Update libbacktrace to r220112 (from GCC SVN)

27 files changed, 548 insertions, 184 deletions

diff --git a/src/libbacktrace/ChangeLog b/src/libbacktrace/ChangeLog
index 5ad616228e4..e385d8f741d 100644
--- a/src/libbacktrace/ChangeLog
+++ b/src/libbacktrace/ChangeLog
@@ -1,3 +1,56 @@
+2015-01-24  Matthias Klose  <doko@ubuntu.com>
+
+	* configure.ac: Move AM_ENABLE_MULTILIB before AC_PROG_CC.
+	* configure: Regenerate.
+
+2015-01-05  Jakub Jelinek  <jakub@redhat.com>
+
+	Update copyright years.
+
+2014-11-21  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR bootstrap/63784
+	* configure: Regenerated.
+
+2014-11-11  David Malcolm  <dmalcolm@redhat.com>
+
+	* ChangeLog.jit: New.
+
+2014-11-11  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
+	PR target/63610
+	* configure: Regenerate.
+
+2014-10-23  Ian Lance Taylor  <iant@google.com>
+
+	* internal.h (backtrace_atomic_load_pointer) [no atomic or sync]:
+	Fix to return void *.
+
+2014-05-08  Ian Lance Taylor  <iant@google.com>
+
+	* mmap.c (backtrace_free): If freeing a large aligned block of
+	memory, call munmap rather than holding onto it.
+	(backtrace_vector_grow): When growing a vector, double the number
+	of pages requested.  When releasing the old version of a grown
+	vector, pass the correct size to backtrace_free.
+
+2014-03-07  Ian Lance Taylor  <iant@google.com>
+
+	* sort.c (backtrace_qsort): Use middle element as pivot.
+
+2014-03-06  Ian Lance Taylor  <iant@google.com>
+
+	* sort.c: New file.
+	* stest.c: New file.
+	* internal.h (backtrace_qsort): Declare.
+	* dwarf.c (read_abbrevs): Call backtrace_qsort instead of qsort.
+	(read_line_info, read_function_entry): Likewise.
+	(read_function_info, build_dwarf_data): Likewise.
+	* elf.c (elf_initialize_syminfo): Likewise.
+	* Makefile.am (libbacktrace_la_SOURCES): Add sort.c.
+	(stest_SOURCES, stest_LDADD): Define.
+	(check_PROGRAMS): Add stest.
+
 2014-02-07  Misty De Meo  <misty@brew.sh>
 
 	PR target/58710
diff --git a/src/libbacktrace/ChangeLog.jit b/src/libbacktrace/ChangeLog.jit
new file mode 100644
index 00000000000..6b60e3b3b07
--- /dev/null
+++ b/src/libbacktrace/ChangeLog.jit
@@ -0,0 +1,14 @@
+2014-09-24  David Malcolm  <dmalcolm@redhat.com>
+
+	* ChangeLog.jit: Add copyright footer.
+
+2013-10-03  David Malcolm  <dmalcolm@redhat.com>
+
+	* configure.ac: Add --enable-host-shared.
+	* configure: Regenerate.
+
+Copyright (C) 2013-2014 Free Software Foundation, Inc.
+
+Copying and distribution of this file, with or without modification,
+are permitted in any medium without royalty provided the copyright
+notice and this notice are preserved.
diff --git a/src/libbacktrace/Makefile.am b/src/libbacktrace/Makefile.am
index 43728998292..a93b82a91b1 100644
--- a/src/libbacktrace/Makefile.am
+++ b/src/libbacktrace/Makefile.am
@@ -1,17 +1,17 @@
 # Makefile.am -- Backtrace Makefile.
-# Copyright (C) 2012-2014 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015 Free Software Foundation, Inc.
 
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 
 #     (1) Redistributions of source code must retain the above copyright
-#     notice, this list of conditions and the following disclaimer.
+#     notice, this list of conditions and the following disclaimer. 
 
 #     (2) Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in
 #     the documentation and/or other materials provided with the
-#     distribution.
+#     distribution.  
 
 #     (3) The name of the author may not be used to
 #     endorse or promote products derived from this software without
@@ -46,6 +46,7 @@ libbacktrace_la_SOURCES = \
 	internal.h \
 	posix.c \
 	print.c \
+	sort.c \
 	state.c
 
 BACKTRACE_FILES = \
@@ -93,6 +94,11 @@ btest_LDADD = libbacktrace.la
 
 check_PROGRAMS += btest
 
+stest_SOURCES = stest.c
+stest_LDADD = libbacktrace.la
+
+check_PROGRAMS += stest
+
 endif NATIVE
 
 # We can't use automake's automatic dependency tracking, because it
diff --git a/src/libbacktrace/Makefile.in b/src/libbacktrace/Makefile.in
index 93ccec2dbf9..f2821fc1526 100644
--- a/src/libbacktrace/Makefile.in
+++ b/src/libbacktrace/Makefile.in
@@ -23,12 +23,12 @@
 # met:
 
 #     (1) Redistributions of source code must retain the above copyright
-#     notice, this list of conditions and the following disclaimer.
+#     notice, this list of conditions and the following disclaimer. 
 
 #     (2) Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in
 #     the documentation and/or other materials provided with the
-#     distribution.
+#     distribution.  
 
