strace: add option for enabling stack trace support

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

package/devel/strace/Makefile

@@ -11,7 +11,7 @@ include $(INCLUDE_DIR)/kernel.mk
 PKG_NAME:=strace
 
 PKG_VERSION:=4.11
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_MD5SUM:=a15d2555a7febb56d00c6e1a51c655dc
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
@@ -23,6 +23,7 @@ PKG_LICENSE_FILES:=COPYRIGHT
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 
 PKG_FIXUP:=autoreconf
+PKG_CONFIG_DEPENDS:=CONFIG_PACKAGE_strace_libunwind
 PKG_INSTALL:=1
 
 include $(INCLUDE_DIR)/package.mk
@@ -39,6 +40,7 @@ define Package/strace
   SECTION:=utils
   CATEGORY:=Utilities
   TITLE:=System call tracer
+  DEPENDS:=+PACKAGE_strace_libunwind:libunwind
   URL:=http://strace.sourceforge.net/
 endef
 
@@ -47,6 +49,13 @@ A useful diagnostic, instructional, and debugging tool. Allows you to track what
 system calls a program makes while it is running.
 endef
 
+define Package/strace/config
+config PACKAGE_strace_libunwind
+	bool "Enable stack tracing support using libunwind (experimental)"
+	default n
+endef
+
+CONFIGURE_ARGS += --with-libunwind=$(if $(CONFIG_PACKAGE_strace_libunwind),yes,no)
 MAKE_FLAGS := \
 	CCOPT="$(TARGET_CFLAGS)"