Re: Observation for ALL maintainers who provide dlls (was Re: question for perl maintainer)

["Pierre A. Humblet" <pierre at phumblet dot no-ip dot org>]

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.

Here is an example output:

~: check_bases /usr/sbin/sshd.exe 
C:/progra~1/cygwin/usr/sbin/sshd.exe 00400000 0004b000
C:\progra~1\cygwin\bin\cygcrypt-0.dll 10000000 00007000
C:\progra~1\cygwin\bin\cygz.dll 10000000 00015000 CONFLICT End: 268464128 Start:268435456
C:\progra~1\cygwin\bin\cygwin1.dll 61000000 00259000
C:\progra~1\cygwin\bin\cygcrypto-0.9.8.dll 63000000 0010a000
C:\WINDOWS\system32\ADVAPI32.DLL 77dd0000 0009b000
C:\WINDOWS\system32\RPCRT4.dll 77e70000 00091000 GUARD CONFLICT End: 2011607040 Start:2011627520
C:\WINDOWS\system32\KERNEL32.dll 7c800000 000f4000
C:\WINDOWS\system32\ntdll.dll 7c900000 000b0000 GUARD CONFLICT End: 2089762816 Start:2089811968

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.

Here is a more complex one:
~: check_bases /bin/exim-4.52-1.exe 
C:/progra~1/cygwin/bin/exim-4.52-1.exe 00400000 000c2000
C:/progra~1/cygwin/bin\cygcrypto-0.9.7.dll 0fe00000 000dd000
C:/progra~1/cygwin/bin\cygcrypt-0.dll 10000000 00007000
C:/progra~1/cygwin/bin\cyggdbm-4.dll 10000000 0000d000 CONFLICT End: 268464128 Start:268435456
C:/progra~1/cygwin/bin\cyglber-2-2-7.dll 10000000 0000f000 CONFLICT End: 268488704 Start:268435456
C:/progra~1/cygwin/bin\cygsasl2-2.dll 10000000 00018000 CONFLICT End: 268496896 Start:268435456
C:/progra~1/cygwin/bin\cygssl-0.9.7.dll 10000000 0002f000 CONFLICT End: 268533760 Start:268435456
C:/progra~1/cygwin/bin\cygldap-2-2-7.dll 10000000 00031000 CONFLICT End: 268627968 Start:268435456
C:/progra~1/cygwin/bin\cygssl-0.9.8.dll 10000000 00039000 CONFLICT End: 268636160 Start:268435456
C:/progra~1/cygwin/bin\cygiconv-2.dll 10000000 000f2000 CONFLICT End: 268668928 Start:268435456
C:/progra~1/cygwin/bin\cygwin1.dll 61000000 00259000
C:/progra~1/cygwin/bin\cygcrypto-0.9.8.dll 63000000 0010a000
C:/progra~1/cygwin/bin\cygminires.dll 6dcc0000 0000b000
C:\WINDOWS\system32\ADVAPI32.DLL 77dd0000 0009b000
C:\WINDOWS\system32\RPCRT4.dll 77e70000 00091000 GUARD CONFLICT End: 2011607040 Start:2011627520
C:\WINDOWS\system32\KERNEL32.dll 7c800000 000f4000
C:\WINDOWS\system32\ntdll.dll 7c900000 000b0000 GUARD CONFLICT End: 2089762816 Start:2089811968

Pierre

Attachment: check_bases
Description: Text document