test/triqs/gfs/curry_and_fourier.cpp b/test/triqs/gfs/curry_and_fourier.cpp
index 6755e62c..2e6ff0c3 100644
--- a/test/triqs/gfs/curry_and_fourier.cpp
+++ b/test/triqs/gfs/curry_and_fourier.cpp
@@ -13,13 +13,10 @@ using namespace triqs::gfs;
 int main() {
 
 try { 
- double beta =1.;
- double tmin=0.;
  double tmax=10;
  double wmin=0.;
  double wmax=1.0;
  int n_re_freq=100;
- int n_im_freq=100;
  int Nt=100;
  
  triqs::clef::placeholder<0> w_;
diff --git a/test/triqs/gfs/fourier1.cpp b/test/triqs/gfs/fourier1.cpp
index 9d61b17a..8ea4d77e 100644
--- a/test/triqs/gfs/fourier1.cpp
+++ b/test/triqs/gfs/fourier1.cpp
@@ -6,8 +6,6 @@ using namespace triqs::gfs;
 
 int main() {
 
- triqs::gfs::freq_infty inf;
-
  double beta =1;
  auto G =  gf<imfreq> {{beta, Fermion}, {2,2}};
  auto Gc = G;
diff --git a/test/triqs/gfs/gf_2times.cpp b/test/triqs/gfs/gf_2times.cpp
index cacfcb32..376ec5f6 100644
--- a/test/triqs/gfs/gf_2times.cpp
+++ b/test/triqs/gfs/gf_2times.cpp
@@ -24,12 +24,11 @@ int main() {
  std::cout  << G.data().shape() << 2*G(0,0)<<std::endl;
 
  auto xx =eval ( G(t_,tp_), t_=2, tp_=1.2);
-//xx =0;
+ std::cerr << xx << std::endl;
+ //xx =0;
  std::cout  << eval ( gg(t_), t_=2)<< std::endl ;
 
  double beta = 1;
- double wmin=0.;
- double wmax=1.0;
  int n_im_freq=100;
  
  auto G_w_wn2 = gf<cartesian_product<imfreq,imfreq>>( {gf_mesh<imfreq>(beta, Fermion, n_im_freq), gf_mesh<imfreq>(beta, Fermion, n_im_freq)}, {2,2});
diff --git a/test/triqs/gfs/gf_retw.cpp b/test/triqs/gfs/gf_retw.cpp
index fe3f06dd..87c4267d 100644
--- a/test/triqs/gfs/gf_retw.cpp
+++ b/test/triqs/gfs/gf_retw.cpp
@@ -24,7 +24,6 @@ int main() {
  auto Giw2 = gf<imfreq,scalar_valued> {{beta, Fermion, N}};
  auto Git2 = gf<imtime,scalar_valued> {{beta, Fermion, N}};
 
- int i =0;
  for (auto & t : Gt.mesh()) Gt[t] = 1.0*t;
  for (auto & w : Gw.mesh()) Gw[w] = 1.0*w;
  for (auto & it : Git.mesh()) Git[it] = 1.0*it;
diff --git a/test/triqs/gfs/gfv2.cpp b/test/triqs/gfs/gfv2.cpp
index c3ad15a9..e79e83fc 100644
--- a/test/triqs/gfs/gfv2.cpp
+++ b/test/triqs/gfs/gfv2.cpp
@@ -36,7 +36,6 @@ int main() {
   TEST( G( 0) ) ;
 
   triqs::clef::placeholder<0> om_;
-  triqs::clef::placeholder<1> nu_;
 
   TEST( G(om_) ) ;
   TEST( eval(G(om_), om_=0) ) ;
diff --git a/test/triqs/mc_tools/different_moves_mc.cpp b/test/triqs/mc_tools/different_moves_mc.cpp
index 87d0bd72..ae06fb51 100644
--- a/test/triqs/mc_tools/different_moves_mc.cpp
+++ b/test/triqs/mc_tools/different_moves_mc.cpp
@@ -43,7 +43,7 @@ struct move_right {
 struct compute_histo{
   configuration *config;
   triqs::arrays::array<double,1> H;  // an histogram
-  int tot, xmax;
+  int xmax, tot;
   compute_histo(configuration &config_, triqs::arrays::array<double,1> &H_, int xmax_) : config(&config_), H(H_), xmax(xmax_), tot(0) {}
   void accumulate(double sign) {
    if( config->x+xmax>=0 && config->x-xmax<0){
diff --git a/triqs/arrays/storages/mem_block.hpp b/triqs/arrays/storages/mem_block.hpp
index 29266a3d..21596830 100644
--- a/triqs/arrays/storages/mem_block.hpp
+++ b/triqs/arrays/storages/mem_block.hpp
@@ -134,7 +134,7 @@ namespace triqs { namespace arrays { namespace storages { //namespace details {
 #endif
 
   //Construct to state 0
-  mem_block():size_(0),p(nullptr),py_numpy(nullptr), py_guard(nullptr), ref_count(1), weak_ref_count(0){}
+   mem_block() : size_(0), p(nullptr), ref_count(1), weak_ref_count(0), py_numpy(nullptr), py_guard(nullptr) {}
 
