Due to a bug, -Wno-everything works like -Weverything. Fix the bug by having

-Wno-everything remap all warnings to ignored.

We can now use "-Wno-everything -W<warning>" to ignore all warnings except
specific ones.

llvm-svn: 149121

1 files changed, 8 insertions, 2 deletions

diff --git a/clang/lib/Frontend/Warnings.cpp b/clang/lib/Frontend/Warnings.cpp
index 576dd3d4459..f68e03b0d51 100644
--- a/clang/lib/Frontend/Warnings.cpp
+++ b/clang/lib/Frontend/Warnings.cpp
@@ -110,8 +110,14 @@ void clang::ProcessWarningOptions(DiagnosticsEngine &Diags,
       // -Weverything is a special case as well.  It implicitly enables all
       // warnings, including ones not explicitly in a warning group.
       if (Opt == "everything") {
-        if (SetDiagnostic)
-          Diags.setEnableAllWarnings(true);
+        if (SetDiagnostic) {
+          if (isPositive) {
+            Diags.setEnableAllWarnings(true);
+          } else {
+            Diags.setEnableAllWarnings(false);
+            Diags.setMappingToAllDiagnostics(diag::MAP_IGNORE);
+          }
+        }
         continue;
       }