ICU 56 step 4: Apply post-56 fixes for measure/date format

patches/tzdetect.patch

+diff --git a/source/common/putil.cpp b/source/common/putil.cpp
+index 5f09288..c87b60e 100644
+--- a/source/common/putil.cpp
++++ b/source/common/putil.cpp
+@@ -970,6 +970,15 @@ static char* searchForTZFile(const char* path, DefaultTZInfo* tzInfo) {
+     return result;
+ }
+ #endif
++
++U_CAPI void U_EXPORT2
++uprv_tzname_clear_cache()
++{
++#if defined(CHECK_LOCALTIME_LINK) && !defined(DEBUG_SKIP_LOCALTIME_LINK)
++    gTimeZoneBufferPtr = NULL;
++#endif
++}
++
+ U_CAPI const char* U_EXPORT2
+ uprv_tzname(int n)
+ {
+diff --git a/source/common/putilimp.h b/source/common/putilimp.h
+index 5de801f..55ec0ae 100644
+--- a/source/common/putilimp.h
++++ b/source/common/putilimp.h
+@@ -479,6 +479,12 @@ U_INTERNAL int32_t  U_EXPORT2 uprv_timezone(void);
+ U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
+ 
+ /**
++ * Reset the global tzname cache.
++ * @internal
++ */
++U_INTERNAL void uprv_tzname_clear_cache();
++
++/**
+  * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
+  * This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
+  * @return the UTC time measured in milliseconds
 diff --git a/source/i18n/timezone.cpp b/source/i18n/timezone.cpp
-index 6ed008d..6b3f8d2 100644
+index 59c3891..00eca38 100644
 --- a/source/i18n/timezone.cpp
 +++ b/source/i18n/timezone.cpp
-@@ -1,6 +1,6 @@
- /*
- *******************************************************************************
--* Copyright (C) 1997-2014, International Business Machines Corporation and
-+* Copyright (C) 1997-2015, International Business Machines Corporation and
- * others. All Rights Reserved.
- *******************************************************************************
- *
-@@ -440,21 +440,9 @@ TimeZone::createTimeZone(const UnicodeString& ID)
+@@ -458,6 +458,8 @@ TimeZone::detectHostTimeZone()
  
- // -------------------------------------
- 
--/**
-- * Initialize DEFAULT_ZONE from the system default time zone.  
-- * Upon return, DEFAULT_ZONE will not be NULL, unless operator new()
-- * returns NULL.
-- */
--static void U_CALLCONV initDefault()
-+TimeZone* U_EXPORT2
-+TimeZone::detectHostTimeZone()
- {
--    ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
--
--    // If setDefault() has already been called we can skip getting the
--    // default zone information from the system.
--    if (DEFAULT_ZONE != NULL) {
--        return;
--    }
--    
-     // We access system timezone data through TPlatformUtilities,
-     // including tzset(), timezone, and tzname[].
-     int32_t rawOffset = 0;
-@@ -463,16 +451,6 @@ static void U_CALLCONV initDefault()
-     // First, try to create a system timezone, based
-     // on the string ID in tzname[0].
- 
--    // NOTE:  this code is safely single threaded, being only
--    // run via umtx_initOnce().
--    //
--    // Some of the locale/timezone OS functions may not be thread safe,
--    //
--    // The operating system might actually use ICU to implement timezones.
--    // So we may have ICU calling ICU here, like on AIX.
--    // There shouldn't be a problem with this; initOnce does not hold a mutex
--    // while the init function is being run.
--
      uprv_tzset(); // Initialize tz... system data
  
