clang samd51 compile but does not run, rom is correct, but ram is lacking bss. Got stkerr -> hardfault

examples/build_system/cmake/cpu/cortex-m0.cmake

@@ -7,7 +7,11 @@ if (TOOLCHAIN STREQUAL "gcc")
   set(FREERTOS_PORT GCC_ARM_CM0 CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "clang")
-  message(FATAL_ERROR "Clang is not supported for this target")
+  set(TOOLCHAIN_COMMON_FLAGS
+    --target=arm-none-eabi
+    -mcpu=cortex-m0plus
+    )
+  set(FREERTOS_PORT GCC_ARM_CM0 CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "iar")
   set(TOOLCHAIN_COMMON_FLAGS

examples/build_system/cmake/cpu/cortex-m23.cmake

@@ -7,7 +7,11 @@ if (TOOLCHAIN STREQUAL "gcc")
   set(FREERTOS_PORT GCC_ARM_CM23_NTZ_NONSECURE CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "clang")
-  message(FATAL_ERROR "Clang is not supported for this target")
+  set(TOOLCHAIN_COMMON_FLAGS
+    --target=arm-none-eabi
+    -mcpu=cortex-m23
+    )
+  set(FREERTOS_PORT GCC_ARM_CM23_NTZ_NONSECURE CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "iar")
   set(TOOLCHAIN_COMMON_FLAGS

examples/build_system/cmake/cpu/cortex-m3.cmake

@@ -6,7 +6,11 @@ if (TOOLCHAIN STREQUAL "gcc")
   set(FREERTOS_PORT GCC_ARM_CM3 CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "clang")
-  message(FATAL_ERROR "Clang is not supported for this target")
+  set(TOOLCHAIN_COMMON_FLAGS
+    --target=arm-none-eabi
+    -mcpu=cortex-m3
+    )
+  set(FREERTOS_PORT GCC_ARM_CM3 CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "iar")
   set(TOOLCHAIN_COMMON_FLAGS

examples/build_system/cmake/cpu/cortex-m33.cmake

@@ -8,7 +8,12 @@ if (TOOLCHAIN STREQUAL "gcc")
   set(FREERTOS_PORT GCC_ARM_CM33_NTZ_NONSECURE CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "clang")
-  message(FATAL_ERROR "Clang is not supported for this target")
+  set(TOOLCHAIN_COMMON_FLAGS
+    --target=arm-none-eabi
+    -mcpu=cortex-m33
+    -mfpu=fpv5-sp-d16
+    )
+  set(FREERTOS_PORT GCC_ARM_CM33_NTZ_NONSECURE CACHE INTERNAL "")
 
 elseif (TOOLCHAIN STREQUAL "iar")
   set(TOOLCHAIN_COMMON_FLAGS

examples/build_system/cmake/toolchain/common.cmake

@@ -31,11 +31,13 @@ if (TOOLCHAIN STREQUAL "gcc")
     -Wl,--gc-sections
     -Wl,--cref
     )
+
 elseif (TOOLCHAIN STREQUAL "iar")
   #list(APPEND TOOLCHAIN_COMMON_FLAGS)
   list(APPEND TOOLCHAIN_EXE_LINKER_FLAGS
     --diag_suppress=Li065
     )
+
 elseif (TOOLCHAIN STREQUAL "clang")
   list(APPEND TOOLCHAIN_COMMON_FLAGS
     -fdata-sections
@@ -45,7 +47,7 @@ elseif (TOOLCHAIN STREQUAL "clang")
   list(APPEND TOOLCHAIN_EXE_LINKER_FLAGS
     -Wl,--print-memory-usage
     -Wl,--gc-sections
-    #-Wl,--cref
+    -Wl,--cref
     )
 endif ()
 

hw/bsp/family_support.cmake

@@ -219,8 +219,9 @@ function(family_configure_common TARGET RTOS)
     if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 12.0)
       target_link_options(${TARGET} PUBLIC "LINKER:--no-warn-rwx-segments")
     endif ()
-  endif()
-  if (CMAKE_C_COMPILER_ID STREQUAL "IAR")
+ elseif (CMAKE_C_COMPILER_ID STREQUAL "Clang")
+    target_link_options(${TARGET} PUBLIC "LINKER:-Map=$<TARGET_FILE:${TARGET}>.map")
+  elseif (CMAKE_C_COMPILER_ID STREQUAL "IAR")
     target_link_options(${TARGET} PUBLIC "LINKER:--map=$<TARGET_FILE:${TARGET}>.map")
   endif()
 

