[patch rfa] add --no-export-dynamic option to ld (for parity with gold)

[Chris Demetriou]

gold supports the --no-export-dynamic option to undo the effect of
--export-dynamic.  This patch adds a similar flag to ld.

I realize that the testsuite change is ... umm, cheap?  but it wasn't
obvious to me a better place to test this change, the test I enhanced
already tests with and without --export-dynamic, and it seems likely
that anybody releasing a new binutils is likely to test ELF support
first, so if the option magically breaks this test will be good enough
to catch it.  8-)

built on i686-linux, tested with no failures.  (I did some manual
tweaking to make sure that the test failed if the option had no
effect, too.)


chris
---
[ld/ChangeLog]
2009-04-29  Chris Demetriou  <cgd@google.com>

        * lexsup.c (option_values): Add OPTION_NO_EXPORT_DYNAMIC.
        (ld_options): Likewise.
        (parse_args): Likewise.
        * ld.texinfo: Document --no-export-dynamic.
        * NEWS: Mention --no-export-dynamic.

[ld/testsuite/ChangeLog]
2009-04-29  Chris Demetriou  <cgd@google.com>

        * ld-elfvers/vers.exp (vers4b): New test to verify that
        --no-export-dynamic undoes --export-dynamic.
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