lttng-libust: requires dynamic library support

Fixes:
http://autobuild.buildroot.net/results/e89/e8974516173ea74c830b71e400fcbafdd69dea60/
http://autobuild.buildroot.net/results/cac/cac7015c3be7e34dbeaa6accb59aebebe68eb6d2/
http://autobuild.buildroot.net/results/4ce/4ce0a35316cd25536b58b50f096b6f75f6e3c1c9/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lttng-libust/Config.in

@@ -8,6 +8,7 @@ config BR2_PACKAGE_LTTNG_LIBUST
 	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_powerpc || BR2_x86_64
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_58854 # liburcu/gcc-4.8.x bug
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_STATIC_LIBS
 	help
 	  Userspace tracing library for the LTTng 2.x tracing
 	  infrastructure. It allows userspace programs to create
@@ -16,9 +17,9 @@ config BR2_PACKAGE_LTTNG_LIBUST
 
 	  http://lttng.org
 
-comment "lttng-libust needs a toolchain w/ wchar, threads"
+comment "lttng-libust needs a toolchain w/ dynamic library, wchar, threads"
 	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_powerpc || BR2_x86_64
-	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_STATIC_LIBS || !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_58854 # liburcu/gcc-4.8.x bug
 
 comment "lttng-libust needs a toolchain not affected by GCC bug 58854"