Update.

1998-06-08 18:57  Ulrich Drepper  <drepper@cygnus.com>

	* Makeconfig (subdirs): Add debug.
	* configure.in: Use sysdeps/generic/elf subdir if ELF platform.
	* libc.map: Add __backtrace, __backtrace_symbols, backtrace and
	backtrace_symbols.
	* sysdeps/generic/backtrace.c: New file.
	* sysdeps/generic/backtracesyms.c: New file.
	* sysdeps/generic/elf/backtracesyms.c: New file.
	* sysdeps/i386/backtrace.c: New file.
	* debug/Makefile: New file.
	* debug/backtrace-tst.c: New file.
	* debug/execinfo.h: New file.

12 files changed, 464 insertions, 84 deletions

diff --git a/ChangeLog b/ChangeLog
index f50ad34002..1254c46d99 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+1998-06-08 18:57  Ulrich Drepper  <drepper@cygnus.com>
+
+	* Makeconfig (subdirs): Add debug.
+	* configure.in: Use sysdeps/generic/elf subdir if ELF platform.
+	* libc.map: Add __backtrace, __backtrace_symbols, backtrace and
+	backtrace_symbols.
+	* sysdeps/generic/backtrace.c: New file.
+	* sysdeps/generic/backtracesyms.c: New file.
+	* sysdeps/generic/elf/backtracesyms.c: New file.
+	* sysdeps/i386/backtrace.c: New file.
+	* debug/Makefile: New file.
+	* debug/backtrace-tst.c: New file.
+	* debug/execinfo.h: New file.
+
 1998-06-08 13:34  Ulrich Drepper  <drepper@cygnus.com>
 
 	* elf/sprof.c: Implement call graph profiling.
diff --git a/Makeconfig b/Makeconfig
index 3737e939dc..d70c4795ef 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -760,7 +760,7 @@ subdirs = csu assert ctype db2 locale intl catgets math setjmp signal stdlib \
 	  stdio-common $(stdio) malloc string wcsmbs time dirent grp pwd \
 	  posix io termios resource misc socket sysvipc gmon gnulib iconv \
 	  iconvdata wctype manual shadow md5-crypt po argp $(add-ons) nss \
-	  localedata timezone rt $(sysdep-subdirs) $(binfmt-subdir)
+	  localedata timezone rt debug $(sysdep-subdirs) $(binfmt-subdir)
 
 # The mach and hurd subdirectories have many generated header files which
 # much of the rest of the library depends on, so it is best to build them
diff --git a/configure b/configure
index 56540890ee..f4faf10d67 100755
--- a/configure
+++ b/configure
@@ -1119,7 +1119,11 @@ while test $# -gt 0; do
 done
 
 # Add the default directories.
-sysnames="$names sysdeps/generic"
+if test "$elf" = yes; then
+  sysnames="$names sysdeps/generic/elf sysdeps/generic"
+else
+  sysnames="$names sysdeps/generic"
+fi
 
 # The other names were emitted during the scan.
 echo "$ac_t""sysdeps/generic" 1>&6
@@ -1138,7 +1142,7 @@ echo "$ac_t""sysdeps/generic" 1>&6
 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
 # ./install, which can be erroneously created by make from ./install.sh.
 echo $ac_n "checking for a BSD compatible install""... $ac_c" 1>&6
-echo "configure:1142: checking for a BSD compatible install" >&5
+echo "configure:1146: checking for a BSD compatible install" >&5
 if test -z "$INSTALL"; then
 if eval "test \"`echo '$''{'ac_cv_path_install'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -1192,7 +1196,7 @@ if test "$INSTALL" = "${srcdir}/install-sh -c"; then
   INSTALL='\$(..)./install-sh -c'
 fi
 echo $ac_n "checking whether ln -s works""... $ac_c" 1>&6
-echo "configure:1196: checking whether ln -s works" >&5
+echo "configure:1200: checking whether ln -s works" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_LN_S'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1215,7 +1219,7 @@ fi
 
 # These programs are version sensitive.
 echo $ac_n "checking build system type""... $ac_c" 1>&6
-echo "configure:1219: checking build system type" >&5
+echo "configure:1223: checking build system type" >&5
 
 build_alias=$build
 case "$build_alias" in
@@ -1243,7 +1247,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1247: checking for $ac_word" >&5
+echo "configure:1251: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1276,7 +1280,7 @@ if test -z "$CC"; then
 else
   # Found it, now check the version.
   echo $ac_n "checking version of $CC""... $ac_c" 1>&6
-echo "configure:1280: checking version of $CC" >&5
+echo "configure:1284: checking version of $CC" >&5
   ac_prog_version=`$CC -v 2>&1 | sed -n 's/^.*version \([egcst0-9.-]*\).*$/\1/p'`
   case $ac_prog_version in
     '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
@@ -1296,7 +1300,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1300: checking for $ac_word" >&5
+echo "configure:1304: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_MAKE'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1329,7 +1333,7 @@ if test -z "$MAKE"; then
 else
   # Found it, now check the version.
   echo $ac_n "checking version of $MAKE""... $ac_c" 1>&6
-echo "configure:1333: checking version of $MAKE" >&5
+echo "configure:1337: checking version of $MAKE" >&5
   ac_prog_version=`$MAKE --version 2>&1 | sed -n 's/^.*version \([0-9][0-9.]*\), by.*$/\1/p'`
   case $ac_prog_version in
     '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
@@ -1350,7 +1354,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1354: checking for $ac_word" >&5
+echo "configure:1358: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_MSGFMT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1383,7 +1387,7 @@ if test -z "$MSGFMT"; then
 else
   # Found it, now check the version.
   echo $ac_n "checking version of $MSGFMT""... $ac_c" 1>&6
-echo "configure:1387: checking version of $MSGFMT" >&5
+echo "configure:1391: checking version of $MSGFMT" >&5
   ac_prog_version=`$MSGFMT --version 2>&1 | sed -n 's/^.*GNU gettext.*\([0-9][0-9]*\.[0-9]*\).*$/\1/p'`
   case $ac_prog_version in
     '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
@@ -1403,7 +1407,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1407: checking for $ac_word" >&5
+echo "configure:1411: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_MAKEINFO'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1436,7 +1440,7 @@ if test -z "$MAKEINFO"; then
 else
   # Found it, now check the version.
   echo $ac_n "checking version of $MAKEINFO""... $ac_c" 1>&6
-echo "configure:1440: checking version of $MAKEINFO" >&5
+echo "configure:1444: checking version of $MAKEINFO" >&5
   ac_prog_version=`$MAKEINFO --version 2>&1 | sed -n 's/^.*GNU texinfo \([0-9][0-9.]*\).*$/\1/p'`
   case $ac_prog_version in
     '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
@@ -1465,7 +1469,7 @@ test -n "$aux_missing" && echo "configure: warning:
 
 
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works""... $ac_c" 1>&6
-echo "configure:1469: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
+echo "configure:1473: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_cc_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1478,11 +1482,11 @@ ac_link='${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS
 cross_compiling=$ac_cv_prog_cc_cross
 
 cat > conftest.$ac_ext <<EOF
-#line 1482 "configure"
+#line 1486 "configure"
 #include "confdefs.h"
 main(){return(0);}
 EOF
-if { (eval echo configure:1486: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
+if { (eval echo configure:1490: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
   ac_cv_prog_cc_works=yes
   # If we can't run a trivial program, we are probably using a cross compiler.
   if (./conftest; exit) 2>/dev/null; then
@@ -1507,7 +1511,7 @@ else
  cross_linkable=yes
 fi
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler""... $ac_c" 1>&6
-echo "configure:1511: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
+echo "configure:1515: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_cc_cross'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1519,7 +1523,7 @@ echo "$ac_t""$ac_cv_prog_cc_cross" 1>&6
 cross_compiling=$ac_cv_prog_cc_cross
 
 echo $ac_n "checking whether we are using GNU C""... $ac_c" 1>&6
-echo "configure:1523: checking whether we are using GNU C" >&5
+echo "configure:1527: checking whether we are using GNU C" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gcc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1528,7 +1532,7 @@ else
   yes;
 #endif
 EOF
-if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:1532: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
+if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:1536: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
   ac_cv_prog_gcc=yes
 else
   ac_cv_prog_gcc=no
@@ -1541,7 +1545,7 @@ if test $ac_cv_prog_gcc != yes; then
 fi
 
 echo $ac_n "checking build system type""... $ac_c" 1>&6
-echo "configure:1545: checking build system type" >&5
+echo "configure:1549: checking build system type" >&5
 
 build_alias=$build
 case "$build_alias" in
@@ -1564,7 +1568,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1568: checking for $ac_word" >&5
+echo "configure:1572: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_BUILD_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1595,7 +1599,7 @@ done
 fi
 
 echo $ac_n "checking how to run the C preprocessor""... $ac_c" 1>&6
-echo "configure:1599: checking how to run the C preprocessor" >&5
+echo "configure:1603: checking how to run the C preprocessor" >&5
 # On Suns, sometimes $CPP names a directory.
 if test -n "$CPP" && test -d "$CPP"; then
   CPP=
@@ -1610,13 +1614,13 @@ else
   # On the NeXT, cc -E runs the code through the compiler's parser,
   # not just through cpp.
   cat > conftest.$ac_ext <<EOF
-#line 1614 "configure"
+#line 1618 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1620: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1624: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out`
 if test -z "$ac_err"; then
   :
@@ -1627,13 +1631,13 @@ else
   rm -rf conftest*
   CPP="${CC-cc} -E -traditional-cpp"
   cat > conftest.$ac_ext <<EOF
-#line 1631 "configure"
+#line 1635 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1637: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1641: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out`
 if test -z "$ac_err"; then
   :
@@ -1666,7 +1670,7 @@ LD=`$CC -print-prog-name=ld`
 
