[Bug target/54908] misc regressions on emutls targets remain from dynamic initialization of non-function-local TLS variables

["howarth at nitro dot med.uc.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54908

--- Comment #10 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-16 15:50:45 UTC ---
Note that the fix in comment 9 for libgomp/testsuite/libgomp.c++/pr24455.C
works for Xcode 3.2.6 and earlier on darwin10 but not Xcode 4.2. This is
because Apple broke weak symbol lookup in Xcode 4.2's linker (radr://10466868,
"-undefined dynamic_lookup linker bug"). This issue wasn't fixed until Xcode
4.4 (which is only available on darwin11 and darwin12). 

Note that a simple testcase for this bug is...

--------------- weak.c ---------------------
#include <stdio.h>

char *myweakfunc(void) __attribute__((weak)) ;

int main(int argc, char **argv)
{
  if (myweakfunc)
    printf ("found myweakfunc %s\n", myweakfunc());
  else
    printf("Weak func not found\n");
  return 0;
}
--------------------------------------------

% gcc weak.c -o wk -undefined dynamic_lookup
% ./wk
Weak func not found