package/opentracing-cpp: needs dynamic library support

opentracing-cpp requires dlfcn.h from src/dynamic_load_unix.cpp.
This file is compiled unconditionally.

Disable opentracing-cpp on BR2_STATIC_LIBS configurations.

Fixes: http://autobuild.buildroot.net/results/454173aef9ff7c808294a974088d7682cad240a8/

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/opentracing-cpp/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_OPENTRACING_CPP
 	bool "opentracing-cpp"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_STATIC_LIBS
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # exception_ptr
 	help
@@ -9,8 +10,9 @@ config BR2_PACKAGE_OPENTRACING_CPP
 
 	  http://opentracing.io
 
-comment "opentracing-cpp needs a toolchain w/ C++, threads, gcc >= 4.8"
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
+comment "opentracing-cpp needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.8"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
+		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 
 comment "opentracing-cpp needs exception_ptr"
 	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735