 #     (3) The name of the author may not be used to
 #     endorse or promote products derived from this software without
@@ -67,7 +67,7 @@ build_triplet = @build@
 host_triplet = @host@
 target_triplet = @target@
 check_PROGRAMS = $(am__EXEEXT_1)
-@NATIVE_TRUE@am__append_1 = btest
+@NATIVE_TRUE@am__append_1 = btest stest
 subdir = .
 DIST_COMMON = README ChangeLog $(srcdir)/Makefile.in \
 	$(srcdir)/Makefile.am $(top_srcdir)/configure \
@@ -94,15 +94,18 @@ CONFIG_CLEAN_VPATH_FILES =
 LTLIBRARIES = $(noinst_LTLIBRARIES)
 am__DEPENDENCIES_1 =
 am_libbacktrace_la_OBJECTS = atomic.lo dwarf.lo fileline.lo posix.lo \
-	print.lo state.lo
+	print.lo sort.lo state.lo
 libbacktrace_la_OBJECTS = $(am_libbacktrace_la_OBJECTS)
-@NATIVE_TRUE@am__EXEEXT_1 = btest$(EXEEXT)
+@NATIVE_TRUE@am__EXEEXT_1 = btest$(EXEEXT) stest$(EXEEXT)
 @NATIVE_TRUE@am_btest_OBJECTS = btest-btest.$(OBJEXT)
 btest_OBJECTS = $(am_btest_OBJECTS)
 @NATIVE_TRUE@btest_DEPENDENCIES = libbacktrace.la
 btest_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 	--mode=link $(CCLD) $(btest_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
 	$(LDFLAGS) -o $@
+@NATIVE_TRUE@am_stest_OBJECTS = stest.$(OBJEXT)
+stest_OBJECTS = $(am_stest_OBJECTS)
+@NATIVE_TRUE@stest_DEPENDENCIES = libbacktrace.la
 DEFAULT_INCLUDES = -I.@am__isrc@
 depcomp =
 am__depfiles_maybe =
@@ -116,11 +119,11 @@ LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 	--mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
 	$(LDFLAGS) -o $@
 SOURCES = $(libbacktrace_la_SOURCES) $(EXTRA_libbacktrace_la_SOURCES) \
-	$(btest_SOURCES)
-MULTISRCTOP =
-MULTIBUILDTOP =
-MULTIDIRS =
-MULTISUBDIR =
+	$(btest_SOURCES) $(stest_SOURCES)
+MULTISRCTOP = 
+MULTIBUILDTOP = 
+MULTIDIRS = 
+MULTISUBDIR = 
 MULTIDO = true
 MULTICLEAN = true
 ETAGS = etags
@@ -264,6 +267,7 @@ libbacktrace_la_SOURCES = \
 	internal.h \
 	posix.c \
 	print.c \
+	sort.c \
 	state.c
 
 BACKTRACE_FILES = \
@@ -300,6 +304,8 @@ TESTS = $(check_PROGRAMS)
 @NATIVE_TRUE@btest_SOURCES = btest.c
 @NATIVE_TRUE@btest_CFLAGS = $(AM_CFLAGS) -g -O
 @NATIVE_TRUE@btest_LDADD = libbacktrace.la
+@NATIVE_TRUE@stest_SOURCES = stest.c
+@NATIVE_TRUE@stest_LDADD = libbacktrace.la
 
 # We can't use automake's automatic dependency tracking, because it
 # breaks when using bootstrap-lean.  Automatic dependency tracking
@@ -362,7 +368,7 @@ config.h: stamp-h1
 stamp-h1: $(srcdir)/config.h.in $(top_builddir)/config.status
 	@rm -f stamp-h1
 	cd $(top_builddir) && $(SHELL) ./config.status config.h
-$(srcdir)/config.h.in: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+$(srcdir)/config.h.in: @MAINTAINER_MODE_TRUE@ $(am__configure_deps) 
 	($(am__cd) $(top_srcdir) && $(AUTOHEADER))
 	rm -f stamp-h1
 	touch $@
@@ -380,7 +386,7 @@ clean-noinstLTLIBRARIES:
 	  echo "rm -f \"$${dir}/so_locations\""; \
 	  rm -f "$${dir}/so_locations"; \
 	done
-libbacktrace.la: $(libbacktrace_la_OBJECTS) $(libbacktrace_la_DEPENDENCIES)
+libbacktrace.la: $(libbacktrace_la_OBJECTS) $(libbacktrace_la_DEPENDENCIES) 
 	$(LINK)  $(libbacktrace_la_OBJECTS) $(libbacktrace_la_LIBADD) $(LIBS)
 
 clean-checkPROGRAMS:
@@ -391,9 +397,12 @@ clean-checkPROGRAMS:
 	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
 	echo " rm -f" $$list; \
 	rm -f $$list
-btest$(EXEEXT): $(btest_OBJECTS) $(btest_DEPENDENCIES)
+btest$(EXEEXT): $(btest_OBJECTS) $(btest_DEPENDENCIES) 
 	@rm -f btest$(EXEEXT)
 	$(btest_LINK) $(btest_OBJECTS) $(btest_LDADD) $(LIBS)
+stest$(EXEEXT): $(stest_OBJECTS) $(stest_DEPENDENCIES) 
+	@rm -f stest$(EXEEXT)
+	$(LINK) $(stest_OBJECTS) $(stest_LDADD) $(LIBS)
 
