RE: dynamic libraries: custom _init() without losing default _init()

["Zagorodnev, Grigory" <grigory dot zagorodnev at intel dot com>]

Hi, Matze!
I'm actually surprised that preinit_array disallowed for DSO. 

Thus you may try to use ".init_array" section in the same manner. That
works fine for DSO but makes your initialization routine called _after_
C++ file-scope object constructors. Does the order really matter?

- Grigory

>-----Original Message-----
>From: matze [mailto:matze@indymedia.org]
>Sent: Wednesday, March 30, 2005 2:34 AM
>To: Zagorodnev, Grigory
>Cc: gcc-help@gnu.org
>Subject: Re: dynamic libraries: custom _init() without losing default
>_init()
>
>El Wed, Mar 30, 2005 at 01:05:26AM +0400 Zagorodnev, Grigory ha dit:
>
>> >to initialize the dynamic library a custom _init() is called. is it
>> >possible to call default _init() from the custom one or is there
>> >another way to invoke a custom function from default _init() or
>> >directly afterwards?
>>
>> It would be safer to not override default startup code, but use one
of
>> the following:
>>
>> Once your code is C++ you can create file-scope instance of some
>> initialization class so its constructor will do the work. This is
most
>> portable approach.
>>
>> In case library initialization code must be executed _before_ any C++
>> object constructor, you may use ".preinit_array"
>> 	static preinit(int argc, char *argv[]);
>> 	static void (*const preinit_ptr) (int argc, char *argv[])
>> 	     __attribute__ ((section (".preinit_array"))) = &preinit;
>
>thanks for your answer grigory, if that works it's actually cook :)
>
>i tried it, but the linker complains about the following:
>
>matze@assata:/tmp$ g++ -shared foo.cpp -o foo.so
>/usr/bin/ld: /tmp/cc1zrrRc.o: .preinit_array section is not allowed in
>DSO
>
>any idea?
>
>matze
>
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