 # Determine whether we are using GNU binutils.
 echo $ac_n "checking whether $AS is GNU as""... $ac_c" 1>&6
-echo "configure:1670: checking whether $AS is GNU as" >&5
+echo "configure:1674: checking whether $AS is GNU as" >&5
 if eval "test \"`echo '$''{'libc_cv_prog_as_gnu'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1684,7 +1688,7 @@ rm -f a.out
 gnu_as=$libc_cv_prog_as_gnu
 
 echo $ac_n "checking whether $LD is GNU ld""... $ac_c" 1>&6
-echo "configure:1688: checking whether $LD is GNU ld" >&5
+echo "configure:1692: checking whether $LD is GNU ld" >&5
 if eval "test \"`echo '$''{'libc_cv_prog_ld_gnu'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1703,7 +1707,7 @@ gnu_ld=$libc_cv_prog_ld_gnu
 # Extract the first word of "${ac_tool_prefix}ar", so it can be a program name with args.
 set dummy ${ac_tool_prefix}ar; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1707: checking for $ac_word" >&5
+echo "configure:1711: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_AR'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1734,7 +1738,7 @@ fi
 # Extract the first word of "${ac_tool_prefix}ranlib", so it can be a program name with args.
 set dummy ${ac_tool_prefix}ranlib; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1738: checking for $ac_word" >&5
+echo "configure:1742: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_RANLIB'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1765,7 +1769,7 @@ if test -n "$ac_tool_prefix"; then
   # Extract the first word of "ranlib", so it can be a program name with args.
 set dummy ranlib; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1769: checking for $ac_word" >&5
+echo "configure:1773: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_RANLIB'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1799,7 +1803,7 @@ fi
 # Extract the first word of "${ac_tool_prefix}mig", so it can be a program name with args.
 set dummy ${ac_tool_prefix}mig; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1803: checking for $ac_word" >&5
+echo "configure:1807: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_MIG'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1839,7 +1843,7 @@ fi
 
 # check if ranlib is necessary
 echo $ac_n "checking whether ranlib is necessary""... $ac_c" 1>&6
-echo "configure:1843: checking whether ranlib is necessary" >&5
+echo "configure:1847: checking whether ranlib is necessary" >&5
 if eval "test \"`echo '$''{'libc_cv_ranlib_necessary'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1873,7 +1877,7 @@ fi
 # - two terminals occur directly after each other
 # - the path contains an element with a dot in it
 echo $ac_n "checking LD_LIBRARY_PATH variable""... $ac_c" 1>&6
-echo "configure:1877: checking LD_LIBRARY_PATH variable" >&5
+echo "configure:1881: checking LD_LIBRARY_PATH variable" >&5
 case ${LD_LIBRARY_PATH} in
   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
     ld_library_path_setting="contains current directory"
@@ -1893,7 +1897,7 @@ fi
 # Extract the first word of "bash", so it can be a program name with args.
 set dummy bash; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1897: checking for $ac_word" >&5
+echo "configure:1901: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_BASH'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1935,7 +1939,7 @@ if test "$BASH" = no; then
   # Extract the first word of "ksh", so it can be a program name with args.
 set dummy ksh; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1939: checking for $ac_word" >&5
+echo "configure:1943: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_KSH'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1981,7 +1985,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1985: checking for $ac_word" >&5
+echo "configure:1989: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_AWK'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2014,7 +2018,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:2018: checking for $ac_word" >&5
+echo "configure:2022: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_PERL'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2049,7 +2053,7 @@ test -n "$PERL" || PERL="no"
 
 
 echo $ac_n "checking for signed size_t type""... $ac_c" 1>&6
-echo "configure:2053: checking for signed size_t type" >&5
+echo "configure:2057: checking for signed size_t type" >&5
 if eval "test \"`echo '$''{'libc_cv_signed_size_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2073,12 +2077,12 @@ EOF
 fi
 
 echo $ac_n "checking for libc-friendly stddef.h""... $ac_c" 1>&6
-echo "configure:2077: checking for libc-friendly stddef.h" >&5
+echo "configure:2081: checking for libc-friendly stddef.h" >&5
 if eval "test \"`echo '$''{'libc_cv_friendly_stddef'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2082 "configure"
+#line 2086 "configure"
 #include "confdefs.h"
 #define __need_size_t
 #define __need_wchar_t
@@ -2093,7 +2097,7 @@ size_t size; wchar_t wchar;
 if (&size == NULL || &wchar == NULL) abort ();
 ; return 0; }
 EOF
-if { (eval echo configure:2097: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2101: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libc_cv_friendly_stddef=yes
 else
@@ -2112,7 +2116,7 @@ override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
 fi
 
