CMake: Fix GCC_ARM pre-linking stage (#13575)

Make it generic for all targets. It was previously hardcoded for K64F

Author: 0xc0170

CMakeLists.txt

@@ -75,21 +75,13 @@ endfunction()
 # Specifies linker script used for linking `target`.
 #
 function(mbed_set_mbed_target_linker_script target)
-    get_property(mbed_target_startup GLOBAL PROPERTY MBED_TARGET_LINKER_FILE)
-
-    # TODO: @mbed-os-tools This pre-build commands should get details from target + profile.
+    get_property(mbed_target_linker_script GLOBAL PROPERTY MBED_TARGET_LINKER_FILE)
+    mbed_generate_gcc_options_for_linker(${target} _linker_preprocess_definitions _linker_preprocess_options)
     if(MBED_TOOLCHAIN STREQUAL "GCC_ARM")
         set(CMAKE_PRE_BUILD_COMMAND
             COMMAND "arm-none-eabi-cpp" -E -P
-                -Wl,--gc-sections -Wl,--wrap,main -Wl,--wrap,_malloc_r -Wl,--wrap,_free_r
-                -Wl,--wrap,_realloc_r -Wl,--wrap,_memalign_r -Wl,--wrap,_calloc_r
-                -Wl,--wrap,exit -Wl,--wrap,atexit -Wl,-n
-                -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp
-                -DMBED_ROM_START=0x0 -DMBED_ROM_SIZE=0x100000 -DMBED_RAM_START=0x20000000
-                -DMBED_RAM_SIZE=0x30000 -DMBED_RAM1_START=0x1fff0000
-                -DMBED_RAM1_SIZE=0x10000 -DMBED_BOOT_STACK_SIZE=1024
-                -DXIP_ENABLE=0
-                ${mbed_target_startup} -o ${CMAKE_BINARY_DIR}/${target}.link_script.ld
+                ${_linker_preprocess_options} ${_linker_preprocess_definitions}
+                ${mbed_target_linker_script} -o ${CMAKE_BINARY_DIR}/${target}.link_script.ld
 
             WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
             BYPRODUCTS "${CMAKE_BINARY_DIR}/${target}.link_script.ld"
@@ -98,7 +90,7 @@ function(mbed_set_mbed_target_linker_script target)
         set(CMAKE_PRE_BUILD_COMMAND COMMAND "")
         target_link_options(mbed-os
             PUBLIC
-                "--scatter=${mbed_target_startup}"
+                "--scatter=${mbed_target_linker_script}"
         )
     endif()
     add_custom_command(

cmake/toolchains/GCC_ARM.cmake

@@ -55,3 +55,23 @@ function(mbed_set_toolchain_options target)
             ${link_options}
     )
 endfunction()
+
+# GCC ARM requires preprecessing linker script, execute generators to get definitions needed for
+# this step - linker options and compile definitions 
+function(mbed_generate_gcc_options_for_linker target definitions_file linker_options_file)
+    set(_compile_definitions 
+        "$<TARGET_PROPERTY:${target},COMPILE_DEFINITIONS>"
+    )
+
+    set(_linker_options
+        "$<TARGET_PROPERTY:${target},LINK_OPTIONS>"
+    )
+
+    set(_compile_definitions 
+        "$<$<BOOL:${_compile_definitions}>:-D$<JOIN:${_compile_definitions}, -D>>"
+    )
+    file(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/compile_time_defs.txt" CONTENT "${_compile_definitions}\n")
+    file(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/linker_options.txt" CONTENT "${_linker_options}\n")
+    set(definitions_file @${CMAKE_BINARY_DIR}/compile_time_defs.txt)
+    set(linker_options_file @${CMAKE_BINARY_DIR}/linker_options.txt)
+endfunction()