disable warn_impcast_unicode_char_type until gtest fixed for rocSOLVER build

Author: ronlieb

clang/lib/Sema/SemaChecking.cpp

@@ -11906,9 +11906,11 @@ static void DiagnoseMixedUnicodeImplicitConversion(Sema &S, const Type *Source,
   } else {
     bool LosesPrecision = S.getASTContext().getIntWidth(E->getType()) >
                           S.getASTContext().getIntWidth(T);
+#ifdef FIXME_GTEST_ROCSOLVER
     DiagnoseImpCast(S, E, T, CC,
                     LosesPrecision ? diag::warn_impcast_unicode_precision
                                    : diag::warn_impcast_unicode_char_type);
+#endif
   }
 }
 

clang/test/SemaCXX/warn-implicit-unicode-conversions.cpp

@@ -1,5 +1,5 @@
 // RUN: %clang_cc1 -verify -fsyntax-only -std=c++20 -Wconversion %s
-
+// XFAIL: *
 void c8(char8_t);
 void c16(char16_t);
 void c32(char32_t);