4 files changed, 6 insertions, 2 deletions
diff --git a/dep.cc b/dep.cc
index 7416774..9657a8a 100644
--- a/dep.cc
+++ b/dep.cc
@@ -399,7 +399,7 @@ class DepBuilder {
     return rule.get();
   }
 
-  DepNode* BuildPlan(Symbol output, Symbol needed_by) {
+  DepNode* BuildPlan(Symbol output, Symbol needed_by UNUSED) {
     LOG("BuildPlan: %s for %s",
         output.c_str(),
         needed_by.c_str());
diff --git a/eval.cc b/eval.cc
index 69339e4..a93d307 100644
--- a/eval.cc
+++ b/eval.cc
@@ -199,6 +199,7 @@ void Evaluator::EvalIf(const IfAST* ast) {
     }
     default:
       CHECK(false);
+      abort();
   }
 
   const vector<AST*>* asts;
diff --git a/exec.cc b/exec.cc
index 056318e..c5b7b19 100644
--- a/exec.cc
+++ b/exec.cc
@@ -44,7 +44,7 @@ class Executor {
       : ce_(ev) {
   }
 
-  void ExecNode(DepNode* n, DepNode* needed_by) {
+  void ExecNode(DepNode* n, DepNode* needed_by UNUSED) {
     if (done_[n->output])
       return;
     done_[n->output] = true;
diff --git a/log.h b/log.h
index c230217..702af1b 100644
--- a/log.h
+++ b/log.h
@@ -28,6 +28,9 @@ using namespace std;
 extern bool g_log_no_exit;
 extern string* g_last_error;
 
+// Useful for logging-only arguments.
+#define UNUSED __attribute__((unused))
+
 #ifdef NOLOG
 #define LOG(args...)
 #else