Should --enable-checking=yes,rtl work on 32-bit hosts?

[H.J. Lu]

For GCC 8, when --enable-checking=yes,rtl is used with x32 GCC,
I got

cc1plus: out of memory allocating 56137200 bytes after a total of
3139436544 bytes
make[5]: *** [Makefile:1104: insn-extract.o] Error 1
make[5]: *** Waiting for unfinished jobs....

gcc-7-branch is OK.  Is this expected?

-- 
H.J.