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
diff --git a/src/libbacktrace/alloc.c b/src/libbacktrace/alloc.c
index 4aa85d050fd..143ef68ca51 100644
--- a/src/libbacktrace/alloc.c
+++ b/src/libbacktrace/alloc.c
@@ -1,5 +1,5 @@
 /* alloc.c -- Memory allocation without mmap.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/atomic.c b/src/libbacktrace/atomic.c
index b31fa64c798..fdd2490da7c 100644
--- a/src/libbacktrace/atomic.c
+++ b/src/libbacktrace/atomic.c
@@ -1,5 +1,5 @@
 /* atomic.c -- Support for atomic functions if not present.
-   Copyright (C) 2013-2014 Free Software Foundation, Inc.
+   Copyright (C) 2013-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/backtrace-supported.h.in b/src/libbacktrace/backtrace-supported.h.in
index 28488167c4e..5115ce1e615 100644
--- a/src/libbacktrace/backtrace-supported.h.in
+++ b/src/libbacktrace/backtrace-supported.h.in
@@ -1,5 +1,5 @@
 /* backtrace-supported.h.in -- Whether stack backtrace is supported.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/backtrace.c b/src/libbacktrace/backtrace.c
index 4b90357df5f..d352d27a400 100644
--- a/src/libbacktrace/backtrace.c
+++ b/src/libbacktrace/backtrace.c
@@ -1,5 +1,5 @@
 /* backtrace.c -- Entry point for stack backtrace library.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/backtrace.h b/src/libbacktrace/backtrace.h
index 3f77093f767..50dcd40751b 100644
--- a/src/libbacktrace/backtrace.h
+++ b/src/libbacktrace/backtrace.h
@@ -1,5 +1,5 @@
 /* backtrace.h -- Public header file for stack backtrace library.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/btest.c b/src/libbacktrace/btest.c
index a1818f1ef83..9424a927f2d 100644
--- a/src/libbacktrace/btest.c
+++ b/src/libbacktrace/btest.c
@@ -1,5 +1,5 @@
 /* btest.c -- Test for libbacktrace library
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
@@ -460,7 +460,7 @@ f23 (int f1line, int f2line)
 		       (unsigned int) bdata.index, j + 1);
 	      bdata.failed = 1;
 	    }
-	}
+	}      
 
       check ("test3", 0, all, f3line, "f23", &bdata.failed);
       check ("test3", 1, all, f2line, "f22", &bdata.failed);
diff --git a/src/libbacktrace/configure b/src/libbacktrace/configure
index d5e08d93f6c..53c09a0f071 100755
--- a/src/libbacktrace/configure
+++ b/src/libbacktrace/configure
@@ -614,7 +614,6 @@ PIC_FLAG
 WARN_FLAGS
 EXTRA_FLAGS
 BACKTRACE_FILE
-multi_basedir
 OTOOL64
 OTOOL
 LIPO
@@ -680,6 +679,7 @@ build_os
 build_vendor
 build_cpu
 build
+multi_basedir
 target_alias
 host_alias
 build_alias
@@ -721,6 +721,7 @@ SHELL'
 ac_subst_files=''
 ac_user_opts='
 enable_option_checking
+enable_multilib
 enable_maintainer_mode
 with_target_subdir
 enable_shared
@@ -729,7 +730,6 @@ with_pic
 enable_fast_install
 with_gnu_ld
 enable_libtool_lock
-enable_multilib
 with_system_libunwind
 enable_host_shared
 '
@@ -1362,6 +1362,7 @@ Optional Features:
   --disable-option-checking  ignore unrecognized --enable/--with options
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
+  --enable-multilib       build many library versions (default)
   --enable-maintainer-mode  enable make rules and dependencies not useful
 			  (and sometimes confusing) to the casual installer
   --enable-shared[=PKGS]  build shared libraries [default=no]
@@ -1369,7 +1370,6 @@ Optional Features:
   --enable-fast-install[=PKGS]
                           optimize for fast installation [default=yes]
   --disable-libtool-lock  avoid locking (might break parallel builds)
-  --enable-multilib       build many library versions (default)
   --enable-host-shared    build host code as shared libraries
 
 Optional Packages:
@@ -2453,6 +2453,46 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 ac_config_headers="$ac_config_headers config.h"
 
 
+if test -n "${with_target_subdir}"; then
+  # Default to --enable-multilib
+# Check whether --enable-multilib was given.
+if test "${enable_multilib+set}" = set; then :
+  enableval=$enable_multilib; case "$enableval" in
+  yes) multilib=yes ;;
+  no)  multilib=no ;;
+  *)   as_fn_error "bad value $enableval for multilib option" "$LINENO" 5 ;;
+ esac
+else
+  multilib=yes
+fi
+
+
+# We may get other options which we leave undocumented:
+# --with-target-subdir, --with-multisrctop, --with-multisubdir
+# See config-ml.in if you want the gory details.
+
+if test "$srcdir" = "."; then
+  if test "$with_target_subdir" != "."; then
+    multi_basedir="$srcdir/$with_multisrctop../.."
+  else
+    multi_basedir="$srcdir/$with_multisrctop.."
+  fi
+else
+  multi_basedir="$srcdir/.."
+fi
+
+
+# Even if the default multilib is not a cross compilation,
+# it may be that some of the other multilibs are.
+if test $cross_compiling = no && test $multilib = yes \
+   && test "x${with_multisubdir}" != x ; then
+   cross_compiling=maybe
+fi
+
+ac_config_commands="$ac_config_commands default-1"
+
+fi
+
 ac_aux_dir=
 for ac_dir in "$srcdir" "$srcdir/.." "$srcdir/../.."; do
   for ac_t in install-sh install.sh shtool; do
@@ -5650,7 +5690,7 @@ else
     lt_cv_sys_max_cmd_len=8192;
     ;;
 
