From: Olof Johansson <olof.johansson@axis.com>
Date: Wed, 10 Feb 2016 09:39:50 +0000 (+0100)
Subject: Fix: configure.ac: check for possibly required libs for clock_gettime
X-Git-Tag: v0.9.2~3
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=b4bdf51ade6cab655ad59ded867864adc762b3f1;p=userspace-rcu.git

Fix: configure.ac: check for possibly required libs for clock_gettime

On some platforms, you have to link with rt to get clock_gettime. This
solves errors like:

 undefined reference to `clock_gettime'

Fixes: #996

Signed-off-by: Olof Johansson <olof.johansson@axis.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/configure.ac b/configure.ac
index b86f371..fcad176 100644
--- a/configure.ac
+++ b/configure.ac
@@ -79,7 +79,6 @@ AC_FUNC_MMAP
 AC_FUNC_FORK
 AC_CHECK_FUNCS([ \
 	atexit \
-	clock_gettime \
 	getcpuid \
 	gettid \
 	gettimeofday \
@@ -215,6 +214,11 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 	compat_futex_test=1
 ])
 
+# Search for clock_gettime
+AC_SEARCH_LIBS([clock_gettime], [rt], [],
+	[AC_MSG_ERROR([Cannot find clock_gettime function.])]
+)
+
 # Check for pthread
 AC_CHECK_LIB([pthread], [pthread_create],
 	[AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],