fix(system): discard eh_frame sections if disabled in sdkconfig

components/esp_system/ld/ld.cmake

@@ -1,33 +1,51 @@
-# For each supported target, a memory.ld.in and sections.ld.in is processed and dictate the
-# memory layout of the app.
-#
-# memory.ld.in goes through the preprocessor
-# sections.ld.in goes through linker script generator
-
 idf_build_get_property(target IDF_TARGET)
 idf_build_get_property(sdkconfig_header SDKCONFIG_HEADER)
-
-set(ld_input "${CMAKE_CURRENT_LIST_DIR}/${target}/memory.ld.in")
-set(ld_output "${CMAKE_CURRENT_BINARY_DIR}/ld/memory.ld")
-target_linker_script(${COMPONENT_LIB} INTERFACE "${ld_output}")
+idf_build_get_property(config_dir CONFIG_DIR)
 
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/ld")
 
-# Process the template file through the linker script generation mechanism, and use the output for linking the
-# final binary
-target_linker_script(${COMPONENT_LIB} INTERFACE "${CMAKE_CURRENT_LIST_DIR}/${target}/sections.ld.in"
+# Cmake script that generates linker script from "*.ld.in" scripts using compiler preprocessor
+set(linker_script_generator "${CMAKE_CURRENT_BINARY_DIR}/ld/linker_script_generator.cmake")
+file(WRITE ${linker_script_generator}
+[=[
+execute_process(COMMAND "${CC}" "-C" "-P" "-x" "c" "-E" "-I" "${CONFIG_DIR}" "-I" "${LD_DIR}" "${SOURCE}"
+                RESULT_VARIABLE RET_CODE
+                OUTPUT_VARIABLE PREPROCESSED_LINKER_SCRIPT
+                ERROR_VARIABLE ERROR_VAR)
+if(RET_CODE AND NOT RET_CODE EQUAL 0)
+    message(FATAL_ERROR "Can't generate ${TARGET}\nRET_CODE: ${RET_CODE}\nERROR_MESSAGE: ${ERROR_VAR}")
+endif()
+string(REPLACE "\\n" "\n" TEXT "${PREPROCESSED_LINKER_SCRIPT}")
+file(WRITE "${TARGET}" "${TEXT}")
+]=])
+
+function(preprocess_linker_file name_in name_out out_path)
+    set(script_in "${CMAKE_CURRENT_LIST_DIR}/${target}/${name_in}")
+    set(script_out "${CMAKE_CURRENT_BINARY_DIR}/ld/${name_out}")
+    set(${out_path} ${script_out} PARENT_SCOPE)
+
+    add_custom_command(
+        OUTPUT ${script_out}
+        COMMAND ${CMAKE_COMMAND}
+            "-DCC=${CMAKE_C_COMPILER}"
+            "-DSOURCE=${script_in}"
+            "-DTARGET=${script_out}"
+            "-DCONFIG_DIR=${config_dir}"
+            "-DLD_DIR=${CMAKE_CURRENT_LIST_DIR}"
+            -P "${linker_script_generator}"
+        MAIN_DEPENDENCY ${script_in}
+        DEPENDS ${sdkconfig_header}
+        COMMENT "Generating ${script_out} linker script..."
+        VERBATIM)
+    add_custom_target("${name_out}" DEPENDS "${script_out}")
+    add_dependencies(${COMPONENT_LIB} "${name_out}")
+endfunction()
+
+# Generage memory.ld
+preprocess_linker_file("memory.ld.in" "memory.ld" ld_out_path)
+target_linker_script(${COMPONENT_LIB} INTERFACE "${ld_out_path}")
+
+# Generage sections.ld.in and pass it through linker script generator
+preprocess_linker_file("sections.ld.in" "sections.ld.in" ld_out_path)
+target_linker_script(${COMPONENT_LIB} INTERFACE "${ld_out_path}"
                     PROCESS "${CMAKE_CURRENT_BINARY_DIR}/ld/sections.ld")
-
-idf_build_get_property(config_dir CONFIG_DIR)
-# Preprocess memory.ld.in linker script to include configuration, becomes memory.ld
-add_custom_command(
-    OUTPUT ${ld_output}
-    COMMAND "${CMAKE_C_COMPILER}" -C -P -x c -E -o ${ld_output} -I ${config_dir}
-            -I "${CMAKE_CURRENT_LIST_DIR}" ${ld_input}
-    MAIN_DEPENDENCY ${ld_input}
-    DEPENDS ${sdkconfig_header}
-    COMMENT "Generating memory.ld linker script..."
-    VERBATIM)
-
-add_custom_target(memory_ld DEPENDS ${ld_output})
-add_dependencies(${COMPONENT_LIB} memory_ld)