ar rejects as-produced object on HP-UX 10.20

[Alexandre Oliva]

This is with H.J.Lu's binutils 2.9.5.0.21, but it is very likely to
occur with binutils CVS too:

oliva@lully% cat test.c
void foo() {}
oliva@lully% gcc -c test.c
oliva@lully% ar c libtest.a test.o
ar: can't set BFD default target to `hppa1.1-hp-hpux10.20': Invalid bfd target

-- 
Alexandre Oliva http://www.ic.unicamp.br/~oliva IC-Unicamp, Bra[sz]il
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