PR c++/5287, PR c++/7910, PR c++/11021
* config/i386/winnt.c (ix86_handle_dll_attribute): Don't add
dllimport attribute if function is defined at declaration, but
report error instead. Likewise for dllimport'd variable
definitions. Set implicit TREE_PUBLIC for dllimport'd variables
declared within functions, Report error if dllimport or dllexport
symbol is not global.
(i386_pe_dllimport_p): Ignore dllimport attribute of functions
if defined after declaration or if inlined. Don't allow definition
of static data members of C++ classes. Don't dllimport virtual
methods.
(i386_pe_mark_dllexport): Warn about inconsistent dll attributes.
(i386_pe_mark_dllimport): Remove unnecessary checks.
(i386_pe_encode_section_info): Warn if the dllimport attribute
and symbol prefix have been instantiated and then overridden.
* doc/extend.texi: Document dllimport and dllexport attributes.
* config/i386/winnt.c (i386_pe_output_labelref): Fix indents.
From-SVN: r68916
