#! /bin/bash

# Checks for conflicts between all dll's that are loaded by the programs or dlls given as arguments.
# cygcheck searches PATH to find arguments that are not absolute pathnames.
 
final_dec=0
final_guard_dec=0
guard=0x10000

#set -x

cygcheck "$@" |
while read -r file
do
 [ -n "$file" ] && [ "$file" = "${file#Found:}" ] && objdump -p "$file" | 
   sed -n -e '2 {s:\\:/:g; s/^/ /; s/: .*$//; h}' -e '/ImageBase/ {s/ImageBase/ /; G; h}' -e '/SizeOfImage/ {s/SizeOfImage//; G; s/[\t\n]//gp; Q}'
done |
sort -f -u -k 2 |
while read size base name
do
  conflict=""
  base_dec=$(( 0x$base ))
  if [ "$final_dec" -ge "$base_dec" ] 
  then
    conflict="CONFLICT End: $final_dec Start:$base_dec"
  else
    [ "$final_guard_dec" -ge "$base_dec" ] && conflict="GUARD CONFLICT End: $final_dec Start:$base_dec"
  fi
  echo $name $base $size $conflict
  final_dec=$(( 0x$base + 0x$size  ))
  final_guard_dec=$(( $final_dec + $guard ))
done

#! /bin/bash

final_dec=0
final_guard_dec=0
guard=0x10000

#set -x

cygcheck "$1" |
while read -r file
do
 /usr/bin/objdump -p "$file" | 
   sed -n -e '2 {s/^/ /; s/: .*$//; h}' -e '/ImageBase/ {s/ImageBase/ /; G; h}' -e '/SizeOfImage/ {s/SizeOfImage//; G; s/[\t\n]//gp; Q}'
done |
sort -k 2 |
while read -r size base name
do
  conflict=""
  base_dec=$(( 0x$base ))
  if [ "$final_dec" -ge "$base_dec" ] 
  then
    conflict="CONFLICT End: $final_dec Start:$base_dec"
  else
    [ "$final_guard_dec" -ge "$base_dec" ] && conflict="GUARD CONFLICT End: $final_dec Start:$base_dec"
  fi
  echo $name $base $size $conflict
  final_dec=$(( 0x$base + 0x$size  ))
  final_guard_dec=$(( $final_dec + $guard ))
done

From: "Pierre A. Humblet" 
The attached script takes the name of a .exe or .dll,
uses cygcheck to find the dll dependence and checks for conflicts.

This will allow you to check your favorite applications or dlls,
seeing if --enable-auto-image-base works for you.

A "conflict" is when the end of a dll overlaps the start of the next one.
A "guard conflict" includes the extra 0x10000 mentioned by Jason in this thread.
They occur with Windows dlls, not sure if that's a real issue.

I have extended the tool (attached) so that it takes a variable number
of arguments. You can check a program and all the dll's it might ever
load dynamically, or all the dll's in /bin, or whatever. 
cygcheck will search the PATH if necessary.

Check cygwin apps for base conflicts

Bash