[Aboriginal] Using native-build.sh for An Android native C compiler

[Earlence Fernandes]

>Weird, .a files are static libraries, not dynamic libraries.  I didn't
>think dlopen could do anything useful with them.  Huh.

sorry! typo! I meant libm.so :)

Thanks for the other pointers, I'll read them'

-Earlence

On Mon, Jul 18, 2011 at 5:02 AM, Rob Landley <rob at landley.net> wrote:

> On 07/16/2011 02:05 PM, Earlence Fernandes wrote:
> >>Have you tried to dlopen() one of the other shared libraries that comes
> >>with uClibc just to make sure that the issue is dlopen() and not it
> >>being really confused by that particular library?
> >
> > I tried it with libm.a shipped with my native compiler. It worked ok!!
> >
> > strange that is doesn't open /system/lib/libc.so
> > Thoughts?
> >
> > -Earlence
>
> Weird, .a files are static libraries, not dynamic libraries.  I didn't
> think dlopen could do anything useful with them.  Huh.
>
> Shared libraries have all sorts of funky hooks and things, initializion
> code, different types of relocations (REL vs RELA, lazy binding needs
> its own extra set of tables, and of course the gnu guys extended elf
> with their own hash stuff as blogged about
> http://blogs.oracle.com/ali/entry/gnu_hash_elf_sections ...
>
> There's a marvelous set of blog entries on writing a linker by the guy
> who did GOLD, it's linked to as reference #1 from the gold wikipedia entry:
>
>  http://en.wikipedia.org/wiki/Gold_(linker)
>
> Denys Vlasenko did a marvelous talk on some linker subtleties he
> encountered, the video of which is one of these:
>
>  http://free-electrons.com/blog/elc-2010-videos/
>
> If you want to learn about how linkers work, the standard reference is:
>
>  http://www.iecc.com/linker/
>
> Plus the ELF spec:
>
>  http://refspecs.freestandards.org/elf/
>
> So it's entirely possible something is subtly wrong with that .so
> because they wrote their own dynamic linker that doesn't use all the
> fields the others do, and thus uClibc's following an unexpected null
> pointer or something.  But that's just a guess.
>
> Rob
>
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