++    uprv_tzname_clear_cache();
++
      // Get the timezone ID from the host.  This function should do
-@@ -484,13 +462,13 @@ static void U_CALLCONV initDefault()
-     // Invert sign because UNIX semantics are backwards
-     rawOffset = uprv_timezone() * -U_MILLIS_PER_SECOND;
- 
--    TimeZone* default_zone = NULL;
-+    TimeZone* hostZone = NULL;
- 
-     /* Make sure that the string is NULL terminated to prevent BoundsChecker/Purify warnings. */
-     UnicodeString hostStrID(hostID, -1, US_INV);
-     hostStrID.append((UChar)0);
-     hostStrID.truncate(hostStrID.length()-1);
--    default_zone = createSystemTimeZone(hostStrID);
-+    hostZone = createSystemTimeZone(hostStrID);
- 
- #if U_PLATFORM_USES_ONLY_WIN32_API
-     // hostID points to a heap-allocated location on Windows.
-@@ -498,30 +476,69 @@ static void U_CALLCONV initDefault()
- #endif
- 
-     int32_t hostIDLen = hostStrID.length();
--    if (default_zone != NULL && rawOffset != default_zone->getRawOffset()
-+    if (hostZone != NULL && rawOffset != hostZone->getRawOffset()
-         && (3 <= hostIDLen && hostIDLen <= 4))
-     {
-         // Uh oh. This probably wasn't a good id.
-         // It was probably an ambiguous abbreviation
--        delete default_zone;
--        default_zone = NULL;
-+        delete hostZone;
-+        hostZone = NULL;
-     }
- 
-     // Construct a fixed standard zone with the host's ID
-     // and raw offset.
--    if (default_zone == NULL) {
--        default_zone = new SimpleTimeZone(rawOffset, hostStrID);
-+    if (hostZone == NULL) {
-+        hostZone = new SimpleTimeZone(rawOffset, hostStrID);
-     }
- 
-     // If we _still_ don't have a time zone, use GMT.
--    if (default_zone == NULL) {
-+    //
-+    // Note: This is extremely unlikely situation. If
-+    // new SimpleTimeZone(...) above fails, the following
-+    // code may also fail.
-+    if (hostZone == NULL) {
-         const TimeZone* temptz = TimeZone::getGMT();
-         // If we can't use GMT, get out.
-         if (temptz == NULL) {
--            return;
-+            return NULL;
-         }
--        default_zone = temptz->clone();
-+        hostZone = temptz->clone();
-+    }
-+
-+    return hostZone;
-+}
-+
-+// -------------------------------------
-+
-+/**
-+ * Initialize DEFAULT_ZONE from the system default time zone.  
-+ * Upon return, DEFAULT_ZONE will not be NULL, unless operator new()
-+ * returns NULL.
-+ */
-+static void U_CALLCONV initDefault()
-+{
-+    ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
-+
-+    // If setDefault() has already been called we can skip getting the
-+    // default zone information from the system.
-+    if (DEFAULT_ZONE != NULL) {
-+        return;
-     }
-+    
-+    // NOTE:  this code is safely single threaded, being only
-+    // run via umtx_initOnce().
-+    //
-+    // Some of the locale/timezone OS functions may not be thread safe,
-+    //
-+    // The operating system might actually use ICU to implement timezones.
-+    // So we may have ICU calling ICU here, like on AIX.
-+    // There shouldn't be a problem with this; initOnce does not hold a mutex
-+    // while the init function is being run.
-+
-+    // The code detecting the host time zone was separated from this
-+    // and implemented as TimeZone::detectHostTimeZone()
-+
-+    TimeZone *default_zone = TimeZone::detectHostTimeZone();
- 
-     // The only way for DEFAULT_ZONE to be non-null at this point is if the user
-     // made a thread-unsafe call to setDefault() or adoptDefault() in another
-diff --git a/source/i18n/unicode/timezone.h b/source/i18n/unicode/timezone.h
-index fa4f5bf..c3356c9 100644
---- a/source/i18n/unicode/timezone.h
-+++ b/source/i18n/unicode/timezone.h
-@@ -1,5 +1,5 @@
- /*************************************************************************
--* Copyright (c) 1997-2014, International Business Machines Corporation
-+* Copyright (c) 1997-2015, International Business Machines Corporation
- * and others. All Rights Reserved.
- **************************************************************************
- *
-@@ -273,6 +273,23 @@ public:
-     static const UnicodeString U_EXPORT2 getEquivalentID(const UnicodeString& id,
-                                                int32_t index);
- 
-+#ifndef U_HIDE_DRAFT_API
-+    /**
-+     * Creates an instance of TimeZone detected from the current host
-+     * system configuration. Note that ICU4C does not change the default
-+     * time zone unless TimeZone::adoptDefault(TimeZone*) or
-+     * TimeZone::setDefault(const TimeZone&) is explicitly called by a
-+     * user. This method does not update the current ICU's default,
-+     * and may return a different TimeZone from the one returned by
-+     * TimeZone::createDefault().
-+     *
-+     * @return  A new instance of TimeZone detected from the current host system
-+     *          configuration.
-+     * @draft ICU 55
-+     */
-+    static TimeZone* U_EXPORT2 detectHostTimeZone();
-+#endif
-+
-     /**
-      * Creates a new copy of the default TimeZone for this host. Unless the default time
-      * zone has already been set using adoptDefault() or setDefault(), the default is
-diff --git a/source/test/intltest/tztest.cpp b/source/test/intltest/tztest.cpp
-index 4111e51..76304e9 100644
---- a/source/test/intltest/tztest.cpp
-+++ b/source/test/intltest/tztest.cpp
-@@ -135,6 +135,13 @@ TimeZoneTest::TestGenericAPI()
-         infoln("WARNING: t_timezone may be incorrect. It is not a multiple of 15min.", tzoffset);
-     }
- 
-+    TimeZone* hostZone = TimeZone::detectHostTimeZone();
-+    /* Host time zone's offset should match the offset returned by uprv_timezone() */
-+    if (hostZone->getRawOffset() != tzoffset * (-1000)) {
-+        errln("FAIL: detectHostTimeZone()'s raw offset != host timezone's offset");
-+    }
-+    delete hostZone;
-+
-     UErrorCode status = U_ZERO_ERROR;
-     const char* tzver = TimeZone::getTZDataVersion(status);
-     if (U_FAILURE(status)) {
+     // any required host-specific remapping; e.g., on Windows this
+     // function maps the Date and Time control panel setting to an