[PATCH] Small __asm__ fix for Alpha linuxthreads.

[Glen Nakamura]

Aloha,

This patch fixes a problem I encountered when compiling glibc-2.2.5
with gcc-3.1 on alpha linux.  The problem results in a segmentation fault
in pthread_setspecific() caused by gcc-3.1 optimizing away the call_pal
instruction when inlining thread_self().

I'm *not* an inline asm expert, but according to the GCC documentation:
"You may not write a clobber description in a way that overlaps
 with an input or output operand."

I just deleted the clobber description since $0 is an output register
and it seems to work as expected.  Any experts care to comment?

- Glen Nakamura

Index: pt-machine.h
===================================================================
RCS file: /cvs/glibc/libc/linuxthreads/sysdeps/alpha/pt-machine.h,v
retrieving revision 1.7
diff -c -3 -p -r1.7 pt-machine.h
*** pt-machine.h	23 Jul 2001 17:52:42 -0000	1.7
--- pt-machine.h	16 May 2002 03:54:02 -0000
*************** testandset (int *spinlock)
*** 71,77 ****
  #define THREAD_SELF \
  ({									      \
    register pthread_descr __self __asm__("$0");				      \
!   __asm__ ("call_pal %1" : "=r"(__self) : "i"(PAL_rduniq) : "$0");	      \
    __self;								      \
  })
  
--- 71,77 ----
  #define THREAD_SELF \
  ({									      \
    register pthread_descr __self __asm__("$0");				      \
!   __asm__ ("call_pal %1" : "=r"(__self) : "i"(PAL_rduniq));		      \
    __self;								      \
  })