Tool to analyze size of ELF sections and symbol

Question

I need a way to analyze output file of my GCC compiler for ARM. I am compiling for bare metal and I am quite concerned with size. I can use arm-none-eabi-objdump

Answer 1

You can use nm and size to get the size of functions and ELF sections.

To get the size of the functions (and objects with static storage duration):

$ nm --print-size --size-sort --radix=d tst.o

The second column shows the size in decimal of function and objects.

To get the size of the sections:

$ size -A -d tst.o

The second column shows the size in decimal of the sections.

Answer 2

puncover uses objdump and a few other gcc tools to generate html pages you can easily browse to figure out where your code and data space is going.

It's a much nicer frontend than the text output of the gcc tools.

Answer 3

The readelf utility is handy for displaying a variety of section information, including section sizes, e.g.:

arm-none-eabi-readelf -e foo.o

If you're interested in the run-time memory footprint, you can ignore the sections that do not have the 'A' (allocate) flag set.