Help make Base compile under NaCl...

base/time_posix.cc

Index: base/time_posix.cc
===================================================================
--- base/time_posix.cc	(revision 67731)
+++ base/time_posix.cc	(working copy)
@@ -60,6 +60,26 @@
   return Now();
 }
 
+#if defined(OS_NACL)
+#include <stdlib.h>
+// NaCl doesn't have timegm, so we use this hack for now.
+// http://code.google.com/p/nativeclient/issues/detail?id=1160

[brettw, 2010/12/01 22:59:56]

I'd like to at least see a comment here about why this works. Like along the
lines of "since we want GMT, we reset the time zone informations stored in the
environment, get the time, and then put it back. TODO(abarth) this will not work
across threads, blah blah blah."

+static time_t my_timegm (struct tm *tm) {
+  time_t ret;
+  char *tz;
+  tz = getenv("TZ");
+  setenv("TZ", "", 1);
+  tzset();
+  ret = mktime(tm);
+  if (tz)
+    setenv("TZ", tz, 1);
+  else
+    unsetenv("TZ");
+  tzset();
+  return ret;
+}
+#endif
+
 // static
 Time Time::FromExploded(bool is_local, const Exploded& exploded) {
   struct tm timestruct;
@@ -72,14 +92,20 @@
   timestruct.tm_wday   = exploded.day_of_week;  // mktime/timegm ignore this
   timestruct.tm_yday   = 0;     // mktime/timegm ignore this
   timestruct.tm_isdst  = -1;    // attempt to figure it out
+#if !defined(OS_NACL)
   timestruct.tm_gmtoff = 0;     // not a POSIX field, so mktime/timegm ignore
   timestruct.tm_zone   = NULL;  // not a POSIX field, so mktime/timegm ignore
+#endif
 
   time_t seconds;
   if (is_local)
     seconds = mktime(&timestruct);
   else
+#if defined(OS_NACL)
+    seconds = my_timegm(&timestruct);
+#else
     seconds = timegm(&timestruct);
+#endif
 
   int64 milliseconds;
   // Handle overflow.  Clamping the range to what mktime and timegm might
@@ -166,6 +192,14 @@
   return TimeTicks(absolute_micro);
 }
 
+#elif defined(OS_NACL)
+TimeTicks TimeTicks::Now() {
+  // NaCl sadly does not have _POSIX_TIMERS enabled in sys/features.h
+  // Apparently NaCl only has CLOCK_REALTIME:
+  // http://code.google.com/p/nativeclient/issues/detail?id=1159
+  return TimeTicks(clock());
+}
+
 #else  // _POSIX_MONOTONIC_CLOCK
 #error No usable tick clock function on this platform.
 #endif  // _POSIX_MONOTONIC_CLOCK