libunwind: fix compile

package/libunwind/patches/patch-Makefile_in

@@ -1,5 +1,5 @@
 --- libunwind-1.2.orig/Makefile.in	2017-01-13 17:00:58.000000000 +0100
-+++ libunwind-1.2/Makefile.in	2017-04-17 16:57:53.104266427 +0200
++++ libunwind-1.2/Makefile.in	2017-04-17 19:28:43.772508581 +0200
 @@ -124,7 +124,7 @@ AM_RECURSIVE_TARGETS = $(RECURSIVE_TARGE
  	distdir dist dist-all distcheck
  ETAGS = etags

package/libunwind/patches/patch-src_x86_Gos-linux_c

@@ -1,14 +1,31 @@
 --- libunwind-1.2.orig/src/x86/Gos-linux.c	2016-11-18 04:28:29.000000000 +0100
-+++ libunwind-1.2/src/x86/Gos-linux.c	2017-04-17 16:59:08.339188080 +0200
-@@ -290,19 +290,8 @@ x86_local_resume (unw_addr_space_t as, u
-      because the frame-chain still would let us do a backtrace at
-      least.  */
-   dwarf_make_proc_info (&c->dwarf);
++++ libunwind-1.2/src/x86/Gos-linux.c	2017-04-17 18:57:50.832552016 +0200
+@@ -26,6 +26,8 @@ WITH THE SOFTWARE OR THE USE OR OTHER DE
+ #include "unwind_i.h"
+ #include "offsets.h"
+ 
++#include <sys/syscall.h>
++
+ PROTECTED int
+ unw_is_signal_frame (unw_cursor_t *cursor)
+ {
+@@ -283,26 +285,16 @@ HIDDEN int
+ x86_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
+ {
+   struct cursor *c = (struct cursor *) cursor;
+-  ucontext_t *uc = c->uc;
+-
+-  /* Ensure c->pi is up-to-date.  On x86, it's relatively common to be
+-     missing DWARF unwind info.  We don't want to fail in that case,
+-     because the frame-chain still would let us do a backtrace at
+-     least.  */
+-  dwarf_make_proc_info (&c->dwarf);
 -
 -  if (unlikely (c->sigcontext_format != X86_SCF_NONE))
 -    {
 -      struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
--
++  struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
+ 
 -      Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc);
 -      sigreturn (sc);
 -    }
@@ -17,8 +34,14 @@
 -      Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
 -      setcontext (uc);
 -    }
-+  Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
-+  setcontext (uc);
++  Debug (8, "resuming at ip=%llx via sigreturn(%p)\n",
++             (unsigned long long) c->dwarf.ip, sc);
++  __asm__ __volatile__ (
++			"int $0x80"
++        		: "=r" (sc)
++		        : "0"(SYS_rt_sigreturn)
++		        : "memory"
++  );
    return -UNW_EINVAL;
  }
  #endif

package/libunwind/patches/patch-tests_test-coredump-unwind_c

@@ -0,0 +1,21 @@
+--- libunwind-1.2.orig/tests/test-coredump-unwind.c	2017-01-13 16:58:24.000000000 +0100
++++ libunwind-1.2/tests/test-coredump-unwind.c	2017-04-17 18:52:13.963470134 +0200
+@@ -57,7 +57,9 @@
+ #include <grp.h>
+ 
+ /* For SIGSEGV handler code */
++#ifndef __UCLIBC__
+ #include <execinfo.h>
++#endif
+ #include <sys/ucontext.h>
+ 
+ #include <libunwind-coredump.h>
+@@ -242,7 +244,7 @@ void handle_sigsegv(int sig, siginfo_t *
+     void *array[50];
+     int size;
+     size = backtrace(array, 50);
+-#ifdef __linux__
++#if defined __linux__ && !defined __UCLIBC__
+     backtrace_symbols_fd(array, size, 2);
+ #endif
+   }