Build: Default to treating warnings as errors

Bug: b/130335507
Change-Id: I4cd5ab717bab39f1b03a4c6e8140603aa36c2fff
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28869
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a922c4a..440d5a1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,7 @@
 option (ASAN "Build with address sanitizer" 0)
 option (TSAN "Build with thread sanitizer" 0)
 option (UBSAN "Build with undefined behavior sanitizer" 0)
-option (WARNINGS_AS_ERRORS "Treat all warnings as errors" 0)
+option (WARNINGS_AS_ERRORS "Treat all warnings as errors" 1)
 option (DCHECK_ALWAYS_ON "Check validation macros even in release builds" 0)
 
 if(ARCH STREQUAL "arm")