Update the built procedures for the sqlite3_analyzer utility to allow it

to be linked with an external sqlite3.o library.  Automatically detect a
missing dbstat extension and report the compile-time error.

FossilOrigin-Name: bb39744f4b2b25c10d293e85db7579e2a99c639fdab45e93d1de75952b68b2de

tool/spaceanal.tcl

@@ -1,7 +1,9 @@
-# Run this TCL script using "testfixture" in order get a report that shows
-# how much disk space is used by a particular data to actually store data
+# Run this TCL script using an SQLite-enabled TCL interpreter to get a report
+# on how much disk space is used by a particular data to actually store data
 # versus how much space is unused.
 #
+# The dbstat virtual table is required.
+#
 
 if {[catch {
 
@@ -147,6 +149,17 @@ if {$flags(-debug)} {
   db trace ::dbtrace
 }
 
+# Make sure all required compile-time options are available
+#
+if {![db exists {SELECT 1 FROM pragma_compile_options
+                WHERE compile_options='ENABLE_DBSTAT_VTAB'}]} {
+  puts "The SQLite database engine linked with this application\
+        lacks required capabilities. Recompile using the\
+        -DSQLITE_ENABLE_DBSTAT_VTAB compile-time option to fix\
+        this problem."
+  exit 1
+}
+
 db eval {SELECT count(*) FROM sqlite_master}
 set pageSize [expr {wide([db one {PRAGMA page_size}])}]
 

tool/sqlite3_analyzer.c.in

@@ -14,7 +14,9 @@
 #define SQLITE_DEFAULT_MEMSTATUS 0
 #define SQLITE_MAX_EXPR_DEPTH 0
 #define SQLITE_OMIT_LOAD_EXTENSION 1
+#ifndef USE_EXTERNAL_SQLITE
 INCLUDE sqlite3.c
+#endif
 INCLUDE $ROOT/src/tclsqlite.c
 
 const char *sqlite3_analyzer_init_proc(Tcl_Interp *interp){