Prepare dual-mode compiler plugin feature

...which can act as either a rewriter or a non-rewriter that emits warnings.

Also added COMPILER_PLUGIN_WARNINGS_ONLY=X to demote warnings from plugin X from
errors to warnings, even under --enable-werror.

Change-Id: I05361936240a890515c6bba2459565417c1746b7

1 files changed, 1 insertions, 1 deletions

diff --git a/compilerplugins/clang/unusedvariablecheck.hxx b/compilerplugins/clang/unusedvariablecheck.hxx
index cf0ca7dc4c12..b3e8467a709e 100644
--- a/compilerplugins/clang/unusedvariablecheck.hxx
+++ b/compilerplugins/clang/unusedvariablecheck.hxx
@@ -22,7 +22,7 @@ class UnusedVariableCheck
     , public Plugin
     {
     public:
-        explicit UnusedVariableCheck( CompilerInstance& compiler );
+        explicit UnusedVariableCheck( const InstantiationData& data );
         virtual void run() override;
         bool VisitVarDecl( const VarDecl* var );
     };