Building recently sup'd RELENG_6 on a 5.4 box:
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c: In
function `extract_muldiv_1':
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4565:
error: syntax error before '||' token
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4573:
error: `PLUS_EXP' undeclared (first use in this function)
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4573:
error: (Each undeclared identifier is reported only once
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4573:
error: for each function it appears in.)
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4573:
error: syntax error before ',' token
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4581:
error: stray '`' in program
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4582:
error: syntax error before '{' token
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:4594:
error: syntax error before ')' token
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c: At top
level:
/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/fold-const.c:113:
warning: 'reorder_operands_p' used but never defined