[Buildroot] [PATCH] lttng-tools: needs glibc

[Baruch Siach]

This commit partially reverts commit a6bb295642919 (lttng-tools: update
to 2.9.5) that enabled lttng-tools for uClibc and musl. Upstream code
does not detect dlmopen() specifically. configure only checks which
library defines dlopen(), and fails the configuration when none is
found. The code of the prog.c test still relies on dlmopen() GNU
extension that uClibc and musl do not implement currently.

Fixes:
http://autobuild.buildroot.net/results/add/add97b4b3f45841249f239367452205c38d4e4df/
http://autobuild.buildroot.net/results/382/3825c88bb8a23708e4c2fed99f2417555078c65a/
http://autobuild.buildroot.net/results/4ae/4aef36977f039a1533b409a7c172f0ceaa2c6088/

Cc: Waldemar Brodkorb <wbx at openadk.org>
Cc: Philippe Proulx <eeppeliteloop at gmail.com>
Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
 package/lttng-tools/Config.in | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/package/lttng-tools/Config.in b/package/lttng-tools/Config.in
index 9c86cc264643..b84f201c2a22 100644
--- a/package/lttng-tools/Config.in
+++ b/package/lttng-tools/Config.in
@@ -4,6 +4,8 @@ config BR2_PACKAGE_LTTNG_TOOLS
 	depends on BR2_PACKAGE_LIBURCU_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_STATIC_LIBS # uses dlfcn
+	# uclibc/musl don't implement dlmopen()/LM_ID_BASE
+	depends on BR2_TOOLCHAIN_USES_GLIBC
 	select BR2_PACKAGE_LIBURCU
 	select BR2_PACKAGE_LIBXML2
 	select BR2_PACKAGE_POPT
@@ -27,6 +29,7 @@ config BR2_PACKAGE_LTTNG_TOOLS
 
 	  http://lttng.org
 
-comment "lttng-tools needs a toolchain w/ threads, dynamic library"
+comment "lttng-tools needs a glibc toolchain w/ threads, dynamic library"
 	depends on BR2_PACKAGE_LIBURCU_ARCH_SUPPORTS
-	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS || \
+		!BR2_TOOLCHAIN_USES_GLIBC
-- 
2.14.1