* NEWS: mention support for forward exports in PE-COFF dll's.
* ld.texinfo: Expand documentation of EXPORT statements in PE-COFF .def files.
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2006-01-31 Danny Smith dannysmith@users.sourceforge.net
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* NEWS: Mention support for forward exports in PE-COFF dll's.
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* ld.texinfo: Expand documentation of EXPORT statements in
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PE-COFF .def files.
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2006-01-31 Filip Navara <navaraf@reactos.com>
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* deffile.h (struct def_file_export): Add field flag_forward.
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-*- text -*-
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* PE-COFF: Forward exports from DLL's can now be specified in .def files
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passed directly to ld.
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* Support for the Z80 processor family has been added.
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* Add support for the "@<file>" syntax to the command line, so that extra
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@ -5581,17 +5581,68 @@ Using a DEF file turns off the normal auto-export behavior, unless the
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Here is an example of a DEF file for a shared library called @samp{xyz.dll}:
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@example
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LIBRARY "xyz.dll" BASE=0x10000000
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LIBRARY "xyz.dll" BASE=0x20000000
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EXPORTS
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foo
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bar
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_bar = bar
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another_foo = abc.dll.afoo
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var1 DATA
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@end example
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This example defines a base address and three symbols. The third
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symbol is an alias for the second. For the complete format
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specification see ld/deffilep.y in the binutils sources.
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This example defines a DLL with a non-default base address and five
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symbols in the export table. The third exported symbol @code{_bar} is an
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alias for the second. The fourth symbol, @code{another_foo} is resolved
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by "forwarding" to another module and treating it as an alias for
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@code{afoo} exported from the DLL @samp{abc.dll}. The final symbol
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@code{var1} is declared to be a data object.
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The complete specification of an export symbol is:
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@example
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EXPORTS
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( ( ( <name1> [ = <name2> ] )
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| ( <name1> = <module-name> . <external-name>))
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[ @@ <integer> ] [NONAME] [DATA] [CONSTANT] [PRIVATE] ) *
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@end example
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Declares @samp{<name1>} as an exported symbol from the DLL, or declares
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@samp{<name1>} as an exported alias for @samp{<name2>}; or declares
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@samp{<name1>} as a "forward" alias for the symbol
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@samp{<external-name>} in the DLL @samp{<module-name>}.
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Optionally, the symbol may be exported by the specified ordinal
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@samp{<integer>} alias.
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The optional keywords that follow the declaration indicate:
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@code{NONAME}: Do not put the symbol name in the DLL's export table. It
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will still be exported by its ordinal alias (either the value specified
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by the .def specification or, otherwise, the value assigned by the
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linker). The symbol name, however, does remain visible in the import
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library (if any), unless @code{PRIVATE} is also specified.
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@code{DATA}: The symbol is a variable or object, rather than a function.
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The import lib will export only an indirect reference to @code{foo} as
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the symbol @code{_imp__foo} (ie, @code{foo} must be resolved as
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@code{*_imp__foo}).
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@code{CONSTANT}: Like @code{DATA}, but put the undecorated @code{foo} as
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well as @code{_imp__foo} into the import library. Both refer to the
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read-only import address table's pointer to the variable, not to the
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variable itself. This can be dangerous. If the user code fails to add
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the @code{dllimport} attribute and also fails to explicitly add the
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extra indirection that the use of the attribute enforces, the
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application will behave unexpectedly.
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@code{PRIVATE}: Put the symbol in the DLL's export table, but do not put
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it into the static import library used to resolve imports at link time. The
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symbol can still be imported using the @code{LoadLibrary/GetProcAddress}
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API at runtime or by by using the GNU ld extension of linking directly to
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the DLL without an import library.
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See ld/deffilep.y in the binutils sources for the full specification of
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other DEF file statements
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@cindex creating a DEF file
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While linking a shared dll, @command{ld} is able to create a DEF file
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