Unable to build swift

Development Compiler
3

I've seen this error when building on Arch linux. I just disable it with this patch, never looked into why it happens:

diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index c748bd36eba..eef2c349848 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -10,7 +10,6 @@ SET(SWIFT_SPHINX_PAPER_SIZE "letter"
   CACHE STRING "Paper size for generated documentation")

 SET(SPHINX_ARGS
-  -W
   -D latex_elements.papersize=${SWIFT_SPHINX_PAPER_SIZE}
   -d ${CMAKE_BINARY_DIR}/doctrees)
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