 echo $ac_n "checking whether we need to use -P to assemble .S files""... $ac_c" 1>&6
-echo "configure:2116: checking whether we need to use -P to assemble .S files" >&5
+echo "configure:2120: checking whether we need to use -P to assemble .S files" >&5
 if eval "test \"`echo '$''{'libc_cv_need_minus_P'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2135,7 +2139,7 @@ asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
 fi
 
 echo $ac_n "checking for assembler global-symbol directive""... $ac_c" 1>&6
-echo "configure:2139: checking for assembler global-symbol directive" >&5
+echo "configure:2143: checking for assembler global-symbol directive" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_global_directive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2165,7 +2169,7 @@ EOF
 fi
 
 echo $ac_n "checking for .set assembler directive""... $ac_c" 1>&6
-echo "configure:2169: checking for .set assembler directive" >&5
+echo "configure:2173: checking for .set assembler directive" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_set_directive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2199,7 +2203,7 @@ EOF
 fi
 
 echo $ac_n "checking for .symver assembler directive""... $ac_c" 1>&6
-echo "configure:2203: checking for .symver assembler directive" >&5
+echo "configure:2207: checking for .symver assembler directive" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_symver_directive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2218,7 +2222,7 @@ fi
 
 echo "$ac_t""$libc_cv_asm_symver_directive" 1>&6
 echo $ac_n "checking for ld --version-script""... $ac_c" 1>&6
-echo "configure:2222: checking for ld --version-script" >&5
+echo "configure:2226: checking for ld --version-script" >&5
 if eval "test \"`echo '$''{'libc_cv_ld_version_script_option'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2241,7 +2245,7 @@ EOF
     if { ac_try='${CC-cc} $CFLAGS -shared -o conftest.so conftest.o
 					-nostartfiles -nostdlib
 					-Wl,--version-script,conftest.map
-		       1>&5'; { (eval echo configure:2245: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; };
+		       1>&5'; { (eval echo configure:2249: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; };
     then
       libc_cv_ld_version_script_option=yes
     else
@@ -2279,7 +2283,7 @@ if test $VERSIONING = no; then
 fi
 if test $elf = yes; then
   echo $ac_n "checking for .previous assembler directive""... $ac_c" 1>&6
-echo "configure:2283: checking for .previous assembler directive" >&5
+echo "configure:2287: checking for .previous assembler directive" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_previous_directive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2287,7 +2291,7 @@ else
 .section foo_section
 .previous
 EOF
-  if { ac_try='${CC-cc} -c $CFLAGS conftest.s 1>&5'; { (eval echo configure:2291: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
+  if { ac_try='${CC-cc} -c $CFLAGS conftest.s 1>&5'; { (eval echo configure:2295: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
     libc_cv_asm_previous_directive=yes
   else
     libc_cv_asm_previous_directive=no
@@ -2303,7 +2307,7 @@ EOF
 
   else
     echo $ac_n "checking for .popsection assembler directive""... $ac_c" 1>&6
-echo "configure:2307: checking for .popsection assembler directive" >&5
+echo "configure:2311: checking for .popsection assembler directive" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_popsection_directive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2311,7 +2315,7 @@ else
 .pushsection foo_section
 .popsection
 EOF
-    if { ac_try='${CC-cc} -c $CFLAGS conftest.s 1>&5'; { (eval echo configure:2315: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
+    if { ac_try='${CC-cc} -c $CFLAGS conftest.s 1>&5'; { (eval echo configure:2319: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
       libc_cv_asm_popsection_directive=yes
     else
       libc_cv_asm_popsection_directive=no
@@ -2331,12 +2335,12 @@ fi
 
