d89ce40d8e
The linker is essentially a shared library, and incorporates it's own copy of libc. Even though it's unnecessary, currently /system/bin/linker is exporting various libc symbols (only to apps which explicitly dlopen /system/bin/linker) Add --exclude-libs,ALL, which tells the static linker to mark all of the imported libc symbols as hidden. This reduces the size of /system/bin/linker from 92K to 67K with no obvious loss in functionality. $ adb shell ls -l /system/bin/linker -rwxrwxrwx root root 92260 2013-01-16 16:52 linker $ adb shell ls -l /system/bin/linker -rwxrwxrwx root root 67660 2013-01-16 16:49 linker Documentation on exclude-libs can be found at http://sourceware.org/binutils/docs-2.21/ld/Options.html Change-Id: I4508287770e4b7a845def2e6b4af969f9c866c6a
88 lines
2.6 KiB
Makefile
88 lines
2.6 KiB
Makefile
LOCAL_PATH:= $(call my-dir)
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include $(CLEAR_VARS)
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ifeq ($(TARGET_ARCH),x86)
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linker_begin_extension := c
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else
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linker_begin_extension := S
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endif
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LOCAL_SRC_FILES:= \
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arch/$(TARGET_ARCH)/begin.$(linker_begin_extension) \
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debugger.cpp \
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dlfcn.cpp \
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linker.cpp \
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linker_environ.cpp \
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linker_format.cpp \
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linker_phdr.cpp \
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rt.cpp
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LOCAL_LDFLAGS := -shared -Wl,--exclude-libs,ALL
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LOCAL_CFLAGS += -fno-stack-protector \
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-Wstrict-overflow=5 \
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-fvisibility=hidden \
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-Wall -Wextra -Werror
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# We need to access Bionic private headers in the linker...
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LOCAL_CFLAGS += -I$(LOCAL_PATH)/../libc/
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# ...one of which is <private/bionic_tls.h>, for which we
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# need HAVE_ARM_TLS_REGISTER.
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ifeq ($(TARGET_ARCH)-$(ARCH_ARM_HAVE_TLS_REGISTER),arm-true)
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LOCAL_CFLAGS += -DHAVE_ARM_TLS_REGISTER
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endif
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ifeq ($(TARGET_ARCH),arm)
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LOCAL_CFLAGS += -DANDROID_ARM_LINKER
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endif
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ifeq ($(TARGET_ARCH),x86)
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LOCAL_CFLAGS += -DANDROID_X86_LINKER
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endif
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ifeq ($(TARGET_ARCH),mips)
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LOCAL_CFLAGS += -DANDROID_MIPS_LINKER
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endif
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LOCAL_MODULE:= linker
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LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
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LOCAL_STATIC_LIBRARIES := libc_nomalloc
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#LOCAL_FORCE_STATIC_EXECUTABLE := true # not necessary when not including BUILD_EXECUTABLE
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#
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# include $(BUILD_EXECUTABLE)
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#
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# Instead of including $(BUILD_EXECUTABLE), we execute the steps to create an executable by
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# hand, as we want to insert an extra step that is not supported by the build system, and
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# is probably specific the linker only, so there's no need to modify the build system for
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# the purpose.
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LOCAL_MODULE_CLASS := EXECUTABLES
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LOCAL_MODULE_SUFFIX := $(TARGET_EXECUTABLE_SUFFIX)
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# we don't want crtbegin.o (because we have begin.o), so unset it
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# just for this module
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LOCAL_NO_CRT := true
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include $(BUILD_SYSTEM)/dynamic_binary.mk
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# See build/core/executable.mk
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$(linked_module): PRIVATE_TARGET_GLOBAL_LD_DIRS := $(TARGET_GLOBAL_LD_DIRS)
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$(linked_module): PRIVATE_TARGET_GLOBAL_LDFLAGS := $(TARGET_GLOBAL_LDFLAGS)
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$(linked_module): PRIVATE_TARGET_FDO_LIB := $(TARGET_FDO_LIB)
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$(linked_module): PRIVATE_TARGET_LIBGCC := $(TARGET_LIBGCC)
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$(linked_module): PRIVATE_TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_CRTBEGIN_DYNAMIC_O)
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$(linked_module): PRIVATE_TARGET_CRTBEGIN_STATIC_O := $(TARGET_CRTBEGIN_STATIC_O)
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$(linked_module): PRIVATE_TARGET_CRTEND_O := $(TARGET_CRTEND_O)
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$(linked_module): $(TARGET_CRTBEGIN_STATIC_O) $(all_objects) $(all_libraries) $(TARGET_CRTEND_O)
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$(transform-o-to-static-executable)
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@echo "target PrefixSymbols: $(PRIVATE_MODULE) ($@)"
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$(hide) $(TARGET_OBJCOPY) --prefix-symbols=__dl_ $@
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#
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# end of BUILD_EXECUTABLE hack
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#
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