[Bug lto/89896] -flto=4 is confused by presence of 'all.c' in a local directory. -flto=1 is not.

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89896

--- Comment #6 from Andreas Schwab <sch...@linux-m68k.org> ---
Just make the target .PHONY.