From 46ba8792356b12007c671d1a6a5fa7ab50abd90c Mon Sep 17 00:00:00 2001
From: Aditya Yadav <166515021+aditya0yadav@users.noreply.github.com>
Date: Wed, 4 Mar 2026 21:33:59 +0000
Subject: [PATCH] sim: Fix linker support and macOS host build issues

Update SIM configuration and CMake toolchain to resolve
linker errors when building on macOS. Adjust POSIX host
implementation to ensure successful compilation and
proper behavior of the sim target.

Modified:
- arch/sim/Kconfig
- arch/sim/src/cmake/Toolchain.cmake
- arch/sim/src/sim/posix/sim_hostmisc.c

Signed-off-by: Aditya Yadav <166515021+aditya0yadav@users.noreply.github.com>
---
 arch/sim/Kconfig                      | 1 +
 arch/sim/src/cmake/Toolchain.cmake    | 9 +++++++--
 arch/sim/src/sim/posix/sim_hostmisc.c | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

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>