ignore warnings from gtest

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