Shared library and TLS variables

[Bharath Ramesh <bramesh at vt dot edu>]

I am wondering if there is any minimal size that is required for
TLS when variables are declared in a shared library. I am having
an issue when I declare a single TLS variable of type char. I
access this variable from my application. When I run a simple
test case I am able to reproduce this behavior. There is an issue
during the allocation of the static TLS block when the shared
library is being loaded. If I change the type of the variable
from char to int it works as expected. I am attaching the
associated test code along with this email.

libfoo is compiled as follows:

gcc -Wall -Wextra -fPIC -shared -o libfoo.so foo.c

test is compiled as follows:

gcc -Wall -Wextra -Wl,-rpath . -o test test.c -L . -lfoo

When I execute it I get the following error:

$ ./test 
./test: error while loading shared libraries: ./libfoo.so: cannot allocate memory in static TLS block

-- 
Bharath

#include <stdint.h>
#include <stdio.h>

__thread char foo = 1;

void bar(void)
{
	printf("address of foo: %p\n", &foo);
	return;
}

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

extern void bar(void);

extern __thread char foo;

int main(int argc, char *argv[])
{
	printf("foo: %d\n", foo);
	bar();

	return EXIT_SUCCESS;
}