diff options
| author | Mark Wielaard <mark@klomp.org> | 2018-03-18 00:24:08 +0100 |
|---|---|---|
| committer | Mark Wielaard <mark@klomp.org> | 2018-03-28 16:30:27 +0200 |
| commit | afffdff29228db03e2131af577f58a22aec6c1fe (patch) | |
| tree | 1de9a2890a9976fbb49c779ec38fa2fe97af02ce /configure.ac | |
| parent | f0d7b3e14779cdf5facede98edc924ef1266b785 (diff) | |
libdwfl: Use process_vm_readv when available.
If possible use process_vm_readv to read 4K blocks instead of fetching
each word individually with ptrace. For unwinding this often means we
only have to do one process_vm_readv of the stack instead of dozens of
ptrace calls. There is one 4K cache per process, cleared whenever a
thread is detached.
Signed-off-by: Mark Wielaard <mark@klomp.org>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index 4cdb12af..ab32cbc8 100644 --- a/configure.ac +++ b/configure.ac @@ -1,7 +1,7 @@ dnl Process this file with autoconf to produce a configure script. dnl Configure input file for elfutils. -*-autoconf-*- dnl -dnl Copyright (C) 1996-2017 Red Hat, Inc. +dnl Copyright (C) 1996-2018 Red Hat, Inc. dnl dnl This file is part of elfutils. dnl @@ -41,7 +41,7 @@ fi AC_CONFIG_AUX_DIR([config]) AC_CONFIG_FILES([config/Makefile]) -AC_COPYRIGHT([Copyright (C) 1996-2017 The elfutils developers.]) +AC_COPYRIGHT([Copyright (C) 1996-2018 The elfutils developers.]) AC_PREREQ(2.63) dnl Minimum Autoconf version required. dnl We use GNU make extensions; automake 1.10 defaults to -Wportability. @@ -370,6 +370,8 @@ AC_CHECK_DECLS([mempcpy],[],[], [#define _GNU_SOURCE #include <string.h>]) +AC_CHECK_FUNCS([process_vm_readv]) + AC_CHECK_LIB([stdc++], [__cxa_demangle], [dnl AC_DEFINE([USE_DEMANGLE], [1], [Defined if demangling is enabled])]) AM_CONDITIONAL(DEMANGLE, test "x$ac_cv_lib_stdcpp___cxa_demangle" = "xyes") |