some clean rules don't work when some file starts with '-'

[Vincent Lefevre]

automake 1.10.1 generates a Makefile with:

mostlyclean-compile:
        -rm -f *.$(OBJEXT)

This results in:

$ /usr/bin/make clean && echo OK
[...]
rm -f *.o
rm: invalid option -- .
Try `rm ./-.o' to remove the file `-.o'.
Try `rm --help' for more information.
make[1]: [mostlyclean-compile] Error 1 (ignored)
test "" = "" || rm -f *_.c
rm -f *.lo
make[1]: Leaving directory `/home/vlefevre/software/mpfr'
OK

(and make doesn't even exit with a non-zero exit status).
The rule should have been:

mostlyclean-compile:
        -rm -f -- *.$(OBJEXT)

or:

mostlyclean-compile:
        -rm -f ./*.$(OBJEXT)

Other similar rules are in the same case.

-- 
Vincent Lefèvre <address@hidden> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)