Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Manuale Utente Scaricare il pdf (Pagina 55)

Chapter 14.

Create ﬁles needed to build and use DLLs

dlltool may be used to create the ﬁles needed to build and use dynamic link libraries (DLLs).

Warning: dlltool is not always built as part of the binary utilities, since it is only useful for those targets

which support DLLs.

dlltool [-d|--input-def def-file-name]

[-b|--base-file base-file-name]

[-e|--output-exp exports-file-name]

[-z|--output-def def-file-name]

[-l|--output-lib library-file-name]

[--export-all-symbols] [--no-export-all-symbols]

[--exclude-symbols list]

[--no-default-excludes]

[-S|--as path-to-assembler] [-f|--as-flags options]

[-D|--dllname name] [-m|--machine machine]

[-a|--add-indirect] [-U|--add-underscore] [-k|--kill-at]

[-A|--add-stdcall-alias]

[-p|--ext-prefix-alias prefix]

[-x|--no-idata4] [-c|--no-idata5] [-i|--interwork]

[-n|--nodelete] [-t|--temp-prefix prefix]

[-v|--verbose]

[-h|--help] [-V|--version]

[object-file ...]

dlltool reads its inputs, which can come from the -d and -b options as well as object ﬁles speciﬁed

on the command line. It then processes these inputs and if the -e option has been speciﬁed it creates

a exports ﬁle. If the -l option has been speciﬁed it creates a library ﬁle and if the -z option has been

speciﬁed it creates a def ﬁle. Any or all of the -e, -l and -z options can be present in one invocation

of dlltool.

When creating a DLL, along with the source for the DLL, it is necessary to have three other ﬁles.

dlltool can help with the creation of these ﬁles.

The ﬁrst ﬁle is a .def ﬁle which speciﬁes which functions are exported from the DLL, which func-

tions the DLL imports, and so on. This is a text ﬁle and can be created by hand, or dlltool can be

used to create it using the -z option. In this case dlltool will scan the object ﬁles speciﬁed on its

command line looking for those functions which have been specially marked as being exported and

put entries for them in the .def ﬁle it creates.

In order to mark a function as being exported from a DLL, it needs to have an

-export:

name_of_function entry in the .drectve section of the object ﬁle. This can be

done in C by using the asm() operator:

asm (".section .drectve");

asm (".ascii \"-export:my_func\"");

int my_func (void) { ... }

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Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Manuale Utente Pagina 55