Update m0 compiler version (#490)

* Update m0 compiler version

* Update mcpu flag

* Update libmicroros for test

* Revert "Update libmicroros for test"

This reverts commit a6c53d8.

Author: Acuadros95

extras/library_generation/cortex_m0_toolchain.cmake

@@ -8,7 +8,7 @@ set(CMAKE_CXX_COMPILER $ENV{TOOLCHAIN_PREFIX}g++)
 SET(CMAKE_C_COMPILER_WORKS 1 CACHE INTERNAL "")
 SET(CMAKE_CXX_COMPILER_WORKS 1 CACHE INTERNAL "")
 
-set(FLAGS "-O2 -fsingle-precision-constant -ffunction-sections -fdata-sections -fno-exceptions -mcpu=cortex-m0 -nostdlib  -mthumb -D'RCUTILS_LOG_MIN_SEVERITY=RCUTILS_LOG_MIN_SEVERITY_NONE'" CACHE STRING "" FORCE)
+set(FLAGS "-O2 -fsingle-precision-constant -ffunction-sections -fdata-sections -fno-exceptions -mcpu=cortex-m0plus -nostdlib  -mthumb -D'RCUTILS_LOG_MIN_SEVERITY=RCUTILS_LOG_MIN_SEVERITY_NONE'" CACHE STRING "" FORCE)
 
 set(CMAKE_C_FLAGS_INIT "-std=c11 ${FLAGS} -DCLOCK_MONOTONIC=0 -D'__attribute__(x)='" CACHE STRING "" FORCE)
 set(CMAKE_CXX_FLAGS_INIT "-std=c++14 ${FLAGS} -fno-rtti -DCLOCK_MONOTONIC=0 -D'__attribute__(x)='" CACHE STRING "" FORCE)

extras/library_generation/library_generation.sh

@@ -77,7 +77,7 @@ fi
 if [[ " ${PLATFORMS[@]} " =~ " cortex_m0 " ]]; then
     rm -rf firmware/build
 
-    export TOOLCHAIN_PREFIX=/uros_ws/gcc-arm-none-eabi-5_4-2016q3/bin/arm-none-eabi-
+    export TOOLCHAIN_PREFIX=/uros_ws/gcc-arm-none-eabi-7-2017-q4-major/bin/arm-none-eabi-
     ros2 run micro_ros_setup build_firmware.sh /project/extras/library_generation/cortex_m0_toolchain.cmake /project/extras/library_generation/colcon_verylowmem.meta
 
     find firmware/build/include/ -name "*.c"  -delete