diff --git a/src/catch2/benchmark/catch_optimizer.hpp b/src/catch2/benchmark/catch_optimizer.hpp
index 0dbfc145..02cf2073 100644
--- a/src/catch2/benchmark/catch_optimizer.hpp
+++ b/src/catch2/benchmark/catch_optimizer.hpp
@@ -10,7 +10,7 @@
 #ifndef CATCH_OPTIMIZER_HPP_INCLUDED
 #define CATCH_OPTIMIZER_HPP_INCLUDED
 
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) || defined(__IAR_SYSTEMS_ICC__)
 #   include <atomic> // atomic_thread_fence
 #endif
 
@@ -32,16 +32,23 @@ namespace Catch {
         namespace Detail {
             inline void optimizer_barrier() { keep_memory(); }
         } // namespace Detail
-#elif defined(_MSC_VER)
+#elif defined(_MSC_VER) || defined(__IAR_SYSTEMS_ICC__)
 
+#if defined(_MSVC_VER)
 #pragma optimize("", off)
+#elif defined(__IAR_SYSTEMS_ICC__)
+// For IAR the pragma only affects the following function
+#pragma optimize=disable
+#endif
         template <typename T>
         inline void keep_memory(T* p) {
             // thanks @milleniumbug
             *reinterpret_cast<char volatile*>(p) = *reinterpret_cast<char const volatile*>(p);
         }
         // TODO equivalent keep_memory()
+#if defined(_MSVC_VER)
 #pragma optimize("", on)
+#endif
 
         namespace Detail {
             inline void optimizer_barrier() {
diff --git a/src/catch2/reporters/catch_reporter_junit.cpp b/src/catch2/reporters/catch_reporter_junit.cpp
index 22d6526f..9a9b94af 100644
--- a/src/catch2/reporters/catch_reporter_junit.cpp
+++ b/src/catch2/reporters/catch_reporter_junit.cpp
@@ -33,6 +33,8 @@ namespace Catch {
             gmtime_s(&timeInfo, &rawtime);
 #elif defined (CATCH_PLATFORM_PLAYSTATION)
             gmtime_s(&rawtime, &timeInfo);
+#elif defined (__IAR_SYSTEMS_ICC__)
+            timeInfo = *std::gmtime(&rawtime);
 #else
             gmtime_r(&rawtime, &timeInfo);
 #endif