(is_elf_format): New, extracted from...
* ld-scripts/weak.exp: ...here.
* ld-scripts/overlay-size.exp: New test.
* ld-scripts/overlay-size.[tsd],
* ld-scripts/overlay-size-map.d: New files for it.
* ld-scripts/cross1.t: Add .opd.
* ld-undefined/undefined.exp: Allow leading dot on sym names.
* lib/ld-lib.exp (default_ld_nm): Strip leading dots from syms.
OBJCOPYFLAGS, READELF, READELFFLAGS, LD, LDFLAGS): Provide
default.
* lib/ld-lib.exp (run_dump_test): Import from gas testsuite. Add
new options "ld", "source", "xfail", "target", "notarget" and
"error". Support the runtest_file_p "*.exp=testname" feature.
(slurp_options, regexp_diff, file_contents, verbose_eval): Import
from gas testsuite.
* testsuite/ld-scripts/crossref.exp: Initialize flags to
[big_or_little_endian].
* testsuite/ld-undefined/undefined.exp: Ditto, and include $flags
in ld invocations.
* testsuite/lib/ld-lib.exp (big_or_little_endian): Recognize -EB,
-eb, EL and el.
(is_endian_output_format): New function.
(default_ld_link): Set flags to [big_or_little_endian] only if ld
is being invoked such that the output format being used is of
known endianness.
(default_ld_simple_link): Ditto.
