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VS2003 compatibility with disabled debug information
If debug information is disabled, the program database file name will be initialized to $(IntDir)vc$(PlatformToolsetVersion).pdb anyway.
This causes the always complete rebuild, because the mentioned file (in this case vc71.pdb) is not available.
I've to set program database file name to "" to get correct result.
I tried to fix this in Daffodil code, but I failed with this job :(