On Friday 2013-10-25 11:24, Thiago Macieira wrote:
>> Even if it isn't that "minor" of an issue, the correct thing to do here
>> is to dlopen it, as that removes this type of issue completely.
>
>That's what we'll do. It's just a sub-optimal solution, compared to direct &
>normal linking -- which is something we need to enable for distros to do.
>
>The drawbacks of this solution are:
> - no link-time dependency for packaging tools to detect and create the
> package dependency without intervention
Given most .run-type software bypasses package tools already,
there is not much more to lose.
> - sub-optimal resolution and calling (hand-written code worse than linker-
> generated PLT)
How worse is it, actually?
5 void *h = dlopen("libc.so.6", RTLD_LAZY);
(gdb) n
6 int (*scmp)(const char *, const char *) = dlsym(h, "strcmp");
(gdb)
7 return scmp(argv[0], "x.c") == 0;
(gdb) p scmp
$1 = (int (*)(const char *, const char *)) 0x7ffff7953c40 <__strcmp_ssse3>
So even though I used the, as you call it, "suboptimal" dlopen mechanism,
I do get the SSSE3-optimized variant. Can't be _that_ bad.
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