diff --git a/src/plugins/cpptools/compileroptionsbuilder.cpp b/src/plugins/cpptools/compileroptionsbuilder.cpp
index ee534757ea1..1f15ebddda7 100644
--- a/src/plugins/cpptools/compileroptionsbuilder.cpp
+++ b/src/plugins/cpptools/compileroptionsbuilder.cpp
@@ -28,6 +28,8 @@
 #include "cppmodelmanager.h"
 #include "headerpathfilter.h"
 
+#include <baremetal/baremetalconstants.h>
+
 #include <coreplugin/icore.h>
 
 #include <projectexplorer/headerpath.h>
@@ -352,6 +354,11 @@ void CompilerOptionsBuilder::addPrecompiledHeaderOptions(UsePrecompiledHeaders u
 
 void CompilerOptionsBuilder::addProjectMacros()
 {
+    static const int useMacros = qEnvironmentVariableIntValue("QTC_CLANG_USE_TOOLCHAIN_MACROS");
+
+    if (m_projectPart.toolchainType == BareMetal::Constants::IAREW_TOOLCHAIN_TYPEID || useMacros)
+        addMacros(m_projectPart.toolChainMacros);
+
     addMacros(m_projectPart.projectMacros);
 }