 if test $elf != yes; then
   echo $ac_n "checking for .init and .fini sections""... $ac_c" 1>&6
-echo "configure:2335: checking for .init and .fini sections" >&5
+echo "configure:2339: checking for .init and .fini sections" >&5
 if eval "test \"`echo '$''{'libc_cv_have_initfini'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2340 "configure"
+#line 2344 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -2345,7 +2349,7 @@ asm (".section .init");
 				    asm (".text");
 ; return 0; }
 EOF
-if { (eval echo configure:2349: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2353: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libc_cv_have_initfini=yes
 else
@@ -2373,19 +2377,19 @@ if test $elf = yes; then
 else
   if test $ac_cv_prog_cc_works = yes; then
     echo $ac_n "checking for _ prefix on C symbol names""... $ac_c" 1>&6
-echo "configure:2377: checking for _ prefix on C symbol names" >&5
+echo "configure:2381: checking for _ prefix on C symbol names" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_underscores'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2382 "configure"
+#line 2386 "configure"
 #include "confdefs.h"
 asm ("_glibc_foobar:");
 int main() {
 glibc_foobar ();
 ; return 0; }
 EOF
-if { (eval echo configure:2389: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
+if { (eval echo configure:2393: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
   rm -rf conftest*
   libc_cv_asm_underscores=yes
 else
@@ -2400,17 +2404,17 @@ fi
 echo "$ac_t""$libc_cv_asm_underscores" 1>&6
   else
     echo $ac_n "checking for _ prefix on C symbol names""... $ac_c" 1>&6
-echo "configure:2404: checking for _ prefix on C symbol names" >&5
+echo "configure:2408: checking for _ prefix on C symbol names" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_underscores'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2409 "configure"
+#line 2413 "configure"
 #include "confdefs.h"
 void underscore_test(void) {
 return; }
 EOF
-if { (eval echo configure:2414: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2418: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   if grep _underscore_test conftest* >/dev/null; then
     rm -f conftest*
     libc_cv_asm_underscores=yes
@@ -2442,7 +2446,7 @@ if test $elf = yes; then
 fi
 
 echo $ac_n "checking for assembler .weak directive""... $ac_c" 1>&6
-echo "configure:2446: checking for assembler .weak directive" >&5
+echo "configure:2450: checking for assembler .weak directive" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_weak_directive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2465,7 +2469,7 @@ echo "$ac_t""$libc_cv_asm_weak_directive" 1>&6
 
 if test $libc_cv_asm_weak_directive = no; then
   echo $ac_n "checking for assembler .weakext directive""... $ac_c" 1>&6
-echo "configure:2469: checking for assembler .weakext directive" >&5
+echo "configure:2473: checking for assembler .weakext directive" >&5
 if eval "test \"`echo '$''{'libc_cv_asm_weakext_directive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2503,7 +2507,7 @@ EOF
 fi
 
 echo $ac_n "checking for ld --no-whole-archive""... $ac_c" 1>&6
-echo "configure:2507: checking for ld --no-whole-archive" >&5
+echo "configure:2511: checking for ld --no-whole-archive" >&5
 if eval "test \"`echo '$''{'libc_cv_ld_no_whole_archive'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2514,7 +2518,7 @@ __throw () {}
 EOF
 if { ac_try='${CC-cc} $CFLAGS
 			    -nostdlib -nostartfiles -Wl,--no-whole-archive
-			    -o conftest conftest.c 1>&5'; { (eval echo configure:2518: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
+			    -o conftest conftest.c 1>&5'; { (eval echo configure:2522: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
   libc_cv_ld_no_whole_archive=yes
 else
   libc_cv_ld_no_whole_archive=no
@@ -2528,7 +2532,7 @@ if test $libc_cv_ld_no_whole_archive = yes; then
 fi
 
 echo $ac_n "checking for gcc -fno-exceptions""... $ac_c" 1>&6
-echo "configure:2532: checking for gcc -fno-exceptions" >&5
+echo "configure:2536: checking for gcc -fno-exceptions" >&5
 if eval "test \"`echo '$''{'libc_cv_gcc_no_exceptions'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2539,7 +2543,7 @@ __throw () {}
 EOF
 if { ac_try='${CC-cc} $CFLAGS
 			    -nostdlib -nostartfiles -fno-exceptions
-			    -o conftest conftest.c 1>&5'; { (eval echo configure:2543: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
+			    -o conftest conftest.c 1>&5'; { (eval echo configure:2547: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
   libc_cv_gcc_no_exceptions=yes
 else
   libc_cv_gcc_no_exceptions=no
@@ -2554,14 +2558,14 @@ fi
 
 if test "$base_machine" = alpha ; then
 echo $ac_n "checking for function ..ng prefix""... $ac_c" 1>&6
-echo "configure:2558: checking for function ..ng prefix" >&5
+echo "configure:2562: checking for function ..ng prefix" >&5
 if eval "test \"`echo '$''{'libc_cv_gcc_alpha_ng_prefix'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.c <<\EOF
 foo () { }
 EOF
-if { ac_try='${CC-cc} -S conftest.c -o - | fgrep "\$foo..ng" > /dev/null'; { (eval echo configure:2565: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; };
+if { ac_try='${CC-cc} -S conftest.c -o - | fgrep "\$foo..ng" > /dev/null'; { (eval echo configure:2569: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; };
 then
   libc_cv_gcc_alpha_ng_prefix=yes
 else
@@ -2588,19 +2592,19 @@ if test "$host_cpu" = powerpc ; then
 # Check for a bug present in at least versions 2.8.x of GCC
 # and versions 1.0.x of EGCS.
 echo $ac_n "checking whether clobbering cr0 causes problems""... $ac_c" 1>&6
-echo "configure:2592: checking whether clobbering cr0 causes problems" >&5
+echo "configure:2596: checking whether clobbering cr0 causes problems" >&5
 if eval "test \"`echo '$''{'libc_cv_c_asmcr0_bug'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2597 "configure"
+#line 2601 "configure"
 #include "confdefs.h"
 int tester(int x) { asm ("" : : : "cc"); return x & 123; }
 int main() {
 
