[Bug binutils/27666] ar doesn't create indices on Solaris/sparcv9

[ro at CeBiTec dot Uni-Bielefeld.DE]

https://sourceware.org/bugzilla/show_bug.cgi?id=27666

--- Comment #1 from Rainer Orth <ro at CeBiTec dot Uni-Bielefeld.DE> ---
When I tried a sparcv9-sun-solaris2.11 build of gdb master in
preparation for the upcoming GDB 11 release, I found that the impact of
this bug is way greater than just a couple of binutils testsuite
failures: it causes many hundreds of gdb testsuite failures due to the
same ambiguity:

(gdb) break increment
Breakpoint 1 at 0x100020368: file
/vol/src/gnu/gdb/hg/master/dist/gdb/testsuite/gdb.ada/O2_float_param/callee.adb,
line 19.
(gdb) run
Starting program:
/vol/obj/gnu/gdb/gdb/11.4-sparcv9-dist/gdb/testsuite/outputs/gdb.ada/O2_float_param/foo
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
Error while mapping shared library sections:
`/lib/64/libc.so.1': not in executable format: file format is ambiguous
Error while mapping shared library sections:
`/lib/sparcv9/ld.so.1': not in executable format: file format is ambiguous

As with binutils, reverting just the bfd/config.bfd part of the patch
returns gdb testresults back to normal.

Unless there's a considerably better (and sufficiently safe)
alternative, this is what I believe should be done.

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