NetCube-Systems-Austria/kumquat-buildroot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

lttng-libust: Disable liblttng-ust-dl with uClibc.

Browse Source 
According to uClibc commit [1], dlinfo is not available in recent uClibc (>0.9.33),
but is available in older version of uClibc (<=0.9.33) whith a different prototype
than dlinfo() in glibc.

To be able to use LTTng UST with uClibc, we need to disable the Dynamic Linker
Tracing functionality [2].

A specific test on dlinfo() prototype is performed to enable or disable this
functionality.

This patch supersede the one added in abf58f46ce
that wrongly disable liblttng-ust-dl even if dlinfo() comme from glibc.

Fixes:
http://autobuild.buildroot.net/results/a6c/a6c33dd7ec2a36a50c5ea74b989a371d6c85e899/build-end.log

[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: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Romain Naour 2014-04-14 00:00:22 +02:00 committed by Thomas Petazzoni
parent f6bf71b7df
commit 51f5c91c09
1 changed files with 43 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
package/lttng-libust/lttng-libust-0001-Disable-liblttng-ust-dl-if-dlinfo-is-not-available.patch
View File

@ -1,17 +1,27 @@
Disable liblttng-ust-dl if dlinfo is not available in C library.
From 44316d0214425f5ae0d8af07099caae3e95ac890 Mon Sep 17 00:00:00 2001
From: Romain Naour <romain.naour@openwide.fr>
Date: Tue, 8 Apr 2014 22:15:27 +0200
Subject: [PATCH 1/1] 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].
According to uClibc commit [1], dlinfo is not available in recent uClibc (>0.9.33),
but is available in older version of uClibc (<=0.9.33) whith a different prototype
than dlinfo() in glibc.
To be able to use LTTng UST with uClibc, we need to disable the Dynamic Linker
Tracing functionality [2].
A specific test on dlinfo() prototype is performed to enable or disable this
functionality.
[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>
---
Makefile.am | 5 ++++-
configure.ac | 3 +++
2 files changed, 7 insertions(+), 1 deletion(-)
Makefile.am | 5 ++++-
configure.ac | 18 ++++++++++++++++++
2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/Makefile.am b/Makefile.am
index b79d2dd..c907ff1 100644
@ -34,19 +44,36 @@ index b79d2dd..c907ff1 100644
SUBDIRS += liblttng-ust-java liblttng-ust-jul
endif
diff --git a/configure.ac b/configure.ac
index f507883..5dcf0e2 100644
index b04d4e3..f4b499b 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])
@@ -119,8 +119,26 @@ AC_CHECK_LIB([dl], [dlopen],
AC_MSG_ERROR([Cannot find dlopen in libdl nor libc. Use [LDFLAGS]=-Ldir to specify their location.])
])
])
+AS_IF([test "$x$have_libdl" = "yes" || test "x$have_libc_dl" = "xyes"],
+ [AC_MSG_CHECKING([for dlinfo()])
+ # Ensure the check is covered by the LIBS variable
+ LIBS="$LIBS -ldl"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([[#define _GNU_SOURCE /* Required on Linux to get GNU extensions */
+ #include <dlfcn.h>]],
+ [[dlinfo(0, 0, 0);]])],
+ [AC_MSG_RESULT([yes])
+ dlinfo_ok=yes;
+ ],
+ [AC_MSG_RESULT([no])
+ AC_MSG_WARN([dlinfo() is not available, the Dynamic Linker Tracing functionality is disabled.])
+ dlinfo_ok=no;
+ ])
+ ],
+ [dlinfo_ok=no])
AM_CONDITIONAL([LTTNG_UST_BUILD_WITH_LIBDL], [test "x$have_libdl" = "xyes"])
AM_CONDITIONAL([LTTNG_UST_BUILD_WITH_LIBC_DL], [test "x$have_libc_dl" = "xyes"])
+AM_CONDITIONAL([HAVE_DLINFO], [test "dlinfo_ok" = "yes"])
+AC_CHECK_FUNCS([dlinfo])
+AM_CONDITIONAL([HAVE_DLINFO], [test "${ac_cv_func_dlinfo}" = "yes"])
+
CFLAGS="-Wall $CFLAGS"
AC_CHECK_LIB([pthread], [pthread_create])
# URCU
--
1.9.0