 ; return 0; }
 EOF
-if { (eval echo configure:2604: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2608: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libc_cv_c_asmcr0_bug='no'
 else
@@ -2622,12 +2626,12 @@ fi
 fi
 
 echo $ac_n "checking for DWARF2 unwind info support""... $ac_c" 1>&6
-echo "configure:2626: checking for DWARF2 unwind info support" >&5
+echo "configure:2630: checking for DWARF2 unwind info support" >&5
 if eval "test \"`echo '$''{'libc_cv_gcc_dwarf2_unwind_info'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.c <<EOF
-#line 2631 "configure"
+#line 2635 "configure"
 static char __EH_FRAME_BEGIN__;
 _start ()
 {
@@ -2654,7 +2658,7 @@ __bzero () {}
 EOF
 if { ac_try='${CC-cc} $CFLAGS -DCHECK__register_frame_info
 			    -nostdlib -nostartfiles
-			    -o conftest conftest.c -lgcc >&5'; { (eval echo configure:2658: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
+			    -o conftest conftest.c -lgcc >&5'; { (eval echo configure:2662: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
   libc_cv_gcc_dwarf2_unwind_info=static
 else
   libc_cv_gcc_dwarf2_unwind_info=no
@@ -2662,7 +2666,7 @@ fi
 if test $libc_cv_gcc_dwarf2_unwind_info = no; then
   if { ac_try='${CC-cc} $CFLAGS -DCHECK__register_frame
 			      -nostdlib -nostartfiles
-			      -o conftest conftest.c -lgcc >&5'; { (eval echo configure:2666: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
+			      -o conftest conftest.c -lgcc >&5'; { (eval echo configure:2670: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
     libc_cv_gcc_dwarf2_unwind_info=yes
   else
     libc_cv_gcc_dwarf2_unwind_info=no
@@ -2736,7 +2740,7 @@ if test "$uname" = "sysdeps/generic"; then
   fi
 
   echo $ac_n "checking OS release for uname""... $ac_c" 1>&6
-echo "configure:2740: checking OS release for uname" >&5
+echo "configure:2744: checking OS release for uname" >&5
 if eval "test \"`echo '$''{'libc_cv_uname_release'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2758,7 +2762,7 @@ echo "$ac_t""$libc_cv_uname_release" 1>&6
   uname_release="$libc_cv_uname_release"
 
   echo $ac_n "checking OS version for uname""... $ac_c" 1>&6
-echo "configure:2762: checking OS version for uname" >&5
+echo "configure:2766: checking OS version for uname" >&5
 if eval "test \"`echo '$''{'libc_cv_uname_version'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2780,7 +2784,7 @@ else
 fi
 
 echo $ac_n "checking stdio selection""... $ac_c" 1>&6
-echo "configure:2784: checking stdio selection" >&5
+echo "configure:2788: checking stdio selection" >&5
 
 case $stdio in
 libio) cat >> confdefs.h <<\EOF
@@ -2792,7 +2796,7 @@ esac
 echo "$ac_t""$stdio" 1>&6
 
 echo $ac_n "checking ldap selection""... $ac_c" 1>&6
-echo "configure:2796: checking ldap selection" >&5
+echo "configure:2800: checking ldap selection" >&5
 
 case $add_ons in
 *ldap*)
@@ -2843,7 +2847,7 @@ if test $shared = default; then
 fi
 
 echo $ac_n "checking whether -fPIC is default""... $ac_c" 1>&6
-echo "configure:2847: checking whether -fPIC is default" >&5
+echo "configure:2851: checking whether -fPIC is default" >&5
 if eval "test \"`echo '$''{'pic_default'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
diff --git a/configure.in b/configure.in
index 7b07d4b0a1..06c5496e08 100644
--- a/configure.in
+++ b/configure.in
@@ -429,7 +429,11 @@ changequote([,])dnl
 done
 
