Namespace clean-up for time64.

All of the time64 functions are only visible within pp_sys.c and are not
part of the public API, so make them all static and give them the S_ prefix.
A side effect of this is that we now unambiguously use S_localtime64_r and
S_gmtime64_r and should no longer collide with system-supplied versions, if
any.

One possible future direction is that if and when Configure detects any
system-supplied *time64_r functions, their prototypes, and their valid
time ranges, we could optionally select those instead of the home-grown
ones.

Another possible future direction is that we could s/S_/Perl_/ and make
the *time64_r functions part of the public API in some post-5.10.x
release.  Currently they are only exposed to the outside world via
Perl_pp_gmtime.

Also gave some TRACE macros more specific names.

1 files changed, 2 insertions, 2 deletions

diff --git a/pp_sys.c b/pp_sys.c
index b42cced0e2..46cb17eae4 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -4473,9 +4473,9 @@ PP(pp_gmtime)
     }
 
     if (PL_op->op_type == OP_LOCALTIME)
-        err = localtime64_r(&when, &tmbuf);
+        err = S_localtime64_r(&when, &tmbuf);
     else
-	err = gmtime64_r(&when, &tmbuf);
+	err = S_gmtime64_r(&when, &tmbuf);
 #endif
 
     if (err == NULL && ckWARN(WARN_OVERFLOW)) {