ARM: Log an error if /proc/cpuinfo cannot be opened

src/platform-linux.cc

 // Copyright 2012 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 93 matching lines @@
 #ifdef __arm__
 static bool CPUInfoContainsString(const char * search_string) {
   const char* file_name = "/proc/cpuinfo";
   // This is written as a straight shot one pass parser
   // and not using STL string and ifstream because,
   // on Linux, it's reading from a (non-mmap-able)
   // character special device.
   FILE* f = NULL;
   const char* what = search_string;
 
-  if (NULL == (f = fopen(file_name, "r")))
+  if (NULL == (f = fopen(file_name, "r"))) {
+    OS::PrintError("Failed to open /proc/cpuinfo\n");
     return false;
+  }
 
   int k;
   while (EOF != (k = fgetc(f))) {
     if (k == *what) {
       ++what;
       while ((*what != '\0') && (*what == fgetc(f))) {
         ++what;
       }
       if (*what == '\0') {
         fclose(f);
@@ skipping 1199 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SignalSender::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal