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50 Chapter 14. Create ﬁles needed to build and use DLLs

The second ﬁle needed for DLL creation is an exports ﬁle. This ﬁle is linked with the object ﬁles that

make up the body of the DLL and it handles the interface between the DLL and the outside world.

This is a binary ﬁle and it can be created by giving the -e option to dlltool when it is creating or

reading in a .def ﬁle.

The third ﬁle needed for DLL creation is the library ﬁle that programs will link with in order to access

the functions in the DLL. This ﬁle can be created by giving the -l option to dlltool when it is creating

or reading in a .def ﬁle.

dlltool builds the library ﬁle by hand, but it builds the exports ﬁle by creating temporary ﬁles

containing assembler statements and then assembling these. The -S command line option can be

used to specify the path to the assembler that dlltool will use, and the -f option can be used to pass

speciﬁc ﬂags to that assembler. The -n can be used to prevent dlltool from deleting these temporary

assembler ﬁles when it is done, and if -n is speciﬁed twice then this will prevent dlltool from deleting

the temporary object ﬁles it used to build the library.

Here is an example of creating a DLL from a source ﬁle dll.c and also creating a program (from an

object ﬁle called program.o) that uses that DLL:

gcc -c dll.c

dlltool -e exports.o -l dll.lib dll.o

gcc dll.o exports.o -o dll.dll

gcc program.o dll.lib -o program

The command line options have the following meanings:

-d filename

-input-def filename

Speciﬁes the name of a .def ﬁle to be read in and processed.

-b filename

-base-file filename

Speciﬁes the name of a base ﬁle to be read in and processed. The contents of this ﬁle will be

added to the relocation section in the exports ﬁle generated by dlltool.

-e filename

-output-exp filename

Speciﬁes the name of the export ﬁle to be created by dlltool.

-z filename

-output-def filename

Speciﬁes the name of the .def ﬁle to be created by dlltool.

-l filename

-output-lib filename

Speciﬁes the name of the library ﬁle to be created by dlltool.

-export-all-symbols

Treat all global and weak deﬁned symbols found in the input object ﬁles as symbols to be

exported. There is a small list of symbols which are not exported by default; see the

-no-default-excludes option. You may add to the list of symbols to not export by using the

-exclude-symbols option.

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Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Manuale Utente Pagina 56