-  netbsd* | freebsd* | openbsd* | darwin* | dragonfly* | bitrig*)
+  netbsd* | freebsd* | openbsd* | darwin* | dragonfly*)
     # This has been around since 386BSD, at least.  Likely further.
     if test -x /sbin/sysctl; then
       lt_cv_sys_max_cmd_len=`/sbin/sysctl -n kern.argmax`
@@ -7576,7 +7616,7 @@ $as_echo "$lt_cv_ld_force_load" >&6; }
       case ${MACOSX_DEPLOYMENT_TARGET-10.0},$host in
 	10.0,*86*-darwin8*|10.0,*-darwin[91]*)
 	  _lt_dar_allow_undefined='${wl}-undefined ${wl}dynamic_lookup' ;;
-	10.[012]*)
+	10.[012][,.]*)
 	  _lt_dar_allow_undefined='${wl}-flat_namespace ${wl}-undefined ${wl}suppress' ;;
 	10.*)
 	  _lt_dar_allow_undefined='${wl}-undefined ${wl}dynamic_lookup' ;;
@@ -8879,7 +8919,7 @@ _LT_EOF
       if $LD --help 2>&1 | $EGREP ': supported targets:.* elf' > /dev/null \
 	 && test "$tmp_diet" = no
       then
-	tmp_addflag=
+	tmp_addflag=' $pic_flag'
 	tmp_sharedflag='-shared'
 	case $cc_basename,$host_cpu in
         pgcc*)				# Portland Group C compiler
@@ -9332,7 +9372,7 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       ;;
 
     # FreeBSD 3 and greater uses gcc -shared to do shared libraries.
-    freebsd* | dragonfly* | bitrig* | openbsd*)
+    freebsd* | dragonfly*)
       archive_cmds='$CC -shared -o $lib $libobjs $deplibs $compiler_flags'
       hardcode_libdir_flag_spec='-R$libdir'
       hardcode_direct=yes
@@ -11089,7 +11129,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11092 "configure"
+#line 11132 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11195,7 +11235,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11198 "configure"
+#line 11238 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11439,43 +11479,6 @@ backtrace_supported=yes
 if test -n "${with_target_subdir}"; then
   # We are compiling a GCC library.  We can assume that the unwind
   # library exists.
-  # Default to --enable-multilib
-# Check whether --enable-multilib was given.
-if test "${enable_multilib+set}" = set; then :
-  enableval=$enable_multilib; case "$enableval" in
-  yes) multilib=yes ;;
-  no)  multilib=no ;;
-  *)   as_fn_error "bad value $enableval for multilib option" "$LINENO" 5 ;;
- esac
-else
-  multilib=yes
-fi
-
-
-# We may get other options which we leave undocumented:
-# --with-target-subdir, --with-multisrctop, --with-multisubdir
-# See config-ml.in if you want the gory details.
-
-if test "$srcdir" = "."; then
-  if test "$with_target_subdir" != "."; then
-    multi_basedir="$srcdir/$with_multisrctop../.."
-  else
-    multi_basedir="$srcdir/$with_multisrctop.."
-  fi
-else
-  multi_basedir="$srcdir/.."
-fi
-
-
-# Even if the default multilib is not a cross compilation,
-# it may be that some of the other multilibs are.
-if test $cross_compiling = no && test $multilib = yes \
-   && test "x${with_multisubdir}" != x ; then
-   cross_compiling=maybe
-fi
-
-ac_config_commands="$ac_config_commands default-1"
-
   BACKTRACE_FILE="backtrace.lo simple.lo"
 else
   ac_fn_c_check_header_mongrel "$LINENO" "unwind.h" "ac_cv_header_unwind_h" "$ac_includes_default"
@@ -13174,6 +13177,20 @@ cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 # INIT-COMMANDS
 #
 
+srcdir="$srcdir"
+host="$host"
+target="$target"
+with_multisubdir="$with_multisubdir"
+with_multisrctop="$with_multisrctop"
+with_target_subdir="$with_target_subdir"
+ac_configure_args="${multilib_arg} ${ac_configure_args}"
+multi_basedir="$multi_basedir"
+CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
+CC="$CC"
+CXX="$CXX"
+GFORTRAN="$GFORTRAN"
+GCJ="$GCJ"
+
 
 # The HP-UX ksh and POSIX shell print the target directory to stdout
 # if CDPATH is set.
@@ -13434,20 +13451,6 @@ fi
 
 
 
