diff --git a/bstrees/config_macros.hpp b/bstrees/config_macros.hpp
index f3cb635..8b1a6ff 100644
--- a/bstrees/config_macros.hpp
+++ b/bstrees/config_macros.hpp
@@ -292,7 +292,7 @@
 #define ATTRIBUTE_COLD
 #endif
 
-#if CONFIG_GNUC_AT_LEAST(4, 4) || CONFIG_HAS_GCC_ATTRIBUTE(hot)
+#if CONFIG_GNUC_AT_LEAST(4, 3) || CONFIG_HAS_GCC_ATTRIBUTE(hot)
 #define ATTRIBUTE_HOT __attribute__((hot))
 #elif (defined(__GNUG__) || defined(__clang__)) && CONFIG_HAS_CPP_ATTRIBUTE(gnu::hot)
 #define ATTRIBUTE_HOT [[gnu::hot]]
@@ -427,7 +427,23 @@
 #define ATTRIBUTE_FALLTHROUGH
 #endif
 
-#if defined(__clang__)
+#if CONFIG_CLANG_AT_LEAST(3, 7)
+/*
+ * nullability specifier is a Clang extension
+ * Possible warning can be suppressed with the following code:
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic push
+ * #pragma clang diagnostic ignored "-Wnullability-extension"
+ * #endif
+ *
+ * Some code that uses CONFIG_CLANG_NONNULL_QUALIFIER or CONFIG_CLANG_NULLABLE_QUALIFIER
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic pop
+ * #endif
+ *
+ **/
 #define CONFIG_CLANG_NONNULL_QUALIFIER  _Nonnull
 #define CONFIG_CLANG_NULLABLE_QUALIFIER _Nullable
 #else
@@ -609,11 +625,12 @@ namespace config {
 
 template <class T>
 ATTRIBUTE_ALWAYS_INLINE constexpr bool is_gcc_constant_p(ATTRIBUTE_MAYBE_UNUSED T expr) noexcept {
+#if CONFIG_HAS_BUILTIN(__builtin_constant_p)
 #if CONFIG_HAS_INCLUDE(<type_traits>)
+    // not std::is_trivial_v for backward compatibility with old compilers C++ versions
     static_assert(std::is_trivial<T>::value,
                   "Type passed to the is_gcc_constant_p() should be trivial");
 #endif
-#if CONFIG_HAS_BUILTIN(__builtin_constant_p)
     return static_cast<bool>(__builtin_constant_p(expr));
 #else
     return false;
diff --git a/graphs/HungarianAlgorithm/config_macros.hpp b/graphs/HungarianAlgorithm/config_macros.hpp
index 14a6ba3..8b1a6ff 100644
--- a/graphs/HungarianAlgorithm/config_macros.hpp
+++ b/graphs/HungarianAlgorithm/config_macros.hpp
@@ -427,7 +427,23 @@
 #define ATTRIBUTE_FALLTHROUGH
 #endif
 
-#if defined(__clang__)
+#if CONFIG_CLANG_AT_LEAST(3, 7)
+/*
+ * nullability specifier is a Clang extension
+ * Possible warning can be suppressed with the following code:
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic push
+ * #pragma clang diagnostic ignored "-Wnullability-extension"
+ * #endif
+ *
+ * Some code that uses CONFIG_CLANG_NONNULL_QUALIFIER or CONFIG_CLANG_NULLABLE_QUALIFIER
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic pop
+ * #endif
+ *
+ **/
 #define CONFIG_CLANG_NONNULL_QUALIFIER  _Nonnull
 #define CONFIG_CLANG_NULLABLE_QUALIFIER _Nullable
 #else
diff --git a/number_theory/config_macros.hpp b/number_theory/config_macros.hpp
index 14a6ba3..8b1a6ff 100644
--- a/number_theory/config_macros.hpp
+++ b/number_theory/config_macros.hpp
@@ -427,7 +427,23 @@
 #define ATTRIBUTE_FALLTHROUGH
 #endif
 
-#if defined(__clang__)
+#if CONFIG_CLANG_AT_LEAST(3, 7)
+/*
+ * nullability specifier is a Clang extension
+ * Possible warning can be suppressed with the following code:
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic push
+ * #pragma clang diagnostic ignored "-Wnullability-extension"
+ * #endif
+ *
+ * Some code that uses CONFIG_CLANG_NONNULL_QUALIFIER or CONFIG_CLANG_NULLABLE_QUALIFIER
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic pop
+ * #endif
+ *
+ **/
 #define CONFIG_CLANG_NONNULL_QUALIFIER  _Nonnull
 #define CONFIG_CLANG_NULLABLE_QUALIFIER _Nullable
 #else
diff --git a/vec_instructs/config_macros.hpp b/vec_instructs/config_macros.hpp
index 14a6ba3..8b1a6ff 100644
--- a/vec_instructs/config_macros.hpp
+++ b/vec_instructs/config_macros.hpp
@@ -427,7 +427,23 @@
 #define ATTRIBUTE_FALLTHROUGH
 #endif
 
-#if defined(__clang__)
+#if CONFIG_CLANG_AT_LEAST(3, 7)
+/*
+ * nullability specifier is a Clang extension
+ * Possible warning can be suppressed with the following code:
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic push
+ * #pragma clang diagnostic ignored "-Wnullability-extension"
+ * #endif
+ *
+ * Some code that uses CONFIG_CLANG_NONNULL_QUALIFIER or CONFIG_CLANG_NULLABLE_QUALIFIER
+ *
+ * #if defined(__clang__)
+ * #pragma clang diagnostic pop
+ * #endif
+ *
+ **/
 #define CONFIG_CLANG_NONNULL_QUALIFIER  _Nonnull
 #define CONFIG_CLANG_NULLABLE_QUALIFIER _Nullable
 #else