--- a/b2g/app/nsBrowserApp.cpp
+++ b/b2g/app/nsBrowserApp.cpp
@@ -218,16 +218,18 @@ int main(int argc, _CONST char* argv[])
 
   int gotCounters;
 #if defined(XP_UNIX)
   struct rusage initialRUsage;
   gotCounters = !getrusage(RUSAGE_SELF, &initialRUsage);
 #elif defined(XP_WIN)
   IO_COUNTERS ioCounters;
   gotCounters = GetProcessIoCounters(GetCurrentProcess(), &ioCounters);
+#else
+  #error "Unknown platform"  // having this here keeps cppcheck happy
 #endif
 
 #ifdef HAS_DLL_BLOCKLIST
   DllBlocklist_Initialize();
 #endif
 
   // B2G loader has already initialized Gecko so we can't initialize
   // it again here.
@@ -266,16 +268,18 @@ int main(int argc, _CONST char* argv[])
 #elif defined(XP_UNIX)
     XRE_TelemetryAccumulate(mozilla::Telemetry::EARLY_GLUESTARTUP_HARD_FAULTS,
                             int(initialRUsage.ru_majflt));
     struct rusage newRUsage;
     if (!getrusage(RUSAGE_SELF, &newRUsage)) {
       XRE_TelemetryAccumulate(mozilla::Telemetry::GLUESTARTUP_HARD_FAULTS,
                               int(newRUsage.ru_majflt - initialRUsage.ru_majflt));
     }
+#else
+  #error "Unknown platform"  // having this here keeps cppcheck happy
 #endif
   }
 
   int result;
   {
     ScopedLogging log;
     char **_argv;
 

--- a/browser/app/nsBrowserApp.cpp
+++ b/browser/app/nsBrowserApp.cpp
@@ -608,16 +608,18 @@ int main(int argc, char* argv[])
 
   int gotCounters;
 #if defined(XP_UNIX)
   struct rusage initialRUsage;
   gotCounters = !getrusage(RUSAGE_SELF, &initialRUsage);
 #elif defined(XP_WIN)
   IO_COUNTERS ioCounters;
   gotCounters = GetProcessIoCounters(GetCurrentProcess(), &ioCounters);
+#else
+  #error "Unknown platform"  // having this here keeps cppcheck happy
 #endif
 
   nsIFile *xreDirectory;
 
 #ifdef HAS_DLL_BLOCKLIST
   DllBlocklist_Initialize();
 
 #ifdef DEBUG
@@ -652,16 +654,18 @@ int main(int argc, char* argv[])
 #elif defined(XP_UNIX)
     XRE_TelemetryAccumulate(mozilla::Telemetry::EARLY_GLUESTARTUP_HARD_FAULTS,
                             int(initialRUsage.ru_majflt));
     struct rusage newRUsage;
     if (!getrusage(RUSAGE_SELF, &newRUsage)) {
       XRE_TelemetryAccumulate(mozilla::Telemetry::GLUESTARTUP_HARD_FAULTS,
                               int(newRUsage.ru_majflt - initialRUsage.ru_majflt));
     }
+#else
+  #error "Unknown platform"  // having this here keeps cppcheck happy
 #endif
   }
 
   int result = do_main(argc, argv, xreDirectory);
 
   NS_LogTerm();
 
 #ifdef XP_MACOSX