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Date: Sat, 6 Oct 2012 22:39:39 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: TLS (thread-local storage) support
* Szabolcs Nagy <nsz@...t70.net> [2012-10-06 16:33:01 +0200]:
> should the attached code work with dlopen
> when compiled as a dso?
>
> (i wanted to check if the alignments are ok after a dlopen,
> but i can see how this usage may not be supported)
>
> it seems it dies here in the ctor
a more minimal example:
a.c:
__thread int xx;
int *p;
__attribute__((constructor)) static void init(void)
{
p = &xx;
}
b.c:
#include <dlfcn.h>
void *h;
int main()
{
h = dlopen("./a.so", RTLD_LAZY);
}
compiled as
musl-gcc -shared -fPIC -g -o a.so a.c
musl-gcc -g -o b b.c
./b segfaults in init at p=&xx
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