David Cole writes: > Not only is it possible ... it WILL happen if you use the Microsoft > C++ compiler and try to mix and match Release and Debug compilation > units. > > The MS compiler has some very nice memory tracking facilities built > into the Debug runtime libraries, but it is accomplished via different > structs for Debug and Release builds with extra stuff in the Debug > structs.
> So allocations from a Debug compilation unit will not be accessed > correctly in a linked-in Release compilation unit when a pointer to it > is passed across the boundary. > > You will see access violations and hard crashes happening in builds > from the Microsoft compiler unless you ensure that everything in a > build has matching Debug/Release defines and compiler settings. > > It is only safe to mix-n-match if all calls which cross a boundary > between compilation units have NO differences in their struct and > class definitions from an ABI perspective. Since it is difficult to > verify when this is the case (in general) for large C++ projects, it's > best to avoid mixing and matching... I'm *not* mixing stuff built with `-g` and stuff built without it. I'm also *not* mixing linking with debug- and non-debug libraries. I'm only mixing stuff build with `-DNDEBUG` and stuff built without it. /M -- Magnus Therning OpenPGP: 0x927912051716CE39 email: mag...@therning.org jabber: mag...@therning.org twitter: magthe http://therning.org/magnus Software isn't finished until the last user is dead. -- head on FLOSS Weekly
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