-srcdir="$srcdir"
-host="$host"
-target="$target"
-with_multisubdir="$with_multisubdir"
-with_multisrctop="$with_multisrctop"
-with_target_subdir="$with_target_subdir"
-ac_configure_args="${multilib_arg} ${ac_configure_args}"
-multi_basedir="$multi_basedir"
-CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
-CC="$CC"
-CXX="$CXX"
-GFORTRAN="$GFORTRAN"
-GCJ="$GCJ"
-
 GCC="$GCC"
 CC="$CC"
 acx_cv_header_stdint="$acx_cv_header_stdint"
@@ -13480,8 +13483,8 @@ for ac_config_target in $ac_config_targets
 do
   case $ac_config_target in
     "config.h") CONFIG_HEADERS="$CONFIG_HEADERS config.h" ;;
-    "libtool") CONFIG_COMMANDS="$CONFIG_COMMANDS libtool" ;;
     "default-1") CONFIG_COMMANDS="$CONFIG_COMMANDS default-1" ;;
+    "libtool") CONFIG_COMMANDS="$CONFIG_COMMANDS libtool" ;;
     "gstdint.h") CONFIG_COMMANDS="$CONFIG_COMMANDS gstdint.h" ;;
     "Makefile") CONFIG_FILES="$CONFIG_FILES Makefile" ;;
     "backtrace-supported.h") CONFIG_FILES="$CONFIG_FILES backtrace-supported.h" ;;
@@ -14070,6 +14073,14 @@ $as_echo "$as_me: executing $ac_file commands" >&6;}
 
 
   case $ac_file$ac_mode in
+    "default-1":C)
+# Only add multilib support code if we just rebuilt the top-level
+# Makefile.
+case " $CONFIG_FILES " in
+ *" Makefile "*)
+   ac_file=Makefile . ${multi_basedir}/config-ml.in
+   ;;
+esac ;;
     "libtool":C)
 
     # See if we are running on zsh, and set the options which allow our
@@ -14709,14 +14720,6 @@ _LT_EOF
   chmod +x "$ofile"
 
  ;;
-    "default-1":C)
-# Only add multilib support code if we just rebuilt the top-level
-# Makefile.
-case " $CONFIG_FILES " in
- *" Makefile "*)
-   ac_file=Makefile . ${multi_basedir}/config-ml.in
-   ;;
-esac ;;
     "gstdint.h":C)
 if test "$GCC" = yes; then
   echo "/* generated for " `$CC --version | sed 1q` "*/" > tmp-stdint.h
@@ -15153,3 +15156,4 @@ if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5
 $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
 fi
+
diff --git a/src/libbacktrace/configure.ac b/src/libbacktrace/configure.ac
index d661c7b2560..9c37dac43ae 100644
--- a/src/libbacktrace/configure.ac
+++ b/src/libbacktrace/configure.ac
@@ -1,18 +1,18 @@
 # configure.ac -- Backtrace configure script.
-# Copyright (C) 2012-2014 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015 Free Software Foundation, Inc.
 
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 
 #     (1) Redistributions of source code must retain the above copyright
-#     notice, this list of conditions and the following disclaimer.
+#     notice, this list of conditions and the following disclaimer. 
 
 #     (2) Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in
 #     the documentation and/or other materials provided with the
-#     distribution.
-
+#     distribution.  
+    
 #     (3) The name of the author may not be used to
 #     endorse or promote products derived from this software without
 #     specific prior written permission.
@@ -34,6 +34,10 @@ AC_INIT(package-unused, version-unused,, libbacktrace)
 AC_CONFIG_SRCDIR(backtrace.h)
 AC_CONFIG_HEADER(config.h)
 
+if test -n "${with_target_subdir}"; then
+  AM_ENABLE_MULTILIB(, ..)
+fi
+
 AC_CANONICAL_SYSTEM
 target_alias=${target_alias-$host_alias}
 
@@ -83,7 +87,6 @@ backtrace_supported=yes
 if test -n "${with_target_subdir}"; then
   # We are compiling a GCC library.  We can assume that the unwind
   # library exists.
-  AM_ENABLE_MULTILIB(, ..)
   BACKTRACE_FILE="backtrace.lo simple.lo"
 else
   AC_CHECK_HEADER([unwind.h],
diff --git a/src/libbacktrace/dwarf.c b/src/libbacktrace/dwarf.c
index 5ecae711792..919b568c786 100644
--- a/src/libbacktrace/dwarf.c
+++ b/src/libbacktrace/dwarf.c
@@ -1,5 +1,5 @@
 /* dwarf.c -- Get file/line information from DWARF for backtraces.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
@@ -1134,8 +1134,8 @@ read_abbrevs (struct backtrace_state *state, uint64_t abbrev_offset,
       ++num_abbrevs;
     }
 
-  qsort (abbrevs->abbrevs, abbrevs->num_abbrevs, sizeof (struct abbrev),
-	 abbrev_compare);
+  backtrace_qsort (abbrevs->abbrevs, abbrevs->num_abbrevs,
+		   sizeof (struct abbrev), abbrev_compare);
 
   return 1;
 
