Supress newlines in gcc -E macro expansion?

[Todd Plessel]

$ cat macro_test.c
#define MACRO(a,b) a and b
MACRO( first,
       second )
$ gcc -E macro_test.c
# 1 "macro_test.c"

  first  and
       second
$ cc -E macro_test.c
# 1 "macro_test.c"
# 2
 first and second
#ident "acomp: Sun WorkShop 6 2000/04/07 C 5.1"

How can I get gcc -E to produce:

  first and second

like cc -E?

Thanks.

Todd