[AD] [ alleg-Bugs-3157005 ] Dynamic linker can't find _al_managled_main with XCode4

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Bugs item #3157005, was opened at 2011-01-13 08:59
Message generated for change (Comment added) made by elias
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Category: Mac OSX
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Owen Anderson (resistor)
Assigned to: Peter Hull (peterhull90)
Summary: Dynamic linker can't find _al_managled_main with XCode4

Initial Comment:
The XCode4 Developer Preview has -fvisibility=hidden on by default, which makes the dynamic linker unable to resolve it at runtime.  This option is good for both launch time and optimization, so it's desirable to have it on.  Given that, please consider adding "__attribute__ ((visibility("default")))" to the OS X declaration of _al_mangled_main.

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>Comment By: Elias Pschernig (elias)
Date: 2011-01-15 04:51

Message:
Ah, yes, I keep forgetting that under OSX the user main() is just some
weird macro. Makes sense then.


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Comment By: Owen Anderson (resistor)
Date: 2011-01-15 03:39

Message:
That's not the same situation.  The user's main is rewritten to
_al_mangled_main on OS X, and is in the user's linked binary.  The real
main is in allegro_main.dylib, which calls _al_mangled_main on launch. 
This means that _al_mangled_main has to be public, rather than hidden, even
though it's in the user's code rather than in the Allegro dynamic library.

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Comment By: Elias Pschernig (elias)
Date: 2011-01-14 14:44

Message:
Does Allegro compile with -fvisibility=hidden at all? We don't set any
symbols to __attribute__ ((visibility("default"))) from what I can see. And
all non-public functions are declared static anyway. (Functions starting
with _al_ are public if user code includes any of the allegro5/internal/*
headers.)

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