@@ -1241,7 +1241,7 @@ add_unit_ranges (struct backtrace_state *state, uintptr_t base_address,
 
 static int
 find_address_ranges (struct backtrace_state *state, uintptr_t base_address,
-		     struct dwarf_buf *unit_buf,
+		     struct dwarf_buf *unit_buf, 
 		     const unsigned char *dwarf_str, size_t dwarf_str_size,
 		     const unsigned char *dwarf_ranges,
 		     size_t dwarf_ranges_size,
@@ -1599,7 +1599,7 @@ read_line_header (struct backtrace_state *state, struct unit *u,
 
   if (!advance (line_buf, hdrlen))
     return 0;
-
+  
   hdr->min_insn_len = read_byte (&hdr_buf);
   if (hdr->version < 4)
     hdr->max_ops_per_insn = 1;
@@ -1608,7 +1608,7 @@ read_line_header (struct backtrace_state *state, struct unit *u,
 
   /* We don't care about default_is_stmt.  */
   read_byte (&hdr_buf);
-
+  
   hdr->line_base = read_sbyte (&hdr_buf);
   hdr->line_range = read_byte (&hdr_buf);
 
@@ -2016,7 +2016,7 @@ read_line_info (struct backtrace_state *state, struct dwarf_data *ddata,
     goto fail;
 
   ln = (struct line *) vec.vec.base;
-  qsort (ln, vec.count, sizeof (struct line), line_compare);
+  backtrace_qsort (ln, vec.count, sizeof (struct line), line_compare);
 
   *lines = ln;
   *lines_count = vec.count;
@@ -2476,9 +2476,9 @@ read_function_entry (struct backtrace_state *state, struct dwarf_data *ddata,
 		    return 0;
 
 		  faddrs = (struct function_addrs *) fvec.vec.base;
-		  qsort (faddrs, fvec.count,
-			 sizeof (struct function_addrs),
-			 function_addrs_compare);
+		  backtrace_qsort (faddrs, fvec.count,
+				   sizeof (struct function_addrs),
+				   function_addrs_compare);
 
 		  function->function_addrs = faddrs;
 		  function->function_addrs_count = fvec.count;
@@ -2555,8 +2555,8 @@ read_function_info (struct backtrace_state *state, struct dwarf_data *ddata,
       fvec->count = 0;
     }
 
-  qsort (addrs, addrs_count, sizeof (struct function_addrs),
-	 function_addrs_compare);
+  backtrace_qsort (addrs, addrs_count, sizeof (struct function_addrs),
+		   function_addrs_compare);
 
   *ret_addrs = addrs;
   *ret_addrs_count = addrs_count;
@@ -2923,7 +2923,8 @@ build_dwarf_data (struct backtrace_state *state,
     return NULL;
   addrs = (struct unit_addrs *) addrs_vec.vec.base;
   addrs_count = addrs_vec.count;
-  qsort (addrs, addrs_count, sizeof (struct unit_addrs), unit_addrs_compare);
+  backtrace_qsort (addrs, addrs_count, sizeof (struct unit_addrs),
+		   unit_addrs_compare);
 
   fdata = ((struct dwarf_data *)
 	   backtrace_alloc (state, sizeof (struct dwarf_data),
diff --git a/src/libbacktrace/elf.c b/src/libbacktrace/elf.c
index 5fc74add05c..3f14b11a43c 100644
--- a/src/libbacktrace/elf.c
+++ b/src/libbacktrace/elf.c
@@ -1,5 +1,5 @@
 /* elf.c -- Get debug data from an ELF file for backtraces.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
@@ -407,8 +407,8 @@ elf_initialize_syminfo (struct backtrace_state *state,
       ++j;
     }
 
-  qsort (elf_symbols, elf_symbol_count, sizeof (struct elf_symbol),
-	 elf_symbol_compare);
+  backtrace_qsort (elf_symbols, elf_symbol_count, sizeof (struct elf_symbol),
+		   elf_symbol_compare);
 
   sdata->next = NULL;
   sdata->symbols = elf_symbols;
diff --git a/src/libbacktrace/fileline.c b/src/libbacktrace/fileline.c
index f45cccff713..0acad0603ee 100644
--- a/src/libbacktrace/fileline.c
+++ b/src/libbacktrace/fileline.c
@@ -1,5 +1,5 @@
 /* fileline.c -- Get file and line number information in a backtrace.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/internal.h b/src/libbacktrace/internal.h
index a13c775b628..30f99ca127f 100644
--- a/src/libbacktrace/internal.h
+++ b/src/libbacktrace/internal.h
@@ -1,5 +1,5 @@
 /* internal.h -- Internal header file for stack backtrace library.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
@@ -99,7 +99,7 @@ extern void backtrace_atomic_store_int (int *, int);
 /* We have neither the sync nor the atomic functions.  These will
    never be called.  */
 
-#define backtrace_atomic_load_pointer(p) (abort(), 0)
+#define backtrace_atomic_load_pointer(p) (abort(), (void *) NULL)
 #define backtrace_atomic_load_int(p) (abort(), 0)
 #define backtrace_atomic_store_pointer(p, v) abort()
 #define backtrace_atomic_store_size_t(p, v) abort()
@@ -196,6 +196,11 @@ extern int backtrace_close (int descriptor,
 			    backtrace_error_callback error_callback,
 			    void *data);
 