 # Add the default directories.
-sysnames="$names sysdeps/generic"
+if test "$elf" = yes; then
+  sysnames="$names sysdeps/generic/elf sysdeps/generic"
+else
+  sysnames="$names sysdeps/generic"
+fi
 AC_SUBST(sysnames)
 # The other names were emitted during the scan.
 AC_MSG_RESULT(sysdeps/generic)
diff --git a/debug/Makefile b/debug/Makefile
new file mode 100644
index 0000000000..5286cc15fd
--- /dev/null
+++ b/debug/Makefile
@@ -0,0 +1,32 @@
+# Copyright (C) 1998 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Library General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Library General Public License for more details.
+
+# You should have received a copy of the GNU Library General Public
+# License along with the GNU C Library; see the file COPYING.LIB.  If not,
+# write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+#
+#	Sub-makefile for debug portion of the library.
+#
+subdir	:= debug
+
+headers	:= execinfo.h
+
+routines := backtrace backtracesyms
+
+CFLAGS-backtrace.c = -fno-omit-frame-pointer
+
+tests = backtrace-tst
+
+include ../Rules
diff --git a/debug/backtrace-tst.c b/debug/backtrace-tst.c
new file mode 100644
index 0000000000..d899fb009f
--- /dev/null
+++ b/debug/backtrace-tst.c
@@ -0,0 +1,44 @@
+#include <execinfo.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+static int
+compare (const void *p1, const void *p2)
+{
+  void *ba[20];
+  int n = backtrace (ba, sizeof (ba) / sizeof (ba[0]));
+  if (n != 0)
+    {
+      char **names = backtrace_symbols (ba, n);
+      if (names != NULL)
+	{
+	  int i;
+	  printf ("called from %s\n", names[0]);
+	  for (i = 1; i < n; ++i)
+	    printf ("            %s\n", names[i]);
+	  free (names);
+	}
+    }
+
+  return *(uint32_t *) p1 - *(uint32_t *) p2;
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  uint32_t arr[20];
+  size_t cnt;
+
+  for (cnt = 0; cnt < sizeof (arr) / sizeof (arr[0]); ++cnt)
+    arr[cnt] = random ();
+
+  qsort (arr, sizeof (arr) / sizeof (arr[0]), sizeof (arr[0]), compare);
+
+  for (cnt = 0; cnt < sizeof (arr) / sizeof (arr[0]); ++cnt)
+    printf ("%" PRIx32 "\n", arr[cnt]);
+
+  return 0;
+}
diff --git a/debug/execinfo.h b/debug/execinfo.h
new file mode 100644
index 0000000000..07bed92446
--- /dev/null
+++ b/debug/execinfo.h
@@ -0,0 +1,39 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _EXECINFO_H
+#define _EXECINFO_H 1
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* Store up to SIZE return address of the current program state in
+   ARRAY and return the exact number of values stored.  */
+extern int __backtrace __P ((void **__array, int __size));
+extern int backtrace __P ((void **__array, int __size));
+
+
+/* Return names of functions from the backtrace list in ARRAY in a newly
+   malloc()ed memory block.  */
+extern char **__backtrace_symbols __P ((__const void **__array, int __size));
+extern char **backtrace_symbols __P ((__const void **__array, int __size));
+
+__END_DECLS
+
+#endif /* execinfo.h  */
diff --git a/libc.map b/libc.map
index a7a1b049dd..e8ae15babd 100644
--- a/libc.map
+++ b/libc.map
@@ -490,7 +490,7 @@ GLIBC_2.1 {
     __syscall_rt_sigqueueinfo;
     __xstat64; __fxstat64; __lxstat64;
     __pread64; __pwrite64;
-    __backtrace; __backtracesyms;
+    __backtrace; __backtrace_symbols;
 
     # helper functions
     __libc_current_sigrtmin; __libc_current_sigrtmax; __libc_allocate_rtsig;
@@ -536,7 +536,7 @@ GLIBC_2.1 {
     authdes_create; authdes_getucred; authdes_pk_create;
 
