[Bug 608164] Re: c++0x: _GLIBCXX_USE_CLOCK_MONOTONIC is not defined

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gcc-4.4 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/608164

Title:
  c++0x: _GLIBCXX_USE_CLOCK_MONOTONIC is not defined

Status in “gcc-4.4” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: gcc-4.4

  std::chrono::monotonic_clock in <chrono> can be defined differently
  (typedef system_clock or proper monotonic_clock) based on the define
  _GLIBCXX_USE_CLOCK_MONOTONIC.

  The latter should be defined from the gcc configuration scrips based
  on whether the clock_gettime supports monotonic clock or not.

  Ubuntu Lucid obviously supports monotonic clock (see example below),
  however _GLIBCXX_USE_CLOCK_MONOTONIC is not defined in
  /usr/include/c++/4.4/x86_64-linux-gnu/bits/c++config.h.

  ---

  #include <unistd.h>
  #include <stdio.h>
  #include <time.h>
  #include <errno.h>
  #include <string.h>
   
  int
  main ()
  {
            struct timespec tp;
            int ret = clock_gettime(CLOCK_MONOTONIC, &tp);
  	if (ret < 0)
  		printf("%s\n", strerror(errno));
   return ret;
  }

  $ gcc monotonic.c -o monotonic -lrt
  --- 
  Architecture: amd64
  DistroRelease: Ubuntu 10.04
  NonfreeKernelModules: binfmt_misc snd_hda_codec_atihdmi snd_hda_codec_analog tpm_infineon arc4 snd_hda_intel iwlagn snd_hda_codec snd_pcm_oss snd_hwdep snd_mixer_oss snd_seq_dummy snd_pcm snd_seq_oss snd_seq_midi iwlcore snd_rawmidi pcmcia uinput radeon snd_seq_midi_event joydev snd_seq snd_timer snd_seq_device ttm hp_accel mac80211 uvcvideo lis3lv02d drm_kms_helper sdhci_pci videodev coretemp video sdhci input_polldev snd tpm_tis yenta_socket psmouse v4l1_compat tpm drm ppdev rsrc_nonstatic v4l2_compat_ioctl32 tpm_bios output led_class soundcore i2c_algo_bit serio_raw pcmcia_core hp_wmi cfg80211 parport_pc snd_page_alloc intel_agp lp parport usbhid hid ohci1394 ieee1394 e1000e ahci
  Package: gcc-4.4 4.4.3-4ubuntu5
  PackageArchitecture: amd64
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.utf8
   SHELL=/bin/bash
  Tags: lucid
  Uname: Linux 2.6.34-020634-generic x86_64
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare vboxusers

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