diff --git a/arch/sim/Kconfig b/arch/sim/Kconfig
index e70425c786295..b8ace8699b9ad 100644
--- a/arch/sim/Kconfig
+++ b/arch/sim/Kconfig
@@ -37,6 +37,7 @@ config ARCH_CHIP
 
 choice
 	prompt "Toolchain Selection"
+	default SIM_TOOLCHAIN_CLANG if HOST_MACOS
 	default SIM_TOOLCHAIN_GCC
 
 config SIM_TOOLCHAIN_GCC
diff --git a/arch/sim/src/cmake/Toolchain.cmake b/arch/sim/src/cmake/Toolchain.cmake
index cf91d6f4cd218..3b21b25fbc81c 100644
--- a/arch/sim/src/cmake/Toolchain.cmake
+++ b/arch/sim/src/cmake/Toolchain.cmake
@@ -20,7 +20,7 @@
 #
 # ##############################################################################
 
-if(APPLE)
+if(APPLE AND CONFIG_SIM_TOOLCHAIN_GCC)
   find_program(CMAKE_C_ELF_COMPILER x86_64-elf-gcc)
   find_program(CMAKE_CXX_ELF_COMPILER x86_64-elf-g++)
 endif()
@@ -121,7 +121,12 @@ if(CONFIG_STACK_USAGE_WARNING)
 endif()
 
 if(CONFIG_COVERAGE_ALL)
-  add_compile_options(-fprofile-arcs -ftest-coverage -fno-inline)
+  if(CONFIG_ARCH_TOOLCHAIN_GCC)
+    add_compile_options(-fprofile-arcs -ftest-coverage -fno-inline)
+  elseif(CONFIG_ARCH_TOOLCHAIN_CLANG)
+    add_compile_options(-fprofile-instr-generate -fcoverage-mapping)
+    add_link_options(-fprofile-instr-generate)
+  endif()
 endif()
 
 if(CONFIG_PROFILE_ALL OR CONFIG_SIM_PROFILE)
diff --git a/arch/sim/src/sim/posix/sim_hostmisc.c b/arch/sim/src/sim/posix/sim_hostmisc.c
index 009005bff4484..a2338ebbd16cd 100644
--- a/arch/sim/src/sim/posix/sim_hostmisc.c
+++ b/arch/sim/src/sim/posix/sim_hostmisc.c
@@ -24,6 +24,7 @@
  * Included Files
  ****************************************************************************/
 
+#include <signal.h>
 #include <errno.h>
 #include <limits.h>
 #include <stdio.h>