     # b*
-    backtrace; backtracesyms;
+    backtrace; backtrace_symbols;
 
     # c*
     capget; capset; cbc_crypt; creat64;
diff --git a/sysdeps/generic/backtrace.c b/sysdeps/generic/backtrace.c
new file mode 100644
index 0000000000..26bf9d41cf
--- /dev/null
+++ b/sysdeps/generic/backtrace.c
@@ -0,0 +1,34 @@
+/* Return backtrace of current program state.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <execinfo.h>
+
+
+int
+__backtrace (array, size)
+     void **array;
+     int size;
+{
+  /* We don't generally have the possibility to determine the stack
+     trace.  Even gcc's `__builtin_return_address' feature cannot help
+     since it requires a constant argument.  */
+  return 0;
+}
+weak_alias (__backtrace, backtrace)
diff --git a/sysdeps/generic/backtracesyms.c b/sysdeps/generic/backtracesyms.c
new file mode 100644
index 0000000000..36bd39caaf
--- /dev/null
+++ b/sysdeps/generic/backtracesyms.c
@@ -0,0 +1,58 @@
+/* Return list with names for address in backtrace.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <execinfo.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/* Assume the worst for the width of an address.  */
+#define WORD_WIDTH 16
+
+
+char **
+__backtrace_symbols (array, size)
+     const void **array;
+     int size;
+{
+  int cnt;
+  size_t total = 0;
+  const char **result;
+
+  /* We can compute the text size needed for the symbols since we print
+     them all as "[%<addr>]".  */
+  total = size * (WORD_WIDTH + 3);
+
+  /* Allocate memory for the result.  */
+  result = malloc (size * sizeof (char *) + total);
+  if (result != NULL)
+    {
+      char *last = (char *) (result + size);
+
+      for (cnt = 0; cnt < size; ++cnt)
+	{
+	  result[cnt] = last;
+	  last += 1 + sprintf (last, "[+%p]", array[cnt]);
+	}
+    }
+
+  return result;
+}
+weak_alias (__backtrace_symbols, backtrace_symbols)
diff --git a/sysdeps/generic/elf/backtracesyms.c b/sysdeps/generic/elf/backtracesyms.c
new file mode 100644
index 0000000000..11a65ea267
--- /dev/null
+++ b/sysdeps/generic/elf/backtracesyms.c
@@ -0,0 +1,88 @@
+/* Return list with names for address in backtrace.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <execinfo.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <elf/ldsodefs.h>
+
+#if __ELF_NATIVE_CLASS == 32
+# define WORD_WIDTH 8
+#else
+/* We assyme 64bits.  */
+# define WORD_WIDTH 16
+#endif
+
+
+char **
+__backtrace_symbols (array, size)
+     const void **array;
+     int size;
+{
+  Dl_info info[size];
+  int status[size];
+  int cnt;
+  size_t total = 0;
+  char **result;
+
+  /* Fill in the information we can get from `dladdr'.  */
+  for (cnt = 0; cnt < size; ++cnt)
+    {
+      status[cnt] = _dl_addr (array[cnt], &info[cnt]);
+      if (status[cnt] && info[cnt].dli_fname && info[cnt].dli_fname[0] != '\0')
+	/* We have some info, compute the length of the string which will be
+	   "<fct-name>(<sym-name>)[+offset].  */
+	total += (strlen (info[cnt].dli_fname ?: "")
+		  + (info[cnt].dli_sname
+		     ? strlen (info[cnt].dli_sname) + 2
+		     : 0)
+		  + WORD_WIDTH + 6);
+      else
+	total += 6 + WORD_WIDTH;
+    }
+
+  /* Allocate memory for the result.  */
+  result = malloc (size * sizeof (char *) + total);
+  if (result != NULL)
+    {
+      char *last = (char *) (result + size);
+
+      for (cnt = 0; cnt < size; ++cnt)
+	{
+	  result[cnt] = last;
+
+	  if (status[cnt] && info[cnt].dli_fname
+	      && info[cnt].dli_fname[0] != '\0')
+	    last += 1 + sprintf (last, "%s%s%s%s[+%p]",
+				 info[cnt].dli_fname ?: "",
+				 info[cnt].dli_sname ? "(" : "",
+				 info[cnt].dli_sname ?: "",
+				 info[cnt].dli_sname ? ") " : " ",
+				 info[cnt].dli_fbase);
+	  else
+	    last += 1 + sprintf (last, "[+%p]", array[cnt]);
+	}
+    }
+
+  return result;
+}
+weak_alias (__backtrace_symbols, backtrace_symbols)
diff --git a/sysdeps/i386/backtrace.c b/sysdeps/i386/backtrace.c
new file mode 100644
index 0000000000..0d484c7723
--- /dev/null
+++ b/sysdeps/i386/backtrace.c
@@ -0,0 +1,63 @@
+/* Return backtrace of current program state.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <execinfo.h>
+
+
+/* This is the stack alyout we see with every stack frame.
+
+            +-----------------+        +-----------------+
+    %ebp -> | %ebp last frame--------> | %ebp last frame--->...
+            |                 |        |                 |
+            | return address  |        | return address  |
+            +-----------------+        +-----------------+
+*/
+struct layout
+{
+  struct layout *next;
+  void *return_address;
+};
+
+int
+__backtrace (array, size)
+     void **array;
+     int size;
+{
+  /* We assume that all the code is generated with frame pointers set.  */
+  register void *ebp __asm__ ("ebp");
+  struct layout *current;
+  int cnt = 0;
+
+  /* We skip the call to this function, it makes no sense to record it.  */
+  current = (struct layout *) ebp;
+  while (cnt < size)
+    {
+      if (current == NULL)
+	/* This means the toplevel is reached.  */
+	break;
+
+      array[cnt++] = current->return_address;
+
+      current = current->next;
+    }
+
+  return cnt;
+}
+weak_alias (__backtrace, backtrace)