build: hide layer symbols in android build

Hide symbols from layers that don't need to be exported.
This makes libraries smaller.
It reduces symbol lookup time and call overhead.
It prevents possible symbol collisions.

diff --git a/build-android/jni/Android.mk b/build-android/jni/Android.mk
index 363b80e..ef793fd 100644 (file)
--- a/build-android/jni/Android.mk
+++ b/build-android/jni/Android.mk
@@ -25,7 +25,7 @@ LOCAL_SRC_FILES += $(LAYER_DIR)/common/vk_layer_utils.cpp
 LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(SRC_DIR)/layers \
                     $(SRC_DIR)/loader
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -41,9 +41,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(SRC_DIR)/external/glslang \
                     $(SRC_DIR)/external/spirv-tools/include
 LOCAL_STATIC_LIBRARIES += layer_utils SPIRV-Tools-prebuilt
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 LOCAL_LDLIBS    := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -55,9 +56,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(LAYER_DIR)/include \
                     $(SRC_DIR)/loader
 LOCAL_STATIC_LIBRARIES += layer_utils
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 LOCAL_LDLIBS    := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -69,9 +71,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(SRC_DIR)/layers \
                     $(SRC_DIR)/loader
 LOCAL_STATIC_LIBRARIES += layer_utils
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 LOCAL_LDLIBS    := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -83,9 +86,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(LAYER_DIR)/include \
                     $(SRC_DIR)/loader
 LOCAL_STATIC_LIBRARIES += layer_utils
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 LOCAL_LDLIBS    := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -97,9 +101,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(LAYER_DIR)/include \
                     $(SRC_DIR)/loader
 LOCAL_STATIC_LIBRARIES += layer_utils
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 LOCAL_LDLIBS    := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -112,9 +117,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(LAYER_DIR)/include \
                     $(SRC_DIR)/loader
 LOCAL_STATIC_LIBRARIES += layer_utils
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 LOCAL_LDLIBS    := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -126,9 +132,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
                     $(LAYER_DIR)/include \
                     $(SRC_DIR)/loader
 LOCAL_STATIC_LIBRARIES += layer_utils
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden
 LOCAL_LDLIBS    := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_SHARED_LIBRARY)
 
 # Pull in prebuilt shaderc
@@ -188,9 +195,10 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
 
 LOCAL_STATIC_LIBRARIES := googletest_main layer_utils
 LOCAL_SHARED_LIBRARIES += shaderc-prebuilt glslang-prebuilt OGLCompiler-prebuilt OSDependent-prebuilt HLSL-prebuilt shaderc_util-prebuilt SPIRV-prebuilt SPIRV-Tools-prebuilt
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR --include=$(SRC_DIR)/common/vulkan_wrapper.h
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden --include=$(SRC_DIR)/common/vulkan_wrapper.h
 LOCAL_LDLIBS := -llog
 LOCAL_LDFLAGS   += -Wl,-Bsymbolic
+LOCAL_LDFLAGS   += -Wl,--exclude-libs,ALL
 include $(BUILD_EXECUTABLE)
 
 # Note: The following module is similar in name to the executable, but differs so that loader won't enumerate the resulting .so
@@ -210,7 +218,7 @@ LOCAL_C_INCLUDES += $(SRC_DIR)/include \
 
 LOCAL_STATIC_LIBRARIES := googletest_main layer_utils
 LOCAL_SHARED_LIBRARIES += shaderc-prebuilt glslang-prebuilt OGLCompiler-prebuilt OSDependent-prebuilt HLSL-prebuilt shaderc_util-prebuilt SPIRV-prebuilt SPIRV-Tools-prebuilt
-LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -DVALIDATION_APK --include=$(SRC_DIR)/common/vulkan_wrapper.h
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR -fvisibility=hidden -DVALIDATION_APK --include=$(SRC_DIR)/common/vulkan_wrapper.h
 LOCAL_WHOLE_STATIC_LIBRARIES += android_native_app_glue
 LOCAL_LDLIBS := -llog -landroid
 include $(BUILD_SHARED_LIBRARY)