[Intl] Add static_assert of icu version >= 63

Bug: v8:8424
Change-Id: Ic4f5b229dca4c3a802701aaa6e2093e280739a78
Reviewed-on: https://chromium-review.googlesource.com/c/1328646Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57444}

src/objects/intl-objects.cc

@@ -34,6 +34,15 @@
 #include "unicode/numsys.h"
 #include "unicode/timezone.h"
 #include "unicode/ustring.h"
+#include "unicode/uvernum.h"  // U_ICU_VERSION_MAJOR_NUM
+
+#define XSTR(s) STR(s)
+#define STR(s) #s
+static_assert(
+    V8_MINIMUM_ICU_VERSION <= U_ICU_VERSION_MAJOR_NUM,
+    "v8 is required to build with ICU " XSTR(V8_MINIMUM_ICU_VERSION) " and up");
+#undef STR
+#undef XSTR
 
 namespace v8 {
 namespace internal {

src/objects/intl-objects.h

@@ -20,6 +20,8 @@
 #include "unicode/locid.h"
 #include "unicode/uversion.h"
 
+#define V8_MINIMUM_ICU_VERSION 63
+
 namespace U_ICU_NAMESPACE {
 class BreakIterator;
 class DecimalFormat;