What else do I need to do to allow BLOB's up to int32_t max value?

I defined SQLITE_MAX_LENGTH=2147483647, but this

#include <stdio.h>
#include "sqlite3.h"

int main(int argc, char *argv[]) {
  sqlite3 *pDb;
  sqlite3_stmt *pStmt;
  char *pzErr;

  int rc = sqlite3_open(":memory:", &pDb);
  char *sql = "drop table if exists t2;"
    "create table t2 (id INTEGER PRIMARY KEY, a BLOB);"
    "insert into t2 values (1, zeroblob(2147483647)); ";
  rc = sqlite3_exec(pDb, sql, NULL, NULL, &pzErr);
  if (rc) {
    printf("%s", pzErr);
    sqlite3_free(pzErr);
  }
}

results in string or blob too big

I'm compiling on Windows with VS2015 (MSVC 1900). I can't debug SQLite very well because the VS debugger is terrified of the amalgamation (even when it is part of the source tree). I tried to set a breakpoint in the zeroblobFunc() implementation, but the debugger won't hit.

from the sqlite3.c amalgamation:

#define SQLITE_VERSION        "3.37.2"
#define SQLITE_VERSION_NUMBER 3037002
#define SQLITE_SOURCE_ID      "2022-01-06 13:25:41 872ba256cbf61d9290b571c0e6d82a20c224ca3ad82971edc46b29818d5d17a0"

That's how you change the max size of a BLOB, but note this from the documentation:

During part of SQLite's INSERT and SELECT processing, the complete content of each row in the database is encoded as a single BLOB. So the SQLITE_MAX_LENGTH parameter also determines the maximum number of bytes in a row.

So, you need to account for the size of the complete row, meaning in practice you can't insert a blob bigger than (SQLITE_MAX_LENGTH-8) or so, depending on what's in the row.