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bionic/linker/Android.mk

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auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
Replace .S version of x86 crtfiles with .c version This patch replaces .S versions of x86 crtfiles with .c which are much easier to support. Some of the files are matching .c version of Arm crtfiles. x86 files required some cleanup anyway and this cleanup actually led to matching Arm files. I didn't change anything to share the same crt*.c between x86 and Arm. I prefer to keep them separate for a while in case any change is required for one of the arch, but it's good thing to do in the following patches. Change-Id: Ibcf033f8d15aa5b10c05c879fd4b79a64dfc70f3 Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
2012-11-28 15:31:14 +01:00
ifeq ($(TARGET_ARCH),x86)
linker_begin_extension := c
else
linker_begin_extension := S
endif
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
LOCAL_SRC_FILES:= \
Check for unknown flags passed to dlopen(3). Change-Id: I56f4aab0e5a1487bc32d2c4d231e8bd15c4ac8da
2012-12-19 00:57:55 +01:00
arch/$(TARGET_ARCH)/begin.$(linker_begin_extension) \
debugger.cpp \
dlfcn.cpp \
linker.cpp \
linker_environ.cpp \
linker_phdr.cpp \
rt.cpp
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
linker: add -Wl,--exclude-libs,ALL to LDFLAGS 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
2013-01-17 01:43:15 +01:00
LOCAL_LDFLAGS := -shared -Wl,--exclude-libs,ALL
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
linker: enable -fvisibility=hidden Compile the linker with -fvisibility=hidden. This reduces the number of symbols that show up in the .dynsym section of the linker. These symbols are never exported to other applications. In particular, this fixes a problem with setting -DLINKER_DEBUG=1 introduced in 468319ce4f3f7383d788b76c09cda2a405311f36. Because the symbols "debug_verbosity" and "format_log" have not been resolved before the linker links itself, any attempt to call PRINT / INFO / TRACE / WARN / ERROR will result in a segfault. This change allows the static linker to produce a relative reference to these symbols rather than relying on relocation. This also has a nice side effect of making the linker slightly smaller and slightly more optimized. The following symbols no longer in the .dynsym section of the linker after this change: -addr_to_name -call_constructors_recursi -calloc -debugger_init -debugger_signal_handler -debug_verbosity -dladdr -dlclose -dlerror -dl_lock -dlopen -dlsym -dl_unwind_find_exidx -find_containing_library -find_containing_symbol -find_library -format_buffer -free -libdl_info -linker_env_get -linker_env_init -linker_env_secure -linker_env_unset -linker_get_error -__linker_init -lookup -lookup_in_library -malloc -notify_gdb_of_libraries -notify_gdb_of_load -notify_gdb_of_unload -realloc -rtld_db_dlactivity -unload_library -vsnprintf Bug: 5827809 Change-Id: I5e8cd7dcf48c1d6831a970a67f63f24916c5e437
2012-04-04 19:18:27 +02:00
LOCAL_CFLAGS += -fno-stack-protector \
-Wstrict-overflow=5 \
Use std=gnu99 for the dynamic linker as well as libc. Change-Id: I76dd78576c5af6eb6282555f069647b6260edc31
2012-07-16 18:43:14 +02:00
-fvisibility=hidden \
Check for unknown flags passed to dlopen(3). Change-Id: I56f4aab0e5a1487bc32d2c4d231e8bd15c4ac8da
2012-12-19 00:57:55 +01:00
-Wall -Wextra -Werror
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
Clean up the linker a bit, remove prelinking support. Also make the errors more readable, since none of us seemed to know what they actually meant. The new style is still as verbose as the old, but that's probably necessary in the absence of chained exceptions in C. Here's what you'd see if you try to boot after removing libsurfaceflinger.so: 32267 32267 E AndroidRuntime: java.lang.UnsatisfiedLinkError: Cannot load library: (linker.c:1629, pid 32259) soinfo_link_image: could not load library "libsystem_server.so" needed by "libandroid_servers.so"; caused by (linker.c:1629, pid 32259) soinfo_link_image: could not load library "libsurfaceflinger.so" needed by "libsystem_server.so"; caused by (linker.c:709, pid 32259) load_library: library "libsurfaceflinger.so" not found This patch also fixes almost all of the compiler warnings. Change-Id: I64bb59aed6d4e039c15ea45be2367f319ef879f8
2012-08-04 01:49:39 +02:00
# We need to access Bionic private headers in the linker...
LOCAL_CFLAGS += -I$(LOCAL_PATH)/../libc/
# ...one of which is <private/bionic_tls.h>, for which we
# need HAVE_ARM_TLS_REGISTER.
Use correct TLS codepath for linker Replicate ARM libc build's HAVE_ARM_TLS_REGISTER preprocessor definition logic, to ensure that the runtime linker uses the correct codepath for accessing the TLS address
2009-09-30 01:12:31 +02:00
ifeq ($(TARGET_ARCH)-$(ARCH_ARM_HAVE_TLS_REGISTER),arm-true)
LOCAL_CFLAGS += -DHAVE_ARM_TLS_REGISTER
endif
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
ifeq ($(TARGET_ARCH),arm)
MIPS support to the linker Change-Id: I37ec2d6c51d82bb9e9dbfef4b38c85366bead255 Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Raghu Gandham <raghu@mips.com> Signed-off-by: Bhanu Chetlapalli <bhanu@mips.com>
2012-07-31 21:07:22 +02:00
LOCAL_CFLAGS += -DANDROID_ARM_LINKER
endif
ifeq ($(TARGET_ARCH),x86)
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
LOCAL_CFLAGS += -DANDROID_X86_LINKER
MIPS support to the linker Change-Id: I37ec2d6c51d82bb9e9dbfef4b38c85366bead255 Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Raghu Gandham <raghu@mips.com> Signed-off-by: Bhanu Chetlapalli <bhanu@mips.com>
2012-07-31 21:07:22 +02:00
endif
ifeq ($(TARGET_ARCH),mips)
LOCAL_CFLAGS += -DANDROID_MIPS_LINKER
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
endif
LOCAL_MODULE:= linker
Add dependencies on all the makefiles. This should help prevent broken builds next time I'm messing with assembler/compiler/linker flags... Change-Id: I30f15a3ce3c3f3c60cad7bc59aaba9f42d792224
2012-08-13 23:06:05 +02:00
LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
linker: remove libcutils dependency by re-implementing simpler socket_local_client. Change-Id: I87f29fd59454d713b9ddfb13e6cf114822f52efd
2010-06-11 03:29:33 +02:00
LOCAL_STATIC_LIBRARIES := libc_nomalloc
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
#LOCAL_FORCE_STATIC_EXECUTABLE := true # not necessary when not including BUILD_EXECUTