How to display the amount of memory occupied in the microcontroller (avr-gcc)?

Question

Microcontrollers

If in atmel studio the output immediately indicates how much RAM the variables occupy, how much ROM is left, then using only avr-gcc this is not clear. If the ROM can be determined by the size of the hex file, then here are the questions with the RAM. Maybe you need some kind of Linux utility for this?

Here's what I'm using:

avr-gcc -Wall -mmcu=atmega328p -O1 -funsigned-char ./SRC/main.c ./SRC/uart.c ./SRC/main.h ./SRC/uart.h -o ./BIN/output.elf
avr-objcopy -O ihex ./BIN/output.elf ./BIN/output.hex

Answer 1

Sizes like avr-size shows.