gecko-dev/gfx/ycbcr/clang-cl-workaround.patch

diff --git a/gfx/ycbcr/yuv_row_win.cpp b/gfx/ycbcr/yuv_row_win.cpp
--- a/gfx/ycbcr/yuv_row_win.cpp
+++ b/gfx/ycbcr/yuv_row_win.cpp
@@ -6,16 +6,22 @@
 #include "mozilla/SSE.h"
 
 #define kCoefficientsRgbU kCoefficientsRgbY + 2048
 #define kCoefficientsRgbV kCoefficientsRgbY + 4096
 
 extern "C" {
 
 #if defined(MOZILLA_MAY_SUPPORT_SSE) && defined(_M_IX86)
+#if defined(__clang__)
+// clang-cl may erroneously discard the symbol `kCoefficientsRgbY`
+// https://bugs.llvm.org/show_bug.cgi?id=35290
+volatile auto keep_kCoefficientsRgbY_alive = &kCoefficientsRgbY;
+#endif
+
 __declspec(naked)
 void FastConvertYUVToRGB32Row_SSE(const uint8* y_buf,
                                   const uint8* u_buf,
                                   const uint8* v_buf,
                                   uint8* rgb_buf,
                                   int width) {
   __asm {
     pushad