hw/bsp/samd51/family.cmake

@@ -1,6 +1,7 @@
 include_guard()
 
 set(SDK_DIR ${TOP}/hw/mcu/microchip/samd51)
+set(CMSIS_5 ${TOP}/lib/CMSIS_5)
 
 # include board specific
 include(${CMAKE_CURRENT_LIST_DIR}/boards/${BOARD}/board.cmake)
@@ -18,6 +19,16 @@ set(OPENOCD_OPTION "-f interface/cmsis-dap.cfg -c \"transport select swd\" -c \"
 # only need to be built ONCE for all examples
 function(add_board_target BOARD_TARGET)
   if (NOT TARGET ${BOARD_TARGET})
+    set(LD_FILE_Clang ${LD_FILE_GNU})
+    if (NOT DEFINED LD_FILE_${CMAKE_C_COMPILER_ID})
+      message(FATAL_ERROR "LD_FILE_${CMAKE_C_COMPILER_ID} not defined")
+    endif ()
+
+    if (NOT DEFINED STARTUP_FILE_${CMAKE_C_COMPILER_ID})
+      set(STARTUP_FILE_GNU ${SDK_DIR}/gcc/gcc/startup_samd51.c)
+      set(STARTUP_FILE_Clang ${STARTUP_FILE_GNU})
+    endif ()
+
     add_library(${BOARD_TARGET} STATIC
       ${SDK_DIR}/gcc/system_samd51.c
       ${SDK_DIR}/hpl/gclk/hpl_gclk.c
@@ -25,6 +36,7 @@ function(add_board_target BOARD_TARGET)
       ${SDK_DIR}/hpl/osc32kctrl/hpl_osc32kctrl.c
       ${SDK_DIR}/hpl/oscctrl/hpl_oscctrl.c
       ${SDK_DIR}/hal/src/hal_atomic.c
+      ${STARTUP_FILE_${CMAKE_C_COMPILER_ID}}
       )
     target_include_directories(${BOARD_TARGET} PUBLIC
       ${SDK_DIR}/
@@ -34,29 +46,22 @@ function(add_board_target BOARD_TARGET)
       ${SDK_DIR}/hal/utils/include
       ${SDK_DIR}/hpl/port
       ${SDK_DIR}/hri
-      ${SDK_DIR}/CMSIS/Include
+      ${CMSIS_5}/CMSIS/Core/Include
       )
 
     update_board(${BOARD_TARGET})
 
-    if (NOT DEFINED LD_FILE_${CMAKE_C_COMPILER_ID})
-      message(FATAL_ERROR "LD_FILE_${CMAKE_C_COMPILER_ID} not defined")
-    endif ()
-
-    if (NOT DEFINED STARTUP_FILE_${CMAKE_C_COMPILER_ID})
-      set(STARTUP_FILE_GNU ${SDK_DIR}/gcc/gcc/startup_samd51.c)
-    endif ()
-
-    target_sources(${BOARD_TARGET} PRIVATE
-      ${STARTUP_FILE_${CMAKE_C_COMPILER_ID}}
-      )
-
     if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
       target_link_options(${BOARD_TARGET} PUBLIC
         "LINKER:--script=${LD_FILE_GNU}"
         -nostartfiles
         --specs=nosys.specs --specs=nano.specs
         )
+    elseif (CMAKE_C_COMPILER_ID STREQUAL "Clang")
+      target_link_options(${BOARD_TARGET} PUBLIC
+        "LINKER:--script=${LD_FILE_Clang}"
+        #"LINKER:-lcrt0"
+        )
     elseif (CMAKE_C_COMPILER_ID STREQUAL "IAR")
       target_link_options(${BOARD_TARGET} PUBLIC
         "LINKER:--config=${LD_FILE_IAR}"