-(Optional) This option is deprecated starting in Visual Studio 2015. Instead, use **`/LTCG`** and `[/GENPROFILE` or `/FASTGENPROFILE`](genprofile-fastgenprofile-generate-profiling-instrumented-build.md) to generate an instrumented build for profile-guided optimization. The data that is collected from instrumented runs is used to create an optimized image. For more information, see [Profile-Guided Optimizations](../profile-guided-optimizations.md). The short form of this option is **`/LTCG:PGI`**.
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