Fix weak/strong attribute of __errno_location and it's __GI alias

A simple statically linked hello world program was segfaulting for ARC
in linuxthreads.old configuration (although the root casue applies
cross-arch for NPTL as well as linuxthreads.old as described)

The crash was due to branch to NULL in _stdio_init

  0001026c <_stdio_init>:
     1026c:    push_s     blink
     1026e:    st.a       r13,[sp,-8]
     10272:    bl.d       0  --> supposed call to __errno_location

The call was NOT getting patched to libc internal only alias
__GI___errno_location, because it was weak while it's exported cousin,
__errno_location was strong/normal.

  arc-linux-uclibc-nm libc/misc/internals/__errno_location.os

  00000000 W __GI___errno_location
  00000000 T __errno_location

This is exactly opposite to what is expected.

Quoting Peter S. Mazinger, commit 87936cd013041 "errno and *_init cleanup"

 | The rule adopted:
 | for enabled threads we make in libc the __GI_x() variants strong, x() weak
 | and (should) provide another strong x() in libpthread.
 | If threads are disabled, even the __GI_x() variants are weak.

With the fix, we see the right settings as below

  00000000 T __GI___errno_location
  00000000 W __errno_location

Note that problem won't show up in a static busybox build as it references
errno and that seems to elide the issue.

I can confirm the same/more issues with latest ARM buildroot builds w/o
my fix.

(1). linuxthreads.old (broken just like ARC)

  arm-linux-nm uclibc-snapshot/libc/misc/internals/__errno_location.os

  00000000 W __GI___errno_location
  00000000 T __errno_location

  But presumably the issue there is NOT catestrophic because ARM linker is
  likely smarter and patches a NOP instead of NULL branch.

  00008388 <_stdio_init>:
      8388:	e92d4038 	push	{r3, r4, r5, lr}
      838c:	e320f000 	nop	{0}

(2) NPTL build (exported version is not weak)

  00000000 T __GI___errno_location
  00000000 T __errno_location

  This causes a static link with libpthread and test program
  referencing errno to fail to link.

  #include <errno.h>
  int main(void)
  {
      printf("%d\n", errno);
  }

  arm-linux-gcc -static -pthread -o tst tst.o

  arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libc.a(__errno_location.os):
  In function `__errno_location':  __errno_location.c:(.text+0x0):
                           multiple definition of `__errno_location'
  arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libpthread.a
            (errno_location.os):errno_location.c:(.text+0x0): first defined here

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
pull kconfig from linux-3.11

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
libc/metag: add __kernel_long_t and __kernel_ulong_t

Add __kernel_long_t and __kernel_ulong_t types for Meta. The rest of
the architectures have been fixed in:

6a76edddaa62ff06f178143b582167734cb55c18
"libc/sysdeps: add __kernel_long and __kernel_ulong"

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
add posix_fadvise() for arm

arm call to posix_fadvise simply calls posix_fadvise64

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
ldso: fix unused variable warning

This fixes the following warning when SUPPORT_LD_DEBUG_EARLY is not enabled:

ldso/ldso/ldso.c: In function '_dl_get_ready_to_run':
ldso/ldso/ldso.c:754:16: warning: unused variable 'tmp' [-Wunused-variable]

This was introduced with commit 94cc6edb (ldso: Rework global scope handling
and symbol lookup mechanism).

Cc: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
misc: fix nm 'No such file' error

Reset CSRC-y to prevent pollution from libc/misc/glob/Makefile.in, and fix the
following error messages when UCLIBC_HAS_OBSTACK is disabled:

nm: 'libc/misc/gnu/glob-susv3.os': No such file
nm: 'libc/misc/gnu/glob64-susv3.os': No such file

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
libdl: fix unused variable warning

The following warning introduced with commit 231e4a9b4 (libdl: fix dlopen
implementation from statically linked application):

ldso/libdl/libdl.c: In function 'do_dlopen':
ldso/libdl/libdl.c:311:23: warning: unused variable 'ls' [-Wunused-variable]

Cc: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
test: inet: fix build when res_close support is disabled

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
ldso: remove duplicate function declarations

Commit e3dec33ba (powerpc: Add TLS and NPTL support) introduced a duplicate of
_dl_add_to_slotinfo and _dl_initial_error_catch_tsd declarations.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
test: tls: fix build with newer binutils

Fix the following build failures:

ld: tst-tls10.o: undefined reference to symbol 'f2a'
ld: tst-tls12.o: undefined reference to symbol 'a1'

binutils ld defaults to --no-copy-dt-needed-entries since version 2.22. Add
library dependencies explicitly.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
prctl: fix system call wrapper

The argument names used in the prctl wrapper collide with the internal
variable names in syscall wrapper macros on some architecture. This
currently breaks xtensa. grep for '\b_a[0-9]' indicates that metag and
microblaze might also be affected.

Prefix argument names with '_prctl' to avoid collision.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
time.c: make ll_tzname* static again

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
buildsys: rm PT startfiles on realclean

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>