From: Romain Naour <romain.naour@openwide.fr>
Date: Sun, 6 Apr 2014 21:02:41 +0000 (+0200)
Subject: Fix: disable liblttng-ust-dl if dlinfo is not available in C library
X-Git-Tag: v2.4.1~3
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=88a15b8f075177056017dbcc2e0c6d624805a34e;p=lttng-ust.git

Fix: disable liblttng-ust-dl if dlinfo is not available in C library

According to uClibc commit [1], dlinfo is not available.
To be able to use LTTng UST with uClibc, we need to disable
the Dynamic Linker Tracing functionality [2].

[1] http://git.uclibc.org/uClibc/commit/?id=f3c9dc499c5c787ddd8c4320f2d44d2ae6e40c22
[2] http://lists.lttng.org/pipermail/lttng-dev/2014-February/022423.html

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/Makefile.am b/Makefile.am
index b79d2dd9..c907ff1b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4,11 +4,14 @@ SUBDIRS = . include snprintf libringbuffer liblttng-ust-comm \
 		liblttng-ust \
 		liblttng-ust-ctl \
 		liblttng-ust-fork \
-		liblttng-ust-dl \
 		liblttng-ust-libc-wrapper \
 		liblttng-ust-cyg-profile \
 		tools
 
+if HAVE_DLINFO
+SUBDIRS += liblttng-ust-dl
+endif
+
 if BUILD_JNI_INTERFACE
 SUBDIRS += liblttng-ust-java liblttng-ust-jul
 endif
diff --git a/configure.ac b/configure.ac
index a62b2aa8..5d2d5dfd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -145,6 +145,9 @@ AC_C_INLINE
 AC_FUNC_MALLOC
 AC_CHECK_FUNCS([gettimeofday munmap socket strerror strtol sched_getcpu sysconf])
 
+AC_CHECK_FUNCS([dlinfo])
+AM_CONDITIONAL([HAVE_DLINFO], [test "${ac_cv_func_dlinfo}" = "yes"])
+
 CFLAGS="-Wall $CFLAGS"
 
 # URCU