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Merge pull request #3939 from corob-msft/docs/corob/clr-advanced-change
Update Advanced prop page and C1107
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‎docs/build/reference/advanced-property-page.md‎

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---
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description: "Use the Advanced property page in Visual Studio 2019 to set various properties for C++ projects."
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title: "Advanced Property Page (Project)"
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ms.date: 05/28/2021
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f1_keywords: ["VC.Project.VCConfiguration.TargetExt", "VC.Project.VCConfiguration.DeleteExtensionsOnClean", "VC.Project.VCConfiguration.BuildLogFile", "VC.Project.VCConfiguration.PreferredToolArchitecture", "VC.Project.VCConfiguration.UseDebugLibraries", "VC.Project.VCConfiguration.EnableUnitySupport", "VC.Project.VCConfiguration.CopyLocalDeploymentContent", "VC.Project.VCConfiguration.CopyLocalProjectReference", "VC.Project.VCConfiguration.CopyLocalDebugSymbols", "VC.Project.VCConfiguration.CopyCppRuntimeToOutputDir", "VC.Project.VCConfiguration.useOfMfc", "VC.Project.VCConfiguration.CharacterSet", "VC.Project.VCConfiguration.WholeProgramOptimization", "VC.Project.VCConfiguration.VCToolsVersion", "VC.Project.VCConfiguration.LLVMToolsVersion", "VC.Project.VCConfiguration.ManagedExtensions", "VC.Project.TargetFrameworkVersion", "VC.Project.VCConfiguration.EnableManagedIncrementalBuild"]
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ms.date: 11/22/2021
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f1_keywords: ["VC.Project.VCConfiguration.TargetExt", "VC.Project.VCConfiguration.DeleteExtensionsOnClean", "VC.Project.VCConfiguration.BuildLogFile", "VC.Project.VCConfiguration.PreferredToolArchitecture", "VC.Project.VCConfiguration.UseDebugLibraries", "VC.Project.VCConfiguration.EnableUnitySupport", "VC.Project.VCConfiguration.CopyLocalDeploymentContent", "VC.Project.VCConfiguration.CopyLocalProjectReference", "VC.Project.VCConfiguration.CopyLocalDebugSymbols", "VC.Project.VCConfiguration.CopyCppRuntimeToOutputDir", "VC.Project.VCConfiguration.useOfMfc", "VC.Project.VCConfiguration.CharacterSet", "VC.Project.VCConfiguration.WholeProgramOptimization", "VC.Project.VCConfiguration.VCToolsVersion", "VC.Project.VCConfiguration.LLVMToolsVersion", "VC.Project.VCConfiguration.ManagedExtensions", "VC.Project.TargetFrameworkVersion", "VC.Project.VCConfiguration.EnableManagedIncrementalBuild", "VC.Project.VCConfiguration.ManagedAssembly"]
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# Advanced Property Page
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For managed projects, this option enables detection of external visibility when you generate assemblies. If a change to a managed project isn't visible to other projects, dependent projects aren't rebuilt. Managed incremental builds can dramatically improve build times in solutions that include managed projects.
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### Enable CLR Support for Individual Files
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This option sets a `ManagedAssembly` build property that enables building only some files in the project as managed code. You must set **Enable CLR Support for Individual Files** to **Yes** if some but not all of your project files are built as managed code. This property is only available in projects that use the v143 or later toolset in Visual Studio 2022 and later versions.
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::: moniker-end

‎docs/error-messages/compiler-errors-1/fatal-error-c1107.md‎

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description: "Learn more about: Fatal Error C1107"
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title: "Fatal Error C1107"
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ms.date: "11/04/2016"
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ms.date: 11/22/2021
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f1_keywords: ["C1107"]
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helpviewer_keywords: ["C1107"]
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ms.assetid: 541a4d9f-10bc-4dd8-b68e-15e548f3dc0a
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---
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# Fatal Error C1107
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could not find assembly 'file': please specify the assembly search path using /AI or by setting the LIBPATH environment variable
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> could not find assembly '*file*': please specify the assembly search path using `/AI` or by setting the `LIBPATH` environment variable
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A metadata file was passed to a [#using](../../preprocessor/hash-using-directive-cpp.md) directive that the compiler was unable to locate.
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A metadata file was passed to a [`#using`](../../preprocessor/hash-using-directive-cpp.md) directive that the compiler was unable to locate.
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LIBPATH, which is described in the topic for `#using`, and the [/AI](../../build/reference/ai-specify-metadata-directories.md) compiler option allow you to specify directories in which the compiler will look for referenced metadata files.
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LIBPATH, which is described in the article for `#using`, and the [`/AI`](../../build/reference/ai-specify-metadata-directories.md) compiler option allow you to specify directories in which the compiler will look for referenced metadata files.
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This error can occur when you retarget a project to use the Visual Studio 2022 toolset. Projects created by older versions of the toolset set properties `TargetRuntime=Managed` and `TargetFrameworkVersion=4.0` by default. Starting in Visual Studio 2022, .NET Framework 4.0 isn't installed, and projects default to `TargetRuntime=Native`.
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If you retarget a project that used [`/clr`](../../build/reference/clr-common-language-runtime-compilation.md) for some or all of its source files, starting in Visual Studio 2022 you must set certain properties to build your project. If all the source files in your project are compiled as managed code, use the **`/clr`** compiler option for your project. If only some files in your project use **`/clr`**, set the `ManagedAssembly=true` property in your project properties.
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To set these properties in the IDE, open the Property Pages dialog for your project. Select the **Configuration Properties** > **Advanced** page.
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- To set **`/clr`** for the entire project, change the **Common Language Runtime Support** property. You may also need to set the **.NET Target Framework Version** property. Choose **Okay** or **Apply** to save your changes.
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- If you only use **`/clr`** for some of the files in your project, set the **Enable CLR Support for individual files** property to **Yes**. This value sets the `ManagedAssembly=true` property in your project properties. Choose **Okay** or **Apply** to save your changes.
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For more information about the options on the **Advanced** property page, see [Advanced Property Page](../../build/reference/advanced-property-page.md).

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