[PATCH] Fix PR6744 (--export-dynamic not supported on PE)

[Dave Korn]

    Hi all,

  As suggested in PR6744, it would be helpful to make clearer that
--export-dynamic is not the way to get all your symbols exported from a shared
object on PE targets.  The attached patch enhances the documentation for
--export-dynamic to refer readers to --export-all-symbols, and updates the PE
and PE+ emulations to issue a warning if --export-dynamic is given on the
command-line, as suggested there.

  Tested on i686-pc-cygwin, natively and crossed to i686-pc-mingw32 and
x86_64-pc-mingw32 with no regressions, and eyeballed the info pages to ensure
the docs built right.

  I'll follow up with a testcase shortly.  Ok for HEAD?

ld/ChangeLog

	* ld.texinfo (--export-dynamic):  Mention --export-all-symbols.
	* emultempl/pe.em (gld_${EMULATION_NAME}_after_parse):  Issue
	warning if --export-dynamic was passed on command-line.
	* emultempl/pep.em (gld_${EMULATION_NAME}_after_parse):  Likewise.

    cheers,
      DaveK


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