Query regarding compiling with --enable-debug

From time to time I do some debugging on the code and compile using the 
autogen flag --enable-debug flag

When I compiled at the end of last week I was surprised that the log 
file that I generated, from the compile, had increased from 932,600 
bytes to a massive 444,815,895 bytes! I don't know whether this has 
always been the case and I've just not noticed before.

Inspecting the log file from the compile I did using the --enable-debug 
flag I found 3,591,051 lines starting with info:sal.file whereas on the 
compile without the --enable-debug flag I get no lines starting with 
info:sal.file.

Below is a snippet from the log file

> info:sal.file:10686:1:sal/osl/unx/file.cxx:1032: 
> osl_openFile(/tmp/gbuild.AJ1Np5, readonly) => 3
> info:sal.file:10686:1:sal/osl/unx/file.cxx:1032: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/beans/PropertySet.idl, 
> readonly) => 4
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/beans/com/sun/star/beans/XPropertySet.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/com/sun/star/beans/XPropertySet.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/sun/com/sun/star/beans/XPropertySet.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/com/sun/star/beans/XPropertySet.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:1032: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/beans/XPropertySet.idl, 
> readonly) => 5
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/beans/com/sun/star/uno/XInterface.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/com/sun/star/uno/XInterface.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/sun/com/sun/star/uno/XInterface.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/com/sun/star/uno/XInterface.idl, 
> readonly) failed: No such file or directory
> info:sal.file:10686:1:sal/osl/unx/file.cxx:1032: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/uno/XInterface.idl, 
> readonly) => 6
> info:sal.file:10686:1:sal/osl/unx/file.cxx:1074: 
> osl_closeFile(/home/master/master/udkapi/com/sun/star/uno/XInterface.idl:6)
> info:sal.file:10686:1:sal/osl/unx/file.cxx:941: 
> osl_openFile(/home/master/master/udkapi/com/sun/star/beans/com/sun/star/beans/XPropertySetInfo.idl, 
> readonly) failed: No such file or directory

What are these lines telling me and should I be concerned?

On the whole I still seem to be able to debug, add breakpoints and print 
variables in the places I want to debug.

Alex