Compiling with -Os brings it down to 800 KB.

  % gcc -c sqlite3.c
  % ls -l sqlite3.o
  -rw-r--r--  1 dalke  admin  1270372 Feb  6 04:11 sqlite3.o
  % gcc -c sqlite3.c -Os
  % ls -l sqlite3.o
  -rw-r--r--  1 dalke  admin  805044 Feb  6 04:12 sqlite3.o

  % clang -c sqlite3.c
  % ls -l sqlite3.o
  -rw-r--r--  1 dalke  admin  1248704 Feb  6 04:15 sqlite3.o
  % clang -c -Os sqlite3.c
  % ls -l sqlite3.o
  -rw-r--r--  1 dalke  admin  796888 Feb  6 04:16 sqlite3.o

778 KiB is still some 50% larger than 500.