[clang-cl] Alias /Wall to -Weverything

cl interprets this option to mean enable every supported warning, which
is what Clang's -Weverything flag does.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@319116 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Driver/CLCompatOptions.td

@@ -145,7 +145,8 @@ def _SLASH_W1 : CLFlag<"W1">, HelpText<"Enable -Wall">, Alias<Wall>;
 def _SLASH_W2 : CLFlag<"W2">, HelpText<"Enable -Wall">, Alias<Wall>;
 def _SLASH_W3 : CLFlag<"W3">, HelpText<"Enable -Wall">, Alias<Wall>;
 def _SLASH_W4 : CLFlag<"W4">, HelpText<"Enable -Wall and -Wextra">, Alias<WCL4>;
-def _SLASH_Wall : CLFlag<"Wall">, HelpText<"Enable -Wall and -Wextra">, Alias<WCL4>;
+def _SLASH_Wall : CLFlag<"Wall">, HelpText<"Enable -Weverything">,
+  Alias<W_Joined>, AliasArgs<["everything"]>;
 def _SLASH_WX : CLFlag<"WX">, HelpText<"Treat warnings as errors">,
   Alias<W_Joined>, AliasArgs<["error"]>;
 def _SLASH_WX_ : CLFlag<"WX-">, HelpText<"Do not treat warnings as errors">,

test/Driver/cl-options.c

@@ -255,9 +255,10 @@
 // RUN: %clang_cl /W2 -### -- %s 2>&1 | FileCheck -check-prefix=W1 %s
 // RUN: %clang_cl /W3 -### -- %s 2>&1 | FileCheck -check-prefix=W1 %s
 // RUN: %clang_cl /W4 -### -- %s 2>&1 | FileCheck -check-prefix=W4 %s
-// RUN: %clang_cl /Wall -### -- %s 2>&1 | FileCheck -check-prefix=W4 %s
+// RUN: %clang_cl /Wall -### -- %s 2>&1 | FileCheck -check-prefix=Weverything %s
 // W1: -Wall
 // W4: -WCL4
+// Weverything: -Weverything
 
 // RUN: %clang_cl /WX -### -- %s 2>&1 | FileCheck -check-prefix=WX %s
 // WX: -Werror