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authorPhil Christensen <philc@microsoft.com>2019-02-28 14:36:23 -0800
committerPhil Christensen <philc@microsoft.com>2019-02-28 14:36:23 -0800
commit773c8267dfb506f41c204f61042f30b6143a8095 (patch)
tree5946d1526c3ad77a2df80786a1370d96389d931b /docs/users/triplets.md
parent6afbceb27fd2aa39c66f810a22f5d4ad97575110 (diff)
parent7859944528be28bee1fda9f325b78d6a7f02124e (diff)
downloadvcpkg-773c8267dfb506f41c204f61042f30b6143a8095.tar.gz
vcpkg-773c8267dfb506f41c204f61042f30b6143a8095.zip
Merge branch 'master' of https://github.com/microsoft/vcpkg into dev/philc/4564
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diff --git a/docs/users/triplets.md b/docs/users/triplets.md
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@@ -33,24 +33,6 @@ Valid options include any CMake system name, such as:
- `Darwin` (Mac OSX)
- `Linux` (Linux)
-### VCPKG_PLATFORM_TOOLSET
-Specifies the VS-based C/C++ compiler toolchain to use.
-
-This can be set to `v141`, `v140`, or left blank. If left blank, we select the latest compiler toolset available on your machine.
-
-Visual Studio 2015 platform toolset is `v140`
-Visual Studio 2017 platform toolset is `v141`
-
-### VCPKG_VISUAL_STUDIO_PATH
-Specifies the Visual Studio installation to use.
-
-When unspecified, a Visual Studio instance is selected automatically, preferring Stable 2017, then Preview 2017, then 2015.
-
-The path should be absolute, formatted with backslashes, and have no trailing slash:
-```cmake
-set(VCPKG_VISUAL_STUDIO_PATH "C:\\Program Files (x86)\\Microsoft Visual Studio\\Preview\\Community")
-```
-
### VCPKG_CHAINLOAD_TOOLCHAIN_FILE
Specifies an alternate CMake Toolchain file to use.
@@ -69,7 +51,36 @@ This option also has forms for configuration-specific and C flags:
- `VCPKG_C_FLAGS_DEBUG`
- `VCPKG_C_FLAGS_RELEASE`
-## macOS Variables
+## Windows Variables
+
+<a name="VCPKG_VISUAL_STUDIO_PATH"></a>
+### VCPKG_VISUAL_STUDIO_PATH
+Specifies the Visual Studio installation to use.
+
+To select the precise combination of Visual Studio instance and toolset version, we walk through the following algorithm:
+1. Determine the setting for `VCPKG_VISUAL_STUDIO_PATH` from the triplet, or the environment variable `VCPKG_VISUAL_STUDIO_PATH`, or consider it unset
+2. Determine the setting for `VCPKG_PLATFORM_TOOLSET` from the triplet or consider it unset
+3. Gather a list of all pairs of Visual Studio Instances with all toolsets available in those instances
+ 1. This is ordered first by instance type (Stable, Prerelease, Legacy) and then by toolset version (v142, v141, v140)
+4. Filter the list based on the settings for `VCPKG_VISUAL_STUDIO_PATH` and `VCPKG_PLATFORM_TOOLSET`.
+5. Select the best remaining option
+
+The path should be absolute, formatted with backslashes, and have no trailing slash:
+```cmake
+set(VCPKG_VISUAL_STUDIO_PATH "C:\\Program Files (x86)\\Microsoft Visual Studio\\Preview\\Community")
+```
+
+### VCPKG_PLATFORM_TOOLSET
+Specifies the VS-based C/C++ compiler toolchain to use.
+
+See [`VCPKG_VISUAL_STUDIO_PATH`](#VCPKG_VISUAL_STUDIO_PATH) for the full selection algorithm.
+
+Valid settings:
+* The Visual Studio 2019 platform toolset is `v142`.
+* The Visual Studio 2017 platform toolset is `v141`.
+* The Visual Studio 2015 platform toolset is `v140`.
+
+## MacOS Variables
### VCPKG_INSTALL_NAME_DIR
Sets the install name used when building macOS dynamic libraries. Default value is `@rpath`. See the CMake documentation for [CMAKE_INSTALL_NAME_DIR](https://cmake.org/cmake/help/latest/variable/CMAKE_INSTALL_NAME_DIR.html) for more information.