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Re: [patch bfd]: Fix PR ld/12742 for windows targets

On Sat, Mar 10, 2012 at 4:06 AM, Kai Tietz <> wrote:
> 2012/3/10 Jeffrey Walton <>:
>> On Sat, Mar 10, 2012 at 3:58 AM, Jeffrey Walton <> wrote:
>>> On Fri, Mar 9, 2012 at 2:54 PM, Kai Tietz <> wrote:
>>>> Hi,
>>>> this patch adds compatible implementation of dlfcn API on Windows
>>>> targets, if this header/API isn't present.
>>>> ChangeLog
>>>> 2012-03-09 ÂKai Tietz Â<>
>>>> Â Â Â ÂPR ld/12742
>>>> Â Â Â Â* (AC_CHECK_HEADERS): Test for windows.h and dlfcn.h.
>>>> Â Â Â Â* plugin.c: Guard include of dlfcn.h if HAVE_DLFCN_H is defined.
>>>> Â Â Â ÂAdd windows.h header include if HAVE_WINDOWS_H is defined.
>>>> Â Â Â Â(dlerror): New static function if windows variant is used instead
>>>> Â Â Â Âof dlfcn.h.
>>>> Â Â Â Â(dlclose): Likewise.
>>>> Â Â Â Â(dlopen): Likewise.
>>>> Â Â Â Â(dlsym): Likewise.
>>>> Â Â Â Â* configure: Regenerated.
>>>> Â Â Â Â* Regenerated.
>>>> Tested for i686-w64-mingw32 and x86_64-w64-mingw32. ÂOk for apply?
>>>> Regards,
>>>> Kai
>>>> [SNIP]
>>> If filename is NULL, I believe LoadLibrary will treat the filename as
>>> an ordinal. Perhaps you should explicitly test the char* against NULL
>>> (unless, of course, you want to return the function at ordinal 0):
>>>> +dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
>>>> +{
>>>> + Âreturn LoadLibrary (file);
>>>> +}
>>> I think you wil get expected behavior if there are no ordinals, which
>>> means you might have an intermittent problem.
>> My bad - I meant function name:
>> +static void *
>> +dlsym (void *handle, const char *name)
>> +{
>> + Âreturn GetProcAddress (handle, name);
> GetProcAddress with name of NULL is simply invalid. ÂAny ordinal has
> to start at 1 AFAIK. ÂOrdinal 0 doesn't exists.
> See
> for more details.
Ah, you're right. I seem to recall being able to do that in the past
(perhaps with VS 5 or 6). VS 2008 errors with:

Dll-Test.def(4) : fatal error LNK1119: invalid ordinal number '0'


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