CMake post-build output command with print - c

Question

I'm using CLion 1.2 to build an embedded C project for an STM32 target. Cross compilation using GNU ARM tools works well, however, I would like to run arm-none-eabi-size after the executable file has been built, and have the output of that command be printed to the build output window.
I have had a thorough look at the add_custom_command macro, however, I do not intend on generating an output file, which is what the macro appears to do.
Below is the CMakeLists.txt that I am using in the project:
cmake_minimum_required(VERSION 3.3)
include(CMakeForceCompiler)
project(rtos_clion)
# -------------------------------------------------------------------
set(CMAKE_SYSTEM_PROCESSOR cortex-m0)
SET(CMAKE_SYSTEM_NAME Generic)
# Target Environment
SET(CMAKE_FIND_ROOT_PATH "C:/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2")
# Cross compiler
CMAKE_FORCE_C_COMPILER(arm-none-eabi-gcc GNU)
CMAKE_FORCE_CXX_COMPILER(arm-none-eabi-g++ GNU)
# Executable type
set(CMAKE_EXECUTABLE_SUFFIX ".elf")
# Compiler flags
set(ARM_FLAGS "-mcpu=cortex-m0 -mthumb -Os")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARM_FLAGS} -std=gnu++11 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -ffunction-sections -g")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11 ${ARM_FLAGS} -ffunction-sections -fmessage-length=0 -fsigned-char -fdata-sections -ffreestanding -fno-move-loop-invariants -Wall -Wextra -g")
set(CMAKE_EXE_LINKER_FLAGS "${ARM_FLAGS} -g -Wl,--library-path=\"${PROJECT_SOURCE_DIR}\" -T mem.ld -T libs.ld -T sections.ld -Xlinker --gc-sections -Wl,-Map=${PROJECT_NAME}.map --specs=nano.specs")
set(CMAKE_C_LINK_EXECUTABLE "<CMAKE_C_COMPILER> <LINK_FLAGS> -o <TARGET> <OBJECTS>")
set(CMAKE_CXX_LINK_EXECUTABLE "<CMAKE_CXX_COMPILER> <LINK_FLAGS> -o <TARGET> <OBJECTS>")
# -------------------------------------------------------------------
# Global definitions
add_definitions(-DDEBUG -DUSE_FULL_ASSERT -DSTM32F051x8 -DHSE_VALUE=8000000)
include_directories(
# My include directories
)
set(SOURCE_FILES
# My source files
)
add_executable(${PROJECT_NAME} ${SOURCE_FILES})
# search for programs in the build host directories
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
This is what arm-none-eabi-size prints when executed in a console:
$arm-none-eabi-size --format=berkeley "rtos_clion.elf"
text data bss dec hex filename
32840 308 7796 40944 9ff0 rtos_clion.elf
How would I have that run and have that output displayed in the build window?
Thanks!

Answer 1

Just use TARGET flow of add_custom_command:
add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD
COMMAND arm-none-eabi-size --format=berkeley "rtos_clion.elf")
The command will be executed after executable has been (re)built.

Answer 2

Even the .elf file can be taken from a variable:
set_target_properties(${TARGET} PROPERTIES SUFFIX ".elf")
add_custom_command(TARGET ${MAIN_TARGET} POST_BUILD
COMMAND arm-none-eabi-size --format=berkeley --totals "$<TARGET_FILE:${TARGET}>"
COMMENT "Invoking: Cross ARM GNU Print Size")