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| -rw-r--r-- | site/user/build.md | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/site/user/build.md b/site/user/build.md index eaf0f68b1c..31216fd24c 100644 --- a/site/user/build.md +++ b/site/user/build.md @@ -265,6 +265,19 @@ There is also a corresponding 2015 toolchain, downloaded via `infra/bots/assets/ The Skia build assumes that the PATHEXT environment variable contains ".EXE". +### **Highly Recommended**: Build with clang-cl + +Skia uses generated code that is only optimized when Skia is built with clang. Other compilers get generic +unoptimized code. + +Setting the `cc` and `cxx` gn args is _not_ sufficient to build with clang-cl. These variables +are ignored on Windows. Instead set the variable `clang_win` to your LLVM installation directory. +If you installed the prebuilt LLVM downloaded from [here](https://releases.llvm.org/download.html "LLVM Download") in the default location that would be: + + clang_win = "C:\Program Files\LLVM" + +Follow the standard Windows path specification and not MinGW convention (e.g. `C:\Program Files\LLVM` not ~~`/c/Program Files/LLVM`~~). + ### Visual Studio Solutions If you use Visual Studio, you may want to pass `--ide=vs` to `bin/gn gen` to |