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I have a library i need to use in release mode since it’s performance is reduced significantly without optimizations.
When i use it with /MD in my /MDd it gives crt warning, which i figure it is bad. (may cause heap corruption?)
so what i did is, keep all the release optimizations but link library with /MDd.
warning disappeared.
however, could this cause any problems or performance loss?
It can cause performance loss to use /MDd instead of /MD, but this definitively depends on what you do. If you don’t use the runtime in your performance-critical code anyway, you will not see any slow down.
Alternatively you could solve your problem the other way around: Build application and library with /MD, but the application still with debug information and without optimization.