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Deterministic Builds in C#

Deterministic Builds in C#


The C# compiler (Roslyn) supports deterministic builds since Visual Studio 2015. This means that compiling assemblies under the same conditions (permalink) would produce byte-for-byte equivalent binaries.

If you also intend on shipping non-portable (permalink)) PDBs, you must also make sure that paths in the PDBs are absolute using path mapping. The recommended way would be to map the enlistment (repo) root to a fixed path, such as C:\.

For more information, see this blog post.

How To

  • Deterministic requires Visual Studio 2015 (Roslyn version 1.0).
  • PathMap requires Visual Studio 2015 Update 3 (Roslyn version 1.3).

In MSBuild (.csproj) - assuming you've defined the property EnlistmentRoot somewhere:


In the compiler command-line:

> csc /deterministic /pathmap:C:\Source\MyRepo=C:\

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@samhocevar samhocevar commented Dec 8, 2019

A minor note: that </Features> closing tag should be </PathMap>.

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