Parallel build error

[Richard Henderson]

For the past couple of years I've simply ignored these problems by
ritually adding 'echo .NOTPARALLEL: >> Makefile' to my top-level
issue-the-long-configure-option scripts.

But I suppose the reason why these never get fixed is no one reporting...
This one happened shockingly early.

 $ make -j4 all-stage1
 make[1]: Entering directory `/home/rth/work/gcc/bld-nat'
 make[1]: Entering directory `/home/rth/work/gcc/bld-nat'
 make[1]: Entering directory `/home/rth/work/gcc/bld-nat'
 make[1]: Entering directory `/home/rth/work/gcc/bld-nat'
 mkdir: cannot create directory `stage1-gcc': File exists
 mv: cannot move `stage1-gcc' to `gcc': No such file or directory
 make[1]: *** [stage1-start] Error 1
 make[1]: Leaving directory `/home/rth/work/gcc/bld-nat'
 make: *** [configure-stage1-libiberty] Error 2
 make: *** Waiting for unfinished jobs....



r~