Fix building with profilingsupport=off

src/log.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1860 matching lines @@
 
   return true;
 
 #else
   return false;
 #endif
 }
 
 
 Sampler* Logger::sampler() {
+#ifdef ENABLE_LOGGING_AND_PROFILING
   return ticker_;
+#else
+  return NULL;
+#endif
 }
 
 
 void Logger::EnsureTickerStarted() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   ASSERT(ticker_ != NULL);
   if (!ticker_->IsActive()) ticker_->Start();
 #endif
 }
 
@@ skipping 56 matching lines @@
   for (int i = 0;
        ActiveSamplersExist() && i < active_samplers_->length();
        ++i) {
     func(active_samplers_->at(i), param);
   }
   return ActiveSamplersExist();
 }
 
 
 static void ComputeCpuProfiling(Sampler* sampler, void* flag_ptr) {
+#ifdef ENABLE_LOGGING_AND_PROFILING
   bool* flag = reinterpret_cast<bool*>(flag_ptr);
   *flag |= sampler->IsProfiling();
+#endif
 }
 
 
 SamplerRegistry::State SamplerRegistry::GetState() {
   bool flag = false;
   if (!IterateActiveSamplers(&ComputeCpuProfiling, &flag)) {
     return HAS_NO_SAMPLERS;
   }
   return flag ? HAS_CPU_PROFILING_SAMPLERS : HAS_SAMPLERS;
 }
@@ skipping 14 matching lines @@
 void SamplerRegistry::RemoveActiveSampler(Sampler* sampler) {
   ASSERT(sampler->IsActive());
   ScopedLock lock(mutex_);
   ASSERT(active_samplers_ != NULL);
   bool removed = active_samplers_->RemoveElement(sampler);
   ASSERT(removed);
   USE(removed);
 }
 
 } }  // namespace v8::internal