On Fri 20 May 2011 12:07, Andy Wingo <wi...@pobox.com> writes:

> Hi Douglas,
>
> On Tue 10 May 2011 20:16, Douglas Mencken <dougmenc...@gmail.com> writes:
>
>> To get clock_getcpuclockid, it is needed to link with librt, where
>> this symbol is present

Does this patch fix it for you?

>From 5ad05b93a3f02be7c66fbab9c49e23ca314b7c33 Mon Sep 17 00:00:00 2001
From: Andy Wingo <wi...@pobox.com>
Date: Fri, 20 May 2011 18:48:33 +0200
Subject: [PATCH] check for clock_getcpuclockid in gl_CLOCK_TIME

* acinclude.m4 (gl_CLOCK_TIME): It could be that clock_gettime is in
  libc but clock_getcpuclockid is not, so check for that explicitly.
---
 acinclude.m4 |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/acinclude.m4 b/acinclude.m4
index ba8b090..5bd1ced 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -529,8 +529,14 @@ AC_DEFUN([gl_CLOCK_TIME],
   AC_SUBST([LIB_CLOCK_GETTIME])
   gl_saved_libs=$LIBS
     AC_SEARCH_LIBS([clock_gettime], [rt posix4],
-                   [test "$ac_cv_search_clock_gettime" = "none required" ||
-                    LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
-    AC_CHECK_FUNCS([clock_gettime clock_settime])
+                   [if test "$ac_cv_search_clock_gettime" = "none required"; 
then
+                      AC_SEARCH_LIBS([clock_getcpuclockid], [rt posix4],
+                                     [test "$ac_cv_search_clock_getcpuclockid" 
= "none required" \
+                                      || 
LIB_CLOCK_GETTIME=$ac_cv_search_clock_getcpuclockid],
+                                     
[LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
+                    else
+                      LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime
+                    fi])
+    AC_CHECK_FUNCS([clock_gettime clock_settime clock_getcpuclockid])
   LIBS=$gl_saved_libs
 ])
-- 
1.7.5.1

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