Mail Archives: cygwin-apps/2002/04/25/05:42:19
--- Ralf Habacker <Ralf DOT Habacker AT freenet DOT de> wrote: > Hi,
> this patch fixes an cygwin ld issue (GNU ld version 2.11.92 20011001) I've
> encountered while analysing the runtime linking performance for kde.
>
> Background:
>
> The ld-auto-import stuff introduces additional symbols (_nm_...) in the
> import
> library which are only needed for data exports.
> Unfortunally this symbols are generated for every export.
> Additional ld rexports imported "_nm_" symbols from other dlls, so one get
> symbols like "_nm___nm__scanf" for example.
>
> One can say this isn't a real problem and the answer is yes ... for little
> dll's.
> But if you look in the below mentioned import libraries, one can save about
> 30%
> of the import libraries size.
> For the kde 2.2.2 devel libs and base package this would save about 26MB.
> And this seems to be a fact for applying this fix.
>
> without patch
> -rwxrwxrwx 1 1002 Kein 3190016 Apr 20 19:12 libkdecore.dll.a
> -rwxrwxrwx 1 1002 Kein 7526 Apr 20 19:01 libkdefakes.dll.a
> -rwxrwxrwx 1 1002 Kein 5693370 Apr 20 01:16 libkdeui.dll.a
>
>
> with patch
> -rwxrwxrwx 1 1002 Kein 2126660 Apr 25 10:48 libkdecore.dll.a
> -rwxrwxrwx 1 1002 Kein 1448 Apr 25 10:45 libkdefakes.dll.a
> -rwxrwxrwx 1 1002 Kein 3622512 Apr 25 11:06 libkdeui.dll.a
>
>
> $ diff pe-dll.c.orig pe-dll.c -ubBp
> --- pe-dll.c.orig Wed Apr 24 09:48:59 2002
> +++ pe-dll.c Thu Apr 25 08:33:08 2002
> @@ -248,6 +250,8 @@ static autofilter_entry_type autofilter_
> /* Do __imp_ explicitly to save time. */
> { "__rtti_", 7 },
> { "__builtin_", 10 },
> + // RH: prevent generating reimported functions
> + { "_nm_", 4 },
> /* Don't export symbols specifying internal DLL layout. */
> { "_head_", 6 },
> { "_fmode", 6 },
> @@ -1789,6 +1793,8 @@ make_one (exp, parent)
> quick_symbol (abfd, U ("_imp__"), exp->internal_name, "", id5, BSF_GLOBAL,
> 0);
> /* Symbol to reference ord/name of imported
> symbol, used to implement auto-import. */
> + /* RH: only for auto-imported data */
> + if (exp->flag_data)
> quick_symbol (abfd, U("_nm__"), exp->internal_name, "", id6, BSF_GLOBAL,
> 0);
> if (pe_dll_compat_implib)
> quick_symbol (abfd, U ("__imp_"), exp->internal_name, "",
>
> Any comments ?
>
> Regards
> Ralf Habacker
>
>
Yes, this looks very nice, but does it works against current CVS? I hope you
can say yes.
Danny.
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