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Re: Bug in gcc and/or binutils?
- From: Danny Smith <dannysmith at clear dot net dot nz>
- To: Cygwin <cygwin at cygwin dot com>
- Date: Fri, 16 Sep 2005 17:36:30 +1200
- Subject: Re: Bug in gcc and/or binutils?
- Reply-to: Danny Smith <dannysmith at users dot sourceforge dot net>
References: <http://sources.redhat.com/ml/cygwin/2005-09/msg00471.html>
<http://sources.redhat.com/ml/cygwin/2005-09/msg00519.html>
Charles Wilson <cygwin at cwilson dot fastmail dot fm> wrote:
>
> Using .def files turns off the auto-EXport logic (which it should,
> because if you specify a specific set of exports you don't want binutils
> adding a few more on its own).
There seems to be a common misconception that auto-export logic and
explicit designation of exports are incompatible.
You can still use --export-all (to get the auto-export of all defined
symbols) with a .def file or with __declspec(dllexport).
eg
gcc -shared -ofoo.dll foo.def foo.c -Wl,--export-all
The use of a def file (with --export-all) is useful when you want to
export all symbols but want special handling of some, say an alias or
marking a symbol as PRIVATE (exclude from import lib) or NONAME (exclude
the name of the symbol from the dll's export table), (almost like
__attribute__((hidden)) Or you may want to add a symbol that is just
forwarded to another dll. Or you have a function foo() but only want
the indirect ref __imp__foo visible in the import lib, and not the label:
foo:
jmp * __imp__foo
so you only export the pointer by marking as DATA in the def file
Danny
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