[LLVMdev] [lld] Handling multiple -init/-fini command line options

Shankar Easwaran shankare at codeaurora.org
Mon Dec 8 09:39:01 PST 2014

On 12/8/2014 11:09 AM, Joerg Sonnenberger wrote:
> On Mon, Dec 08, 2014 at 10:21:49AM -0600, Shankar Easwaran wrote:
>> The DT_INIT/DT_FINI correspond to one initializer function,where as
>> DT_INIT_ARRAY/DT_FINI_ARRAY is used when there is more than one
>> initalizer function/finalizer function respectively.
> This is not true. The difference is that the DT_INIT / DT_FINI function
> is responsible for calling into the .init / .fini block and for
> DT_INIT_ARRAY / DT_FINI_ARRAY, the block is explicitly defined as a
> list of pointers and it is the responsibility of either the CRT logic or
> the dynamic linker to call them.
> That said, I don't think more than one DT_INIT / DT_FINI entry should be
> allowed as the latter entry will overwrite the earlier ones.
Thanks Joerg, The snip of code that appears to run the init/fini was 
easily browseable with musl.

http://git.musl-libc.org/cgit/musl/tree/src/ldso/dynlink.c (function: 

That said, all of the code is essentially under NO_LEGACY_INITFINI, is 
the linker responsible to convert DT_INIT to DT_INITARRAY's ?

If so, I think more than one init/fini option should be converted to 
DT_INIT_ARRAY (or) DT_FINI_ARRAY respectively ?

Shankar Easwaran

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation

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