[odb-users] ODB exception problem
cetoni GmbH - Uwe Kindler
uwe.kindler at cetoni.de
Fri Jun 10 07:20:10 EDT 2011
thank you for the response.
We use the MinGW build with GCC 4.5.1 from here (now there is already
the version 4.5.2 available but we still use 4.5.1):
Like I mentioned it in my last mail we use this MinGW version since over
a year now without any trouble. Our projects are plugin based and use
DLLs extensively and we never had any problems throwing and catching
exceptions across DLL boundaries so this is quite strange.
This is what the compilers readme file says about exceptions and DLLs:
*** Exceptions and DLLs ***
With the advent of the GCC 4.5 release series, the mingw32 port finally
fully the same method every other platform uses to allow exceptions to
out of shared libraries (DLLs): gcc library DLLs. For any GCC language that
supports exceptions (and DLLs), this method requires the runtime
presence of two
additional DLLs: (1) libgcc_s*.dll, which contains common core data, and
However, TDM-GCC also continues to integrate a versioned shared memory
for the *static* (non-DLL) runtime libraries, which will still allow you to
throw exceptions between any DLLs or executables that are built with
This method incurs a very small execution overhead as compared to the shared
library method, but has the very important benefit of not requiring you to
redistribute extra DLLs with your program.
By default, TDM-GCC will continue to create executables and DLLs that
static libraries and do not require you to redistribute further DLLs. If you
would like to use the shared libraries, you should add "-shared-libgcc"
command line to use a shared version of libgcc, and additionally ensure
shared version of your language-specific runtime library is being used.
You cannot use a shared version of libgcc with a static version of a
specific runtime. The reverse -- static libgcc with shared language-specific
runtime -- should work fine.
From reading this documentation it should be possible to throw
exceptions even if we do not use shared versions of libgcc and
libstdc++. I modified the ODB example under
odb-examples-1.4.0/schema/custom to throw an exception and it shows the
same behaviour - the exception is not caught. Now I'm going to try to
use the shared versions and will tell you about the results.
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