[PATCH] D17120: ELF: Implement the correct semantics of .[cd]tors.

[Rui Ueyama via llvm-commits]

On Wed, Feb 10, 2016 at 11:08 PM, Simon Atanasyan <simon at atanasyan.com>
wrote:

> atanasyan added a comment.
>
> GNU ld 2.22 has the following default linker script for `.ctors/.dtors`
> sections. I am sure that other versions have the same declarations.
>
>   .ctors          :
>   {
>     KEEP (*crtbegin.o(.ctors))
>     KEEP (*crtbegin?.o(.ctors))
>     /* We don't want to include the .ctor section from
>        the crtend.o file until after the sorted ctors.
>        The .ctor section from the crtend file contains the
>        end of ctors marker and it must be last */
>     KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
>     KEEP (*(SORT(.ctors.*)))
>     KEEP (*(.ctors))
>   }
>   .dtors          :
>   {
>     KEEP (*crtbegin.o(.dtors))
>     KEEP (*crtbegin?.o(.dtors))
>     KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
>     KEEP (*(SORT(.dtors.*)))
>     KEEP (*(.dtors))
>   }
>
> So the order should be follow:
>
> 1. .ctors section from *crtbegin.o
> 2. .ctors section from *crtbegin?.o
> 3. .ctors sections from other object files except *crtend.o and *crtend?.o
> 4. .ctors.* from any files sorted by priority
> 5. .ctors sections from *crtend.o and *crtend?.o
>

I think my patch implements that order except it doesn't distinguish case 1
and 2, which is not significant I believe.
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