Install ninja on Windows dev machines

- as recommended by @kevinushey, dramatically improves speed of incremental builds
rstudio · Jun 14, 2018 · 0e6ff53 · 0e6ff53
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diff --git a/dependencies/windows/Install-RStudio-Prereqs.ps1 b/dependencies/windows/Install-RStudio-Prereqs.ps1
@@ -154,7 +154,7 @@ refreshenv
 # install some deps via chocolatey
 choco install -y cmake --installargs 'ADD_CMAKE_TO_PATH=""System""' --fail-on-error-output
 refreshenv
-choco install -y jdk8 ant windows-sdk-10.1 vcbuildtools 7zip git
+choco install -y jdk8 ant windows-sdk-10.1 vcbuildtools 7zip git ninja
 
 # fixups for Windows SDK
 mv "C:\Program Files (x86)\Windows Kits\10\bin\x86" "C:\Program Files (x86)\Windows Kits\10\bin\x86_orig"

diff --git a/dependencies/windows/README.md b/dependencies/windows/README.md
@@ -34,6 +34,8 @@ Build C++
 - Open Qt Creator
 - Open Project and select rstudio\src\cpp\CMakelists.txt
 - Select the 64-bit kit (RStudio for Windows is 64-bit only)
+- (Optional but recommended): Change the `CMake generator` for the kit to 
+`Ninja` for faster incremental builds
 - Click Configure, then build
 
 Run RStudio