diff --git a/CMakeLists.txt b/CMakeLists.txt
index 63b2138e..dc11c43e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,7 +31,7 @@
 # CMake project definitions
 # ==============================================================================
 cmake_minimum_required(VERSION 3.16.0)
-project(ot-efr32 VERSION 1.0.0)
+project(ot-efr32 VERSION 1.0.0 LANGUAGES C CXX ASM)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)
diff --git a/slc/exporter_templates/platform_library/CMakeLists.txt.jinja b/slc/exporter_templates/platform_library/CMakeLists.txt.jinja
index e211d2e8..8f6cf25f 100644
--- a/slc/exporter_templates/platform_library/CMakeLists.txt.jinja
+++ b/slc/exporter_templates/platform_library/CMakeLists.txt.jinja
@@ -88,19 +88,12 @@ target_include_directories({{PROJECT_NAME}} PRIVATE
 # ==============================================================================
 target_sources({{PROJECT_NAME}} PRIVATE
 {%- for source in NON_MBEDTLS_SOURCES %}
-    {%- if source.endswith('.c') or source.endswith('.cpp') or source.endswith('.h') or source.endswith('.hpp') %}
+    {%- if source.endswith('.c') or source.endswith('.cpp') or source.endswith('.h') or source.endswith('.hpp') or source.endswith('.s') or source.endswith('.S') %}
     {{source}}
     {%- endif %}
 {%- endfor %}
 )
 
-{%- for source in NON_MBEDTLS_SOURCES %}
-    {%- if source.endswith('.s') or source.endswith('.S') %}
-target_sources({{PROJECT_NAME}} PRIVATE {{source}})
-set_property(SOURCE {{source}} PROPERTY LANGUAGE C)
-    {%- endif %}
-{%- endfor %}
-
 # ==============================================================================
 # Compile definitions
 # ==============================================================================
diff --git a/src/efr32mg1/arm-none-eabi.cmake b/src/efr32mg1/arm-none-eabi.cmake
index 9f2e385f..543c7ac4 100644
--- a/src/efr32mg1/arm-none-eabi.cmake
+++ b/src/efr32mg1/arm-none-eabi.cmake
@@ -31,7 +31,7 @@ set(CMAKE_SYSTEM_PROCESSOR         ARM)
 
 set(CMAKE_C_COMPILER               arm-none-eabi-gcc)
 set(CMAKE_CXX_COMPILER             arm-none-eabi-g++)
-set(CMAKE_ASM_COMPILER             arm-none-eabi-as)
+set(CMAKE_ASM_COMPILER             arm-none-eabi-gcc)
 set(CMAKE_RANLIB                   arm-none-eabi-ranlib)
 
 execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE COMPILER_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -40,6 +40,7 @@ set(COMMON_C_FLAGS                 "-mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-ab
 
 set(CMAKE_C_FLAGS_INIT             "${COMMON_C_FLAGS} -std=c99")
 set(CMAKE_CXX_FLAGS_INIT           "${COMMON_C_FLAGS} -fno-exceptions -fno-rtti")
+set(CMAKE_ASM_FLAGS_INIT           "${CMAKE_C_FLAGS_INIT} -x assembler-with-cpp")
 set(CMAKE_EXE_LINKER_FLAGS_INIT    "${COMMON_C_FLAGS} -specs=nano.specs -specs=nosys.specs")
 
 set(CMAKE_C_FLAGS_DEBUG            "-Og -g")
diff --git a/src/efr32mg12/arm-none-eabi.cmake b/src/efr32mg12/arm-none-eabi.cmake
index 9f2e385f..543c7ac4 100644
--- a/src/efr32mg12/arm-none-eabi.cmake
+++ b/src/efr32mg12/arm-none-eabi.cmake
@@ -31,7 +31,7 @@ set(CMAKE_SYSTEM_PROCESSOR         ARM)
 
 set(CMAKE_C_COMPILER               arm-none-eabi-gcc)
 set(CMAKE_CXX_COMPILER             arm-none-eabi-g++)
-set(CMAKE_ASM_COMPILER             arm-none-eabi-as)
+set(CMAKE_ASM_COMPILER             arm-none-eabi-gcc)
 set(CMAKE_RANLIB                   arm-none-eabi-ranlib)
 
 execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE COMPILER_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -40,6 +40,7 @@ set(COMMON_C_FLAGS                 "-mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-ab
 
 set(CMAKE_C_FLAGS_INIT             "${COMMON_C_FLAGS} -std=c99")
 set(CMAKE_CXX_FLAGS_INIT           "${COMMON_C_FLAGS} -fno-exceptions -fno-rtti")
+set(CMAKE_ASM_FLAGS_INIT           "${CMAKE_C_FLAGS_INIT} -x assembler-with-cpp")
 set(CMAKE_EXE_LINKER_FLAGS_INIT    "${COMMON_C_FLAGS} -specs=nano.specs -specs=nosys.specs")
 
