Switch to libsigchain.a

 Use LOCAL_WHOLE_STATIC_LIBRARIES to instruct static linker
 to export symbols from the static library.

Change-Id: I465806dcffc777a682523f74ae6f7ab61aaa6962
diff --git a/cmds/app_process/Android.mk b/cmds/app_process/Android.mk
index 1ca14a6..397a7d1 100644
--- a/cmds/app_process/Android.mk
+++ b/cmds/app_process/Android.mk
@@ -2,15 +2,10 @@
 
 include $(CLEAR_VARS)
 
-# TODO: Trying to link libsigchain as a static library prevents
-# static linker from exporting necessary symbols. So as a workaround
-# we use sigchain.o
 LOCAL_SRC_FILES:= \
-	app_main.cpp \
-	sigchain_proxy.cpp
+	app_main.cpp
 
 LOCAL_LDFLAGS := -Wl,--version-script,art/sigchainlib/version-script.txt -Wl,--export-dynamic
-LOCAL_CPPFLAGS := -std=c++11 -Iart
 
 LOCAL_SHARED_LIBRARIES := \
 	libdl \
@@ -20,6 +15,8 @@
 	libbinder \
 	libandroid_runtime
 
+LOCAL_WHOLE_STATIC_LIBRARIES := libsigchain
+
 LOCAL_MODULE:= app_process
 LOCAL_MULTILIB := both
 LOCAL_MODULE_STEM_32 := app_process32
@@ -36,10 +33,8 @@
 
 include $(CLEAR_VARS)
 
-# see comment above (~l5)
 LOCAL_SRC_FILES:= \
-	app_main.cpp \
-	sigchain_proxy.cpp
+	app_main.cpp
 
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \
@@ -48,8 +43,10 @@
 	libbinder \
 	libandroid_runtime
 
+LOCAL_WHOLE_STATIC_LIBRARIES := libsigchain
+
 LOCAL_LDFLAGS := -ldl -Wl,--version-script,art/sigchainlib/version-script.txt -Wl,--export-dynamic
-LOCAL_CPPFLAGS := -std=c++11 -Iart
+LOCAL_CPPFLAGS := -std=c++11
 
 LOCAL_MODULE := app_process__asan
 LOCAL_MODULE_TAGS := eng