diff --git a/tests/algorithm_tests.cpp b/tests/algorithm_tests.cpp
index 9345e95..96bfb93 100644
--- a/tests/algorithm_tests.cpp
+++ b/tests/algorithm_tests.cpp
@@ -20,6 +20,13 @@
 #pragma warning(disable : 26440 26426) // from catch
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
 #include <gtest/gtest.h>
 
 #include <gsl/gsl_algorithm> // for copy
@@ -214,3 +221,7 @@ TEST(algorithm_tests, small_destination_span)
     copy(src_span_static, dst_span_static);
 #endif
 }
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/assertion_tests.cpp b/tests/assertion_tests.cpp
index 6aa3830..b1d8f60 100644
--- a/tests/assertion_tests.cpp
+++ b/tests/assertion_tests.cpp
@@ -20,6 +20,14 @@
 #pragma warning(disable : 26440 26426) // from catch
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
 #include <gtest/gtest.h>
 
 #include <gsl/gsl_assert> // for fail_fast (ptr only), Ensures, Expects
@@ -54,3 +62,7 @@ TEST(assertion_tests, ensures)
     EXPECT_EQ(g(2), 3);
     EXPECT_DEATH(g(9), ".*");
 }
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/at_tests.cpp b/tests/at_tests.cpp
index fb007b8..67e8729 100644
--- a/tests/at_tests.cpp
+++ b/tests/at_tests.cpp
@@ -20,7 +20,15 @@
 #pragma warning(disable : 26440 26426) // from catch
 #endif
 
-#include <gtest/gtest.h> 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
+#include <gtest/gtest.h>
 
 #include <gsl/gsl_util> // for at
 
@@ -115,3 +123,6 @@ static constexpr bool test_constexpr()
 static_assert(test_constexpr(), "FAIL");
 #endif
 
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/bounds_tests.cpp b/tests/bounds_tests.cpp
index d8a9793..7bd3b2a 100644
--- a/tests/bounds_tests.cpp
+++ b/tests/bounds_tests.cpp
@@ -24,9 +24,14 @@
 #if __clang__ || __GNUC__
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+//disable warnings from gtest
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
 #endif
 
-#include <gtest/gtest.h> 
+#include <gtest/gtest.h>
 
 #include <gsl/multi_span> // for static_bounds, static_bounds_dynamic_range_t
 
@@ -96,8 +101,6 @@ TEST(bounds_tests, bounds_convertible)
     static_bounds<7, 4, 2> b4 = b3;
     (void) b4;
 
-    static_bounds<dynamic_range> b11;
-
     static_bounds<dynamic_range> b5;
     static_bounds<34> b6;
 
diff --git a/tests/byte_tests.cpp b/tests/byte_tests.cpp
index 0a8a1f6..6d3342a 100644
--- a/tests/byte_tests.cpp
+++ b/tests/byte_tests.cpp
@@ -20,6 +20,14 @@
 #pragma warning(disable : 26440 26426) // from catch
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
 #include <gtest/gtest.h>
 
 #include <gsl/gsl_byte> // for to_byte, to_integer, byte, operator&, ope...
@@ -133,3 +141,7 @@ TEST(byte_tests, aliasing)
 #ifdef CONFIRM_COMPILATION_ERRORS
 copy(src_span_static, dst_span_static);
 #endif
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/multi_span_tests.cpp b/tests/multi_span_tests.cpp
index 53c029e..63ebd63 100644
--- a/tests/multi_span_tests.cpp
+++ b/tests/multi_span_tests.cpp
@@ -25,6 +25,12 @@
 #if __clang__ || __GNUC__
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+//disable warnings from gtest
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+
 #endif
 
 #include <gtest/gtest.h>
@@ -1033,18 +1039,18 @@ TEST(multi_span_test, rank)
 
     {
         multi_span<int> s;
-        EXPECT_EQ(s.rank(), 1);
+        EXPECT_EQ(s.rank(), static_cast<size_t>(1));
     }
 
     {
         multi_span<int, 2> s = arr;
-        EXPECT_EQ(s.rank(), 1);
+        EXPECT_EQ(s.rank(), static_cast<size_t>(1));
     }
 
     int arr2d[1][1] = {};
     {
         multi_span<int, 1, 1> s = arr2d;
-        EXPECT_EQ(s.rank(), 2);
+        EXPECT_EQ(s.rank(), static_cast<size_t>(2));
     }
 }
 
diff --git a/tests/notnull_tests.cpp b/tests/notnull_tests.cpp
index c2dfbdb..b26e618 100644
--- a/tests/notnull_tests.cpp
+++ b/tests/notnull_tests.cpp
@@ -23,6 +23,14 @@
 #pragma warning(disable : 4702) // unreachable code
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
 #include <gtest/gtest.h>
 
 #include <gsl/pointers> // for not_null, operator<, operator<=, operator>
@@ -527,3 +535,7 @@ TEST(notnull_tests, TestMakeNotNull)
 
 static_assert(std::is_nothrow_move_constructible<not_null<void*>>::value,
               "not_null must be no-throw move constructible");
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/owner_tests.cpp b/tests/owner_tests.cpp
index 9babb38..32343af 100644
--- a/tests/owner_tests.cpp
+++ b/tests/owner_tests.cpp
@@ -21,6 +21,14 @@
 