+/* Sort without using memory.  */
+
+extern void backtrace_qsort (void *base, size_t count, size_t size,
+			     int (*compar) (const void *, const void *));
+
 /* Allocate memory.  This is like malloc.  */
 
 extern void *backtrace_alloc (struct backtrace_state *state, size_t size,
diff --git a/src/libbacktrace/mmap.c b/src/libbacktrace/mmap.c
index 1c691b02e7c..1ecf1311911 100644
--- a/src/libbacktrace/mmap.c
+++ b/src/libbacktrace/mmap.c
@@ -1,5 +1,5 @@
 /* mmap.c -- Memory allocation with mmap.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
@@ -164,6 +164,26 @@ backtrace_free (struct backtrace_state *state, void *addr, size_t size,
 {
   int locked;
 
+  /* If we are freeing a large aligned block, just release it back to
+     the system.  This case arises when growing a vector for a large
+     binary with lots of debug info.  Calling munmap here may cause us
+     to call mmap again if there is also a large shared library; we
+     just live with that.  */
+  if (size >= 16 * 4096)
+    {
+      size_t pagesize;
+
+      pagesize = getpagesize ();
+      if (((uintptr_t) addr & (pagesize - 1)) == 0
+	  && (size & (pagesize - 1)) == 0)
+	{
+	  /* If munmap fails for some reason, just add the block to
+	     the freelist.  */
+	  if (munmap (addr, size) == 0)
+	    return;
+	}
+    }
+
   /* If we can acquire the lock, add the new space to the free list.
      If we can't acquire the lock, just leak the memory.
      __sync_lock_test_and_set returns the old state of the lock, so we
@@ -209,14 +229,18 @@ backtrace_vector_grow (struct backtrace_state *state,size_t size,
 	    alc = pagesize;
 	}
       else
-	alc = (alc + pagesize - 1) & ~ (pagesize - 1);
+	{
+	  alc *= 2;
+	  alc = (alc + pagesize - 1) & ~ (pagesize - 1);
+	}
       base = backtrace_alloc (state, alc, error_callback, data);
       if (base == NULL)
 	return NULL;
       if (vec->base != NULL)
 	{
 	  memcpy (base, vec->base, vec->size);
-	  backtrace_free (state, vec->base, vec->alc, error_callback, data);
+	  backtrace_free (state, vec->base, vec->size + vec->alc,
+			  error_callback, data);
 	}
       vec->base = base;
       vec->alc = alc - vec->size;
diff --git a/src/libbacktrace/mmapio.c b/src/libbacktrace/mmapio.c
index 8b8f124da9a..b5a787e0aa6 100644
--- a/src/libbacktrace/mmapio.c
+++ b/src/libbacktrace/mmapio.c
@@ -1,5 +1,5 @@
 /* mmapio.c -- File views using mmap.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/nounwind.c b/src/libbacktrace/nounwind.c
index f8fdbdc85ac..f53f906b5a8 100644
--- a/src/libbacktrace/nounwind.c
+++ b/src/libbacktrace/nounwind.c
@@ -1,5 +1,5 @@
 /* backtrace.c -- Entry point for stack backtrace library.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/posix.c b/src/libbacktrace/posix.c
index 7f1c35ab970..7fa7cd0d5da 100644
--- a/src/libbacktrace/posix.c
+++ b/src/libbacktrace/posix.c
@@ -1,5 +1,5 @@
 /* posix.c -- POSIX file I/O routines for the backtrace library.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/print.c b/src/libbacktrace/print.c
index 70e347f62c2..90ecaf89eda 100644
--- a/src/libbacktrace/print.c
+++ b/src/libbacktrace/print.c
@@ -1,5 +1,5 @@
 /* print.c -- Print the current backtrace.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/read.c b/src/libbacktrace/read.c
index e373b61de2e..299f77ba7c6 100644
--- a/src/libbacktrace/read.c
+++ b/src/libbacktrace/read.c
@@ -1,5 +1,5 @@
 /* read.c -- File views without mmap.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/simple.c b/src/libbacktrace/simple.c
index dd70f831de7..39c2e902ff7 100644
--- a/src/libbacktrace/simple.c
+++ b/src/libbacktrace/simple.c
@@ -1,5 +1,5 @@
 /* simple.c -- The backtrace_simple function.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/sort.c b/src/libbacktrace/sort.c
new file mode 100644
index 00000000000..bcc765e93aa
--- /dev/null
+++ b/src/libbacktrace/sort.c
@@ -0,0 +1,108 @@
+/* sort.c -- Sort without allocating memory
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    (1) Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer. 
+
+    (2) Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.  
+    
+    (3) The name of the author may not be used to
+    endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.  */
+
+#include "config.h"
+
+#include <stddef.h>
+#include <sys/types.h>
+
+#include "backtrace.h"
+#include "internal.h"
+
+/* The GNU glibc version of qsort allocates memory, which we must not
+   do if we are invoked by a signal handler.  So provide our own
+   sort.  */
+
+static void
+swap (char *a, char *b, size_t size)
+{
+  size_t i;
+
+  for (i = 0; i < size; i++, a++, b++)
+    {
+      char t;
+
+      t = *a;
+      *a = *b;
+      *b = t;
+    }
+}
+
+void
+backtrace_qsort (void *basearg, size_t count, size_t size,
+		 int (*compar) (const void *, const void *))
+{
+  char *base = (char *) basearg;
+  size_t i;
+  size_t mid;
+
+ tail_recurse:
+  if (count < 2)
+    return;
+