   // construct to state 1 with a given size.
   mem_block (size_t s):size_(s),py_numpy(nullptr), py_guard(nullptr){
diff --git a/triqs/clef/clef.hpp b/triqs/clef/clef.hpp
index 74b0bc49..5262c91f 100644
--- a/triqs/clef/clef.hpp
+++ b/triqs/clef/clef.hpp
@@ -54,7 +54,7 @@ namespace triqs { namespace clef {
  /* ---------------------------------------------------------------------------------------------------
   *  Placeholder and corresponding traits
   *  --------------------------------------------------------------------------------------------------- */
- template<int i, typename T> class pair; // forward
+ template<int i, typename T> struct pair; // forward
 
  // a placeholder is an empty struct, labelled by an int.
  template<int N> struct placeholder {
diff --git a/triqs/gfs/gf.hpp b/triqs/gfs/gf.hpp
index 86a6950e..e4a8e5c4 100644
--- a/triqs/gfs/gf.hpp
+++ b/triqs/gfs/gf.hpp
@@ -293,7 +293,7 @@ namespace gfs {
    return "Gf" + gfs_implementation::h5_name<Variable, Target, Opt>::invoke();
   }
 
-  friend class gfs_implementation::h5_rw<Variable, Target, Opt>;
+  friend struct gfs_implementation::h5_rw<Variable, Target, Opt>;
 
   /// Write into HDF5
   friend void h5_write(h5::group fg, std::string subgroup_name, gf_impl const &g) {
diff --git a/triqs/gfs/local/tail.hpp b/triqs/gfs/local/tail.hpp
index 7bf728ae..a2d78805 100644
--- a/triqs/gfs/local/tail.hpp
+++ b/triqs/gfs/local/tail.hpp
@@ -97,7 +97,7 @@ namespace triqs { namespace gfs { namespace local {
           mask() = order_min+size_-1;
           _data() = 0;
       }
-      tail_impl(data_type const &d, mask_type const &m, long omin_): mask(m), _data(d), omin(omin_) {}
+      tail_impl(data_type const &d, mask_type const &m, long omin_) : omin(omin_), mask(m), _data(d) {}
       tail_impl(tail_impl<!IsView> const & x): omin(x.omin), mask(x.mask), _data(x._data) {}
       tail_impl(tail_impl const &) = default;
       tail_impl(tail_impl &&) = default;
@@ -309,9 +309,9 @@ namespace triqs { namespace gfs { namespace local {
   inline tail mult_impl(tail_view const & l, tail_view const& r) {
     if (l.shape()[1] != r.shape()[0] || l.order_min() != r.order_min() || l.size() != r.size())
       TRIQS_RUNTIME_ERROR<< "tail multiplication: shape mismatch";
-    long omin1 = l.smallest_nonzero() + r.smallest_nonzero();
+    //long omin1 = l.smallest_nonzero() + r.smallest_nonzero();
     long omax1 = std::min(std::min(r.order_max()+l.smallest_nonzero(), l.order_max()+r.smallest_nonzero()), r.order_min()+long(r.size())-1);
-    size_t si = omax1-omin1+1;
+    //size_t si = omax1-omin1+1;
 
     tail res(l.shape(), l.size(), l.order_min());
     res.mask_view() = omax1;
diff --git a/triqs/utility/c14.hpp b/triqs/utility/c14.hpp
index a3549b6f..4676b344 100644
--- a/triqs/utility/c14.hpp
+++ b/triqs/utility/c14.hpp
@@ -18,8 +18,7 @@
  * TRIQS. If not, see <http://www.gnu.org/licenses/>.
  *
  ******************************************************************************/
-#ifndef TRIQS_C14_FIX_H
-#define TRIQS_C14_FIX_H
+#pragma once
 #include <memory>
 //#include <functional>
 #include <tuple>
@@ -57,11 +56,7 @@ namespace std {
  template<int i, typename ... Args>
   auto get(c14::tuple<Args...> const & t) DECL_AND_RETURN( std::get<i>(static_cast<std::tuple<Args...>>(t)));
 
- template<typename ... Args> struct tuple_size<c14::tuple<Args...>>: tuple_size<std::tuple<Args...>>{};
-
+ template<typename ... Args> class tuple_size<c14::tuple<Args...>>: public tuple_size<std::tuple<Args...>>{};
 
 }
 
-
-#endif
-
diff --git a/triqs/utility/tuple_tools.hpp b/triqs/utility/tuple_tools.hpp
index 80ef98f4..2fcd748b 100644
--- a/triqs/utility/tuple_tools.hpp
+++ b/triqs/utility/tuple_tools.hpp
@@ -42,7 +42,7 @@ namespace std {
   template<int pos, typename TU> auto get(_triqs_reversed_tuple<TU> && t)      
    DECL_AND_RETURN(std::get<std::tuple_size<typename std::remove_const<typename std::remove_reference<TU>::type>::type>::value-1-pos>(move(t)._x));
 
-  template<typename TU> struct tuple_size<_triqs_reversed_tuple<TU>>         : tuple_size<typename std::remove_const<typename std::remove_reference<TU>::type>::type>{};
+  template<typename TU> class tuple_size<_triqs_reversed_tuple<TU>>         : public tuple_size<typename std::remove_const<typename std::remove_reference<TU>::type>::type>{};
 }
 
 namespace triqs { namespace tuple {