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
 #include <gtest/gtest.h>
 
 #include <gsl/pointers> // for owner
@@ -48,3 +56,7 @@ TEST(owner_tests, check_pointer_constraint)
     }
     #endif
 }
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/span_tests.cpp b/tests/span_tests.cpp
index 15a5109..2e752fd 100644
--- a/tests/span_tests.cpp
+++ b/tests/span_tests.cpp
@@ -21,6 +21,14 @@
 
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
 #include <gsl/gsl_byte> // for byte
 #include <gsl/gsl_util> // for narrow_cast, at
 #include <gsl/span>     // for span, span_iterator, operator==, operator!=
@@ -1548,3 +1556,7 @@ TEST(span_test, from_array_constructor)
      EXPECT_TRUE((std::is_default_constructible<span<int, 0>>::value));
      EXPECT_FALSE((std::is_default_constructible<span<int, 42>>::value));
  }
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/strict_notnull_tests.cpp b/tests/strict_notnull_tests.cpp
index 07aa957..f060912 100644
--- a/tests/strict_notnull_tests.cpp
+++ b/tests/strict_notnull_tests.cpp
@@ -23,6 +23,14 @@
 #pragma warning(disable : 4702) // unreachable code
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
 #include <gtest/gtest.h>
 #include <gsl/pointers>           // for not_null, operator<, operator<=, operator>
 
@@ -191,3 +199,7 @@ TEST(strict_notnull_tests, TestStrictNotNullConstructorTypeDeduction)
 
 static_assert(std::is_nothrow_move_constructible<strict_not_null<void*>>::value,
               "strict_not_null must be no-throw move constructible");
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/strided_span_tests.cpp b/tests/strided_span_tests.cpp
index 460bb01..6344228 100644
--- a/tests/strided_span_tests.cpp
+++ b/tests/strided_span_tests.cpp
@@ -25,6 +25,11 @@
 #if __clang__ || __GNUC__
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+//disable warnings from gtest
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
 #endif
 
 #include <gtest/gtest.h>
diff --git a/tests/string_span_tests.cpp b/tests/string_span_tests.cpp
index 2a56c46..41863e4 100644
--- a/tests/string_span_tests.cpp
+++ b/tests/string_span_tests.cpp
@@ -21,7 +21,15 @@
 
 #endif
 
-#include <gtest/gtest.h> 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
+#include <gtest/gtest.h>
 
 #include <gsl/gsl_assert>  // for Expects, fail_fast (ptr only)
 #include <gsl/pointers>    // for owner
@@ -68,6 +76,9 @@ T move_wrapper(T&& t)
     return std::move(t);
 }
 
+// not used otherwise
+#ifdef CONFIRM_COMPILATION_ERRORS
+
 template <class T>
 T create()
 {
@@ -78,6 +89,7 @@ template <class T>
 void use(basic_string_span<T, gsl::dynamic_extent>)
 {
 }
+#endif
 
 czstring_span<> CreateTempName(string_span<> span)
 {
@@ -226,26 +238,26 @@ TEST(string_span_tests, TestConversionFromConst)
 TEST(string_span_tests, TestToString)
 {
     auto s = gsl::to_string(cstring_span<>{});
-    EXPECT_EQ(s.length(), 0);
+    EXPECT_EQ(s.length(), static_cast<size_t>(0));
 
     char stack_string[] = "Hello";
     cstring_span<> v = ensure_z(stack_string);
     auto s2 = gsl::to_string(v);
     EXPECT_EQ(static_cast<cstring_span<>::index_type>(s2.length()), v.length());
-    EXPECT_EQ(s2.length(), 5);
+    EXPECT_EQ(s2.length(), static_cast<size_t>(5));
 }
 
 TEST(string_span_tests, TestToBasicString)
 {
     auto s = gsl::to_basic_string<char, std::char_traits<char>, ::std::allocator<char>>(
         cstring_span<>{});
-    EXPECT_EQ(s.length(), 0);
+    EXPECT_EQ(s.length(), static_cast<size_t>(0));
 
     char stack_string[] = "Hello";
     cstring_span<> v = ensure_z(stack_string);
     auto s2 = gsl::to_basic_string<char, std::char_traits<char>, ::std::allocator<char>>(v);
     EXPECT_EQ(static_cast<cstring_span<>::index_type>(s2.length()), v.length());
-    EXPECT_EQ(s2.length(), 5);
+    EXPECT_EQ(s2.length(), static_cast<size_t>(5));
 }
 
 TEST(string_span_tests, EqualityAndImplicitConstructors)
@@ -1198,3 +1210,7 @@ TEST(string_span_tests, as_writeable_bytes)
     EXPECT_EQ(static_cast<const void*>(bs.data()), static_cast<const void*>(s.data()));
     EXPECT_EQ(bs.size(), s.size_bytes());
 }
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif
diff --git a/tests/utils_tests.cpp b/tests/utils_tests.cpp
index a135749..3583ea4 100644
--- a/tests/utils_tests.cpp
+++ b/tests/utils_tests.cpp
@@ -21,6 +21,14 @@
 
 #endif
 
+#if __clang__ || __GNUC__
+//disable warnings from gtest
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wglobal-constructors"
+#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
+#pragma GCC diagnostic ignored "-Wcovered-switch-default"
+#endif
+
 #include <gtest/gtest.h>
 
 #include <gsl/gsl_util> // for narrow, finally, narrow_cast, narrowing_e...
@@ -130,3 +138,7 @@ TEST(utils_tests, narrow)
 #endif
 
 }
+
+#if __clang__ || __GNUC__
+#pragma GCC diagnostic pop
+#endif