2010-04-27 Kai Tietz <kai.tietz@onevision.com>

2010-04-27  Kai Tietz  <kai.tietz@onevision.com>

	* pe-x86_64.c (TARGET_UNDERSCORE): Set value dependent
	to USE_MINGW64_LEADING_UNDERSCORES.
        * pei-x86_64.c (TARGET_UNDERSCORE): Likewise.
	* config.bfd: Change underscoring default for x64 mingw
	to false.
	* coffcode.h (coff_write_relocs): Add check that dereferenced
	sym_ptr_ptr isn't NULL.
	* config.in (USE_MINGW64_LEADING_UNDERSCORES): New.
	* configure: Regenerated.
	* configure.in: Add option '--enable-leading-mingw64-underscores'
	and define config.in variable USE_MINGW64_LEADING_UNDERSCORES.