diff --git a/src_c/IMB_exchange.c b/src_c/IMB_exchange.c
index ca2ead4..85d1025 100644
--- a/src_c/IMB_exchange.c
+++ b/src_c/IMB_exchange.c
@@ -107,7 +107,7 @@ Output variables:
     int s_num = 0,
         r_num = 0;
     int s_tag, r_tag;
-    int left, right;
+    int left = 0, right = 0;
     MPI_Status  stat[2];
     MPI_Request request[2];
 
diff --git a/src_c/IMB_output.c b/src_c/IMB_output.c
index bad342b..260277e 100644
--- a/src_c/IMB_output.c
+++ b/src_c/IMB_output.c
@@ -139,7 +139,7 @@ Input variables:
                       3 numbers (min/max/average)
 
 */
-    double scaled_time[MAX_TIME_ID];
+    double scaled_time[MAX_TIME_ID] = {0};
 
     int i, i_gr;
     int out_format;
diff --git a/src_cpp/MPI1/MPI1_suite.cpp b/src_cpp/MPI1/MPI1_suite.cpp
index c978815..88b21fd 100644
--- a/src_cpp/MPI1/MPI1_suite.cpp
+++ b/src_cpp/MPI1/MPI1_suite.cpp
@@ -840,6 +840,10 @@ template <> void BenchmarkSuite<BS_MPI1>::get_bench_list(vector<string> &benchs,
                                         result.detach_ptr(); }
 
 
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wfree-nonheap-object"
+#endif
 template<> any BenchmarkSuite<BS_MPI1>::get_parameter(const std::string &key) {
     using namespace NS_MPI1;
     any result;
@@ -848,6 +852,9 @@ template<> any BenchmarkSuite<BS_MPI1>::get_parameter(const std::string &key) {
     HANDLE_PARAMETER(GLOBALS, glob);
     return result;
 }
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
 
 #ifdef WIN32
 template BenchmarkSuite<BS_MPI1>;
diff --git a/src_cpp/helpers/helper_IMB_functions.h b/src_cpp/helpers/helper_IMB_functions.h
index 8502423..0d05d81 100755
--- a/src_cpp/helpers/helper_IMB_functions.h
+++ b/src_cpp/helpers/helper_IMB_functions.h
@@ -378,7 +378,7 @@ struct Bmark_descr {
     {
 
     /* IMB 3.1 << */
-        size_t s_len, r_len, s_alloc, r_alloc;
+        size_t s_len = 0, r_len = 0, s_alloc, r_alloc;
         int init_size, irep, i_s, i_r, x_sample;
         int asize = (int) sizeof(assign_type);
 
diff --git a/src_cpp/helpers/original_benchmark.h b/src_cpp/helpers/original_benchmark.h
index 59c373f..5ed2fda 100644
--- a/src_cpp/helpers/original_benchmark.h
+++ b/src_cpp/helpers/original_benchmark.h
@@ -134,7 +134,7 @@ class OriginalBenchmark : public Benchmark {
             int np = item.np;
             int imod = *(item.extra_fields.as<int>());
             double t;
-            MPI_Datatype base_s_dt, base_r_dt, base_red_dt;
+            MPI_Datatype base_s_dt = 0, base_r_dt = 0, base_red_dt = 0;
             if (!initialized)
                 return;
             if (descr->stop_iterations)
diff --git a/src_cpp/utils.h b/src_cpp/utils.h
index 9e9a1eb..e72c73f 100644
--- a/src_cpp/utils.h
+++ b/src_cpp/utils.h
@@ -72,7 +72,7 @@ namespace set_operations {
         transform(list.begin(), list.end(), inserter(tmp, tmp.end()), to_lower);
         list = tmp;
     }
-    struct case_insens_cmp : public std::binary_function<std::string, std::string, bool> {
+    struct case_insens_cmp {
         bool operator()(const std::string &lhs, const std::string &rhs) const {
 #ifdef WIN_IMB
             return stricmp(lhs.c_str(), rhs.c_str()) < 0;