cannot handle all opcodes we need.
$(CC) -xarch=v8plus -c asm/sparcv8plus.S -o asm/sparcv8plus.o
asm/sparcv8plus-gcc.o: asm/sparcv8plus.S
- gcc -E asm/sparcv8plus.S | as -xarch=v8plus /dev/fd/0 -o asm/sparcv8plus-gcc.o
+ gcc -E asm/sparcv8plus.S | /usr/ccs/bin/as -xarch=v8plus /dev/fd/0 -o asm/sparcv8plus-gcc.o
+ # GNU as cannot handle that file, so we circumvent PATH and
+ # always use /usr/ccs/bin/as.
# MIPS 64 bit assember
asm/mips3.o: asm/mips3.s