It has always been made quite clear that calling
cppu::getCaughtException will only work under tightly restricted
circumstances
(<http://udk.openoffice.org/source/browse/udk/cppuhelper/inc/cppuhelper/exc_hlp.hxx?rev=1.9&view=markup>).
It appears that the combination of two recent changes (the switch to
Microsoft .Net 2005/2008 compilers together with the Three-Layer Office)
has killed this feature completely, however.
Debugging <http://www.openoffice.org/issues/show_bug.cgi?id=88671> (of
which <http://www.openoffice.org/issues/show_bug.cgi?id=88460> is
probably a duplicate) shows the following: On a Windows machine where
the relevant compiler runtime libraries are not installed system wide
(msvcr90.dll in the case of the .Net 2008 compiler, OOo code wntmsci12),
msvcr90.dll is loaded multiple times into the process (it has to be
present in both the URE\bin and Basis 3.0\program directories; otherwise
soffice would not even start), and an exception thrown at
desktop/source/deployment/registry/dp_registry.cxx:1.12 l. 486 causes a
crash when it is caught one stack frame up at
desktop/source/deployment/registry/package/dp_package.cxx:1.26 l. 1187
and cppu::getCaughtException is called. This appears to be due to the
fact that cppuhelper3MSC.dll and/or msci_uno.dll (implementing
cppu::getCaughtException) are located in the URE\bin layer and use the
instance of msvcr90.dll loaded from there while deploymentmi.uno.dll
(implementing the desktop/source/deployment code) is located in the
Basis 3.0\program layer and uses the other (identical) instance of
msvcr90.dll loaded from there.
I do not see any elegant solution for this problem. Potential but ugly
solutions would include:
- Remove all calls of the---dangerous anyway---cppu::getCaughtException
from the OOo code base
(<http://lxr.go-oo.org/ident?i=getCaughtException> lists "245 references
in 102 files").
- Make sure the relevant compiler runtime libraries will always be
installed system wide when running OOo. (This had been discussed
before, but dismissed.)
- Use only compilers for which runtime libraries need not be installed
either syste wide or next to every DLL that uses them (e.g., older
Microsoft compilers, or GCC).
- Turn the Three Layer Office back into a Two Layer Office, where the
URE and Basis layers are united (and the above scenario would again only
use one instance of msvcr90.dll loaded into the process, and everything
would probably work fine; there is also an instance of msvcr90.dll in
the Brand layer, but that should not interfere with any
cppu::getCaughtException calls).
Have your pick, folks. (Or, have a beer; its Friday after all...)
-Stephan
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