cmake: support pre-processor for linker script

CMakeLists.txt

@@ -250,6 +250,15 @@ else()
   file(TOUCH ${CMAKE_BINARY_DIR}/drivers/platform/Kconfig)
 endif()
 
+# board common directory
+
+if(CONFIG_ARCH_BOARD_COMMON)
+  file(
+    GLOB NUTTX_COMMON_DIR
+    LIST_DIRECTORIES true
+    "${NUTTX_DIR}/boards/${CONFIG_ARCH}/${CONFIG_ARCH_CHIP}/common")
+endif()
+
 # Custom chip ###################################################
 
 if(CONFIG_ARCH_CHIP_CUSTOM)
@@ -521,6 +530,28 @@ endif()
 # Get linker script to use
 get_property(ldscript GLOBAL PROPERTY LD_SCRIPT)
 
+# Pre-compile linker script
+if(DEFINED PREPROCES)
+  get_filename_component(LD_SCRIPT_NAME ${ldscript} NAME)
+  set(LD_SCRIPT_TMP "${CMAKE_BINARY_DIR}/${LD_SCRIPT_NAME}.tmp")
+
+  add_custom_command(
+    OUTPUT ${LD_SCRIPT_TMP}
+    DEPENDS ${ldscript}
+    COMMAND
+      ${PREPROCES}
+      -I${CMAKE_BINARY_DIR}/include
+      -I${NUTTX_CHIP_ABS_DIR}
+      ${ldscript} > ${LD_SCRIPT_TMP}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  )
+
+  add_custom_target(ldscript_tmp DEPENDS ${LD_SCRIPT_TMP})
+  add_dependencies(nuttx ldscript_tmp)
+
+  set(ldscript ${LD_SCRIPT_TMP})
+endif()
+
 # Perform link
 
 # Add empty source file to nuttx target since cmake requires at least one file
@@ -703,10 +734,3 @@ if(NOT CONFIG_BUILD_FLAT)
 
   # TODO: could also merge elf binaries
 endif()
-
-if(CONFIG_ARCH_BOARD_COMMON)
-  file(
-    GLOB NUTTX_COMMON_DIR
-    LIST_DIRECTORIES true
-    "${NUTTX_DIR}/boards/${CONFIG_ARCH}/${CONFIG_ARCH_CHIP}/common")
-endif()

arch/arm/src/cmake/platform.cmake

@@ -101,3 +101,5 @@ if(CONFIG_ARCH_COVERAGE)
 endif()
 
 set_property(GLOBAL APPEND PROPERTY NUTTX_EXTRA_LIBRARIES ${EXTRA_LIB})
+
+set(PREPROCES ${CMAKE_C_COMPILER} ${CMAKE_C_FLAGS} -E -P -x c)