move unix_epoch to time_zone.h to avoid jumbo/unity build failure

Signed-off-by: Steven Noonan <[email protected]>

Author: tycho

absl/time/format.cc

@@ -44,11 +44,6 @@ struct cctz_parts {
   cctz::detail::femtoseconds fem;
 };
 
-inline cctz::time_point<cctz::seconds> unix_epoch() {
-  return std::chrono::time_point_cast<cctz::seconds>(
-      std::chrono::system_clock::from_time_t(0));
-}
-
 // Splits a Time into seconds and femtoseconds, which can be used with CCTZ.
 // Requires that 't' is finite. See duration.cc for details about rep_hi and
 // rep_lo.

absl/time/internal/cctz/include/cctz/time_zone.h

@@ -454,6 +454,14 @@ inline bool join_seconds(const time_point<seconds>& sec, const femtoseconds&,
 }  // namespace detail
 }  // namespace cctz
 }  // namespace time_internal
+
+namespace {
+inline absl::time_internal::cctz::time_point<absl::time_internal::cctz::seconds> unix_epoch() {
+  return std::chrono::time_point_cast<absl::time_internal::cctz::seconds>(
+      std::chrono::system_clock::from_time_t(0));
+}
+} // namespace
+
 ABSL_NAMESPACE_END
 }  // namespace absl
 

absl/time/time.cc

@@ -51,11 +51,6 @@ ABSL_NAMESPACE_BEGIN
 
 namespace {
 
-inline cctz::time_point<cctz::seconds> unix_epoch() {
-  return std::chrono::time_point_cast<cctz::seconds>(
-      std::chrono::system_clock::from_time_t(0));
-}
-
 // Floors d to the next unit boundary closer to negative infinity.
 inline int64_t FloorToUnit(absl::Duration d, absl::Duration unit) {
   absl::Duration rem;