Hello,
With recent MSVC versions, we’re obliged to use /FORCE_:MULTIPLE, to work
around the fact that osgDB.lib includes symbols from std::fstream classes,
which then causes conflicts when other object files in a target (eg executable)
being linked use <fstream> classes. This slows down linking since incremental
linking is disabled, and makes our build output very noisy.
After some discussion, I came up with the following fix:
https://github.com/zakalawe/osg/commit/2098c022283f1afeb4bad0ffb4b682b884cc8f32
The idea is to only export the non-inlined symbols from osgDB::ofstream and
::ifstream, but not to export the entire class, since doing so forces MSVC to
also export the constructor and destructor for the base class (std::ofstream
and std::ifstream).
Since we don’t use the osgDB versions of fstream in FlightGear, I can’t check
if this is backwards compatible for other Windows OSG users, but I am hopeful
that it is, and hence that this approach could be upstreamed.
Kind regards,
James
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