[CMake] BundleUtilities not working

[Bill Somerville]

Hi,

I am suffering issues with BundleUtilities fixup_bundle() when used on 
Windows with MinGW. The issue is because the underlying GetPrerequisites 
module uses the MS dumpbin.exe utility to find dependent libraries of 
executables. This is a problem because it crashes on many libraries and 
executables from later MinGW tools, for example the GNU Fortran library 
libgfortran-3.dll. I believe the crash is due to the DLL having no symbols.

The problem is exacerbated by GetPrequisites having very little error 
checking so it silently fails and doesn't install the dependent libraries.

GetPrerequisites can use objdump if dumpbin is not available but this 
has another issue. The output from 'objdump -p <executable>' can be very 
long, over 10000+ lines for a large Qt library for example, and this 
causes GetPrerequsites to run exceedingly slowly as it uses 
execute_process() to capture the output into a CMake variable then 
parses it with string(REGEX REPLACE ...) and a loop doing an if(... 
MATCHES <regexp>) on every line.

So I have a choice of broken or too slow for practical use :(

Is BundleUtilities.cmake and GetPrerequisites.cmake maintained, if so 
who by? I can suggest a few improvements, the main one being to filter 
the command output used to get prerequisites in a pipeline 
(execute_command() with multiple commands using grep) and better error 
checking. Also perhaps dumpbin should only be used if objdump is not 
available.

Regards
Bill Somerville.