#!/bin/bash
# nmdiff BIN1 BIN2 - compare two binaries by symbol size

# 13apr2016  +chris+  support Go programs with whitespace in indentifiers
# 13apr2016  +chris+  show missing/new symbols

nmsize() {
	nm -S -t d "$1" | sed 's/^[^ ]* //; /^[^0]/d; s/ /\t/; s/ /\t/'
}

join -t'	' -a1 -a2 -j3 -e0 -o0,1.1,1.2,2.1,2.2 <(nmsize "$1") <(nmsize "$2") |
	awk 'BEGIN { FS=OFS="\t" }
	     { $1 = substr($1, 1, 60); $6 = $2 - $4; if ($6 != 0) print }' |
	sort -n -k 6 |
	column -t -s '	'