refs #6286 Fix compile for CLANG.

Enabled some more asserts, disabled some static asserts for clang because it does not support constexprs

git-svn-id: file:///svn/toku/tokudb@54540 c7de825b-a66e-492c-adef-691d508d4ae1

util/partitioned_counter.h

@@ -61,22 +61,43 @@ void partitioned_counters_destroy(void);
 /*
 */
 
-#define TOKUDB_STATUS_INIT(array,k,c,t,l,inc) do { \
-    array.status[k].keyname = #k;                    \
-    array.status[k].columnname = #c;                 \
-    array.status[k].type    = t;                     \
-    array.status[k].legend  = l;                     \
-    static_assert((inc) != 0, "Var must be included in at least one place"); \
+#if defined(__clang__)
+// clang does not yet support constexprs, so cannot use strcmp, strncmp, etc in static_asserts
+#define TOKUDB_STATUS_INIT_CONSTEXPR_ASSERTS(c, inc) do { } while (0)
+#else
+
+constexpr char UU() static_tolower(const char a) {
+    return a >= 'A' && a <= 'Z' ? a - 'A' + 'a' : a;
+}
+
+constexpr int UU() static_strncasecmp(const char *a, const char *b, size_t len) {
+    return len == 0 ? 0 : (
+         static_tolower(*a) != static_tolower(*b)  || *a == '\0' ?
+         static_tolower(*a) - static_tolower(*b) :
+         static_strncasecmp(a+1, b+1, len-1)
+        );
+}
+
+#define TOKUDB_STATUS_INIT_CONSTEXPR_ASSERTS(c, inc) do { \
     static_assert(strcmp(#c, "NULL") && strcmp(#c, "0"),                     \
             "Use nullptr for no column name instead of NULL, 0, etc...");    \
     static_assert((inc) == TOKU_ENGINE_STATUS || strcmp(#c, "nullptr"),      \
             "Missing column name.");                                         \
-    static_assert(strncmp(#c, "TOKU", strlen("TOKU")) &&                     \
-                  strncmp(#c, "toku", strlen("toku")),                       \
+    static_assert(static_strncasecmp(#c, "TOKU", strlen("TOKU")),            \
                   "Do not start column names with toku/tokudb.  Names get TOKUDB_ prefix automatically."); \
     static_assert((inc) == TOKU_ENGINE_STATUS ||                             \
             (strcmp(#c, "nullptr") && strcmp(#c, "NULL") && strcmp(#c, "0")) \
             , "Missing column name.");                                       \
+    } while (0)
+#endif
+
+#define TOKUDB_STATUS_INIT(array,k,c,t,l,inc) do { \
+    array.status[k].keyname = #k;                    \
+    array.status[k].columnname = #c;                 \
+    array.status[k].type    = t;                     \
+    array.status[k].legend  = l;                     \
+    static_assert((inc) != 0, "Var must be included in at least one place"); \
+    TOKUDB_STATUS_INIT_CONSTEXPR_ASSERTS(c, inc);    \
     array.status[k].include = static_cast<toku_engine_status_include_type>(inc);  \
     if (t == PARCOUNT) {                                               \
         array.status[k].value.parcount = create_partitioned_counter(); \