+  /* The symbol table and DWARF tables, which is all we use this
+     routine for, tend to be roughly sorted.  Pick the middle element
+     in the array as our pivot point, so that we are more likely to
+     cut the array in half for each recursion step.  */
+  swap (base, base + (count / 2) * size, size);
+
+  mid = 0;
+  for (i = 1; i < count; i++)
+    {
+      if ((*compar) (base, base + i * size) > 0)
+	{
+	  ++mid;
+	  if (i != mid)
+	    swap (base + mid * size, base + i * size, size);
+	}
+    }
+
+  if (mid > 0)
+    swap (base, base + mid * size, size);
+
+  /* Recurse with the smaller array, loop with the larger one.  That
+     ensures that our maximum stack depth is log count.  */
+  if (2 * mid < count)
+    {
+      backtrace_qsort (base, mid, size, compar);
+      base += (mid + 1) * size;
+      count -= mid + 1;
+      goto tail_recurse;
+    }
+  else
+    {
+      backtrace_qsort (base + (mid + 1) * size, count - (mid + 1),
+		       size, compar);
+      count = mid;
+      goto tail_recurse;
+    }
+}
diff --git a/src/libbacktrace/state.c b/src/libbacktrace/state.c
index bef47bd1a0f..a846378e903 100644
--- a/src/libbacktrace/state.c
+++ b/src/libbacktrace/state.c
@@ -1,5 +1,5 @@
 /* state.c -- Create the backtrace state.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.
diff --git a/src/libbacktrace/stest.c b/src/libbacktrace/stest.c
new file mode 100644
index 00000000000..ec93e680e89
--- /dev/null
+++ b/src/libbacktrace/stest.c
@@ -0,0 +1,137 @@
+/* stest.c -- Test for libbacktrace internal sort function
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    (1) Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer. 
+
+    (2) Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.  
+    
+    (3) The name of the author may not be used to
+    endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.  */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "backtrace.h"
+#include "internal.h"
+
+/* Test the local qsort implementation.  */
+
+#define MAX 10
+
+struct test
+{
+  size_t count;
+  int input[MAX];
+  int output[MAX];
+};
+
+static struct test tests[] =
+  {
+    {
+      10,
+      { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 },
+      { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }
+    },
+    {
+      9,
+      { 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+      { 1, 2, 3, 4, 5, 6, 7, 8, 9 }
+    },
+    {
+      10,
+      { 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 },
+      { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 },
+    },
+    {
+      9,
+      { 9, 8, 7, 6, 5, 4, 3, 2, 1 },
+      { 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+    },
+    {
+      10,
+      { 2, 4, 6, 8, 10, 1, 3, 5, 7, 9 },
+      { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 },
+    },
+    {
+      5,
+      { 4, 5, 3, 1, 2 },
+      { 1, 2, 3, 4, 5 },
+    },
+    {
+      5,
+      { 1, 1, 1, 1, 1 },
+      { 1, 1, 1, 1, 1 },
+    },
+    {
+      5,
+      { 1, 1, 2, 1, 1 },
+      { 1, 1, 1, 1, 2 },
+    },
+    {
+      5,
+      { 2, 1, 1, 1, 1 },
+      { 1, 1, 1, 1, 2 },
+    },
+  };
+
+static int
+compare (const void *a, const void *b)
+{
+  const int *ai = (const int *) a;
+  const int *bi = (const int *) b;
+
+  return *ai - *bi;
+}
+
+int
+main (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
+{
+  int failures;
+  size_t i;
+  int a[MAX];
+
+  failures = 0;
+  for (i = 0; i < sizeof tests / sizeof tests[0]; i++)
+    {
+      memcpy (a, tests[i].input, tests[i].count * sizeof (int));
+      backtrace_qsort (a, tests[i].count, sizeof (int), compare);
+      if (memcmp (a, tests[i].output, tests[i].count * sizeof (int)) != 0)
+	{
+	  size_t j;
+
+	  fprintf (stderr, "test %d failed:", (int) i);
+	  for (j = 0; j < tests[i].count; j++)
+	    fprintf (stderr, " %d", a[j]);
+	  fprintf (stderr, "\n");
+	  ++failures;
+	}
+    }
+
+  exit (failures > 0 ? EXIT_FAILURE : EXIT_SUCCESS);
+}
diff --git a/src/libbacktrace/unknown.c b/src/libbacktrace/unknown.c
index e5e8421b3a9..e89cba96f7d 100644
--- a/src/libbacktrace/unknown.c
+++ b/src/libbacktrace/unknown.c
@@ -1,5 +1,5 @@
 /* unknown.c -- used when backtrace configury does not know file format.
-   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+   Copyright (C) 2012-2015 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Google.
 
 Redistribution and use in source and binary forms, with or without
@@ -7,13 +7,13 @@ modification, are permitted provided that the following conditions are
 met:
 
     (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+    notice, this list of conditions and the following disclaimer. 
 
     (2) Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
-    distribution.
-
+    distribution.  
+    
     (3) The name of the author may not be used to
     endorse or promote products derived from this software without
     specific prior written permission.