what is .obj and .ipdb file in Visual Studio 2017? .iobj is generated in release mode.
- Possible to stop generating *.ipdb *.iobj files by VIsual Studio 2015?
- What is the difference between .ilk and .iobj files?
These files are produced when Incremental Link-Time Code Generation (LTCG) is enabled. This is a new feature in Visual C++ 2015.
If you disable Incremental LTCG, the linker will stop producing these files. But then you lose the benefits of Incremental LTCG.
To disable Incremental LTCG, modify your project properties: Configuration Properties-> Linker => Optimization-> change "Link Time Code Generation" to something other than "Use Fast Link Time Code Generation (/LTCG:incremental)" (this is the default for Release builds).
One optimisation that LTCG can perform is inline a function from another compilation unit (i.e. source file). The compiler (of course) can't do this. There are no doubt others.
.ilk files, on the other hand, support incremental linking for debug builds, to get fast link times. This is not the same as incremental LTCG, where the linker tries to make use of cross-compilation-unit optimisations that it has done before, again to speed things up, but in a different way.
It follows that to suppress generation of .iobj files, turn off 'incremental link time code generation' for your project, and to suppress generation of .ilk files, turn off 'incremental linking'. I believe that both of these are linker options. But why bother? - they speed up development. Instead, I delete these files when I archive [a version of] my project.
Incremental linking is normally turned off for release builds, although I'm not sure why. Perhaps the two options are mutually incompatible, I've never tried enabling them both at once. Or maybe MS figured that we were fed up with them cluttering up our hard disks with build products, who knows?
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