CMakeList: Disable gapfill for RX target

Ignore gapfill for RX target as some RX toolchains generate wrong
output image when running gapfill for binary format.

Signed-off-by: Duy Nguyen <duy.nguyen.xa@renesas.com>

Author: duynguyenxa

CMakeLists.txt

@@ -1701,8 +1701,12 @@ list(APPEND
 list(APPEND post_build_byproducts ${KERNEL_MAP_NAME})
 
 # Use ';' as separator to get proper space in resulting command.
-set(gap_fill_prop "$<TARGET_PROPERTY:bintools,elfconvert_flag_gapfill>")
-set(gap_fill "$<$<BOOL:${gap_fill_prop}>:${gap_fill_prop}${CONFIG_BUILD_GAP_FILL_PATTERN}>")
+# Ignore gapfill for RX target as some RX toolchains generate wrong output image when running
+# gapfill for binary format.
+if(NOT CONFIG_RX)
+  set(gap_fill_prop "$<TARGET_PROPERTY:bintools,elfconvert_flag_gapfill>")
+  set(gap_fill "$<$<BOOL:${gap_fill_prop}>:${gap_fill_prop}${CONFIG_BUILD_GAP_FILL_PATTERN}>")
+endif()
 
 if(CONFIG_OUTPUT_PRINT_MEMORY_USAGE)
   target_link_libraries(${logical_target_for_zephyr_elf} $<TARGET_PROPERTY:linker,memusage>)