porting this RA6T2 micro-ros library to RX26T

[dianyundou]

Issue template

• Hardware description:
• RTOS:
• Installation type:
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Steps to reproduce the issue

I did following changes in library_generation.sh 1、change arm-none-eabi-gcc to rx-elf-gcc in libmicroros.mk 1、change X_CC := arm-none-eabi-gcc X_CXX := arm-none-eabi-g++ into X_CC := rx-elf-gcc X_CXX := rx-elf-g++

Expected behavior

generate a micro ros library

Actual behavior

build error --- stderr: rcutils /home/feng/RoboticHandProject/MicroROS_RX26T2/micro_ros_renesas2estudio_component/libmicroros/micro_ros_src/src/rcutils/src/time_unix.c: In function ‘rcutils_system_time_now’: /home/feng/RoboticHandProject/MicroROS_RX26T2/micro_ros_renesas2estudio_component/libmicroros/micro_ros_src/src/rcutils/src/time_unix.c:65:7: error: implicit declaration of function ‘clock_gettime’ [-Wimplicit-function-declaration] 65 | if (clock_gettime(CLOCK_REALTIME, &timespec_now) < 0) { | ^~~~~~~~~~~~~ gmake[5]: *** [CMakeFiles/rcutils.dir/build.make:446: CMakeFiles/rcutils.dir/src/time_unix.c.obj] Error 1 gmake[4]: *** [CMakeFiles/Makefile2:192: CMakeFiles/rcutils.dir/all] Error 2 gmake[3]: *** [Makefile:146: all] Error 2

Failed <<< rcutils [4.29s, exited with code 2] make[2]: *** [libmicroros.mk:80: /home/feng/RoboticHandProject/MicroROS_RX26T2/micro_ros_renesas2estudio_component/library_generation/../libmicroros/micro_ros_src/install] Error 2 make[1]: [makefile:118: pre-build] Error 2 (ignored) Finished <<< ament_cmake_export_definitions [0.52s]

Additional information