 set(CMAKE_C_FLAGS_DEBUG            "-Og -g")
diff --git a/src/efr32mg13/arm-none-eabi.cmake b/src/efr32mg13/arm-none-eabi.cmake
index 9f2e385f..543c7ac4 100644
--- a/src/efr32mg13/arm-none-eabi.cmake
+++ b/src/efr32mg13/arm-none-eabi.cmake
@@ -31,7 +31,7 @@ set(CMAKE_SYSTEM_PROCESSOR         ARM)
 
 set(CMAKE_C_COMPILER               arm-none-eabi-gcc)
 set(CMAKE_CXX_COMPILER             arm-none-eabi-g++)
-set(CMAKE_ASM_COMPILER             arm-none-eabi-as)
+set(CMAKE_ASM_COMPILER             arm-none-eabi-gcc)
 set(CMAKE_RANLIB                   arm-none-eabi-ranlib)
 
 execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE COMPILER_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -40,6 +40,7 @@ set(COMMON_C_FLAGS                 "-mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-ab
 
 set(CMAKE_C_FLAGS_INIT             "${COMMON_C_FLAGS} -std=c99")
 set(CMAKE_CXX_FLAGS_INIT           "${COMMON_C_FLAGS} -fno-exceptions -fno-rtti")
+set(CMAKE_ASM_FLAGS_INIT           "${CMAKE_C_FLAGS_INIT} -x assembler-with-cpp")
 set(CMAKE_EXE_LINKER_FLAGS_INIT    "${COMMON_C_FLAGS} -specs=nano.specs -specs=nosys.specs")
 
 set(CMAKE_C_FLAGS_DEBUG            "-Og -g")
diff --git a/src/efr32mg21/arm-none-eabi.cmake b/src/efr32mg21/arm-none-eabi.cmake
index 04603163..a803b08e 100644
--- a/src/efr32mg21/arm-none-eabi.cmake
+++ b/src/efr32mg21/arm-none-eabi.cmake
@@ -31,7 +31,7 @@ set(CMAKE_SYSTEM_PROCESSOR         ARM)
 
 set(CMAKE_C_COMPILER               arm-none-eabi-gcc)
 set(CMAKE_CXX_COMPILER             arm-none-eabi-g++)
-set(CMAKE_ASM_COMPILER             arm-none-eabi-as)
+set(CMAKE_ASM_COMPILER             arm-none-eabi-gcc)
 set(CMAKE_RANLIB                   arm-none-eabi-ranlib)
 
 execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE COMPILER_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -40,6 +40,7 @@ set(COMMON_C_FLAGS                 "-mcpu=cortex-m33 -mthumb -fmessage-length=0
 
 set(CMAKE_C_FLAGS_INIT             "${COMMON_C_FLAGS} -std=c99")
 set(CMAKE_CXX_FLAGS_INIT           "${COMMON_C_FLAGS} -fno-exceptions -fno-rtti")
+set(CMAKE_ASM_FLAGS_INIT           "${CMAKE_C_FLAGS_INIT} -x assembler-with-cpp")
 set(CMAKE_EXE_LINKER_FLAGS_INIT    "${COMMON_C_FLAGS} -specs=nano.specs -specs=nosys.specs")
 
 set(CMAKE_C_FLAGS_DEBUG            "-Og -g")
diff --git a/src/efr32mg24/arm-none-eabi.cmake b/src/efr32mg24/arm-none-eabi.cmake
index 04603163..a803b08e 100644
--- a/src/efr32mg24/arm-none-eabi.cmake
+++ b/src/efr32mg24/arm-none-eabi.cmake
@@ -31,7 +31,7 @@ set(CMAKE_SYSTEM_PROCESSOR         ARM)
 
 set(CMAKE_C_COMPILER               arm-none-eabi-gcc)
 set(CMAKE_CXX_COMPILER             arm-none-eabi-g++)
-set(CMAKE_ASM_COMPILER             arm-none-eabi-as)
+set(CMAKE_ASM_COMPILER             arm-none-eabi-gcc)
 set(CMAKE_RANLIB                   arm-none-eabi-ranlib)
 
 execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE COMPILER_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -40,6 +40,7 @@ set(COMMON_C_FLAGS                 "-mcpu=cortex-m33 -mthumb -fmessage-length=0
 
 set(CMAKE_C_FLAGS_INIT             "${COMMON_C_FLAGS} -std=c99")
 set(CMAKE_CXX_FLAGS_INIT           "${COMMON_C_FLAGS} -fno-exceptions -fno-rtti")
+set(CMAKE_ASM_FLAGS_INIT           "${CMAKE_C_FLAGS_INIT} -x assembler-with-cpp")
 set(CMAKE_EXE_LINKER_FLAGS_INIT    "${COMMON_C_FLAGS} -specs=nano.specs -specs=nosys.specs")
 
 set(CMAKE_C_FLAGS_DEBUG            "-Og -g")