Add safe frame-pointer backtrace unwinder

configure.ac

@@ -1448,6 +1448,33 @@ if test "x$backtrace_method" = "x" -a "x$enable_prof_libunwind" = "x1" ; then
   fi
 fi
 
+if test `uname -s` = "Linux"
+then
+  AC_ARG_ENABLE([prof-frameptr],
+    [AS_HELP_STRING([--enable-prof-frameptr], [Use optimized frame pointer unwinder for backtracing (Linux only)])],
+  [if test "x$enable_prof_frameptr" = "xno" ; then
+    enable_prof_frameptr="0"
+  else
+    enable_prof_frameptr="1"
+    if test "x$enable_prof" = "x0" ; then
+      AC_MSG_ERROR([--enable-prof-frameptr should only be used with --enable-prof])
+    fi
+  fi
+  ],
+  [enable_prof_frameptr="0"]
+  )
+  if test "x$backtrace_method" = "x" -a "x$enable_prof_frameptr" = "x1" \
+      -a "x$GCC" = "xyes" ; then
+    JE_CFLAGS_ADD([-fno-omit-frame-pointer])
+    backtrace_method="frame pointer linux"
+    AC_DEFINE([JEMALLOC_PROF_FRAME_POINTER], [ ], [ ])
+  else
+    enable_prof_frameptr="0"
+  fi
+else
+  enable_prof_frameptr="0"
+fi
+
 AC_ARG_ENABLE([prof-libgcc],
   [AS_HELP_STRING([--disable-prof-libgcc],
   [Do not use libgcc for backtracing])],
@@ -2847,6 +2874,7 @@ AC_MSG_RESULT([stats              : ${enable_stats}])
 AC_MSG_RESULT([experimental_smallocx : ${enable_experimental_smallocx}])
 AC_MSG_RESULT([prof               : ${enable_prof}])
 AC_MSG_RESULT([prof-libunwind     : ${enable_prof_libunwind}])
+AC_MSG_RESULT([prof-frameptr      : ${enable_prof_frameptr}])
 AC_MSG_RESULT([prof-libgcc        : ${enable_prof_libgcc}])
 AC_MSG_RESULT([prof-gcc           : ${enable_prof_gcc}])
 AC_MSG_RESULT([fill               : ${enable_fill}])