[Bug-zile] Problems with parallel build

[Reuben Thomas]

When running "make prerelease", I get random errors like this:

  CC     src/undo.o
  CC     src/variables.o
  CC     src/window.o
  CC     src/memrmem.o
  CC     src/memrmem.o
  CC     src/astr.o
  CC     src/estr.o
mv: cannot stat `src/.deps/memrmem.Tpo': No such file or directory

It's always a problem with .Tpo files and, as here, it's always a file
that make is attempting to make twice at the same time, presumably
triggering a race condition. I can't see from the Makefile why it's
even trying to make the same dependency twice. memrmem is perhaps a
bad example, as it's a dependency of astr (the test program) as well
as of zile, but I've had the same problem with e.g. basic.o getting
built twice. src/basic.$(OBJEXT) is only listed once in Makefile.

I have:

$ echo $MAKEFLAGS
-j 4 -l 4.0

Any ideas?

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