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AddDeleteInputFile #4768

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1 change: 1 addition & 0 deletions docs/msbuild/incremental-builds.md
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Expand Up @@ -14,6 +14,7 @@ ms.workload:
# Incremental builds

Incremental builds are builds that are optimized so that targets that have output files that are up-to-date with respect to their corresponding input files are not executed. A target element can have both an `Inputs` attribute, which indicates what items the target expects as input, and an `Outputs` attribute, which indicates what items it produces as output. MSBuild attempts to find a 1-to-1 mapping between the values of these attributes. If a 1-to-1 mapping exists, MSBuild compares the time stamp of every input item to the time stamp of its corresponding output item. Output files that have no 1-to-1 mapping are compared to all input files. An item is considered up-to-date if its output file is the same age or newer than its input file or files.
Output file might not detect changes if input files are added or deleted.

If all output items are up-to-date, MSBuild skips the target. This *incremental build* of the target can significantly improve the build speed. If only some files are up-to-date, MSBuild executes the target but skips the up-to-date items, and thereby brings all items up-to-date. This process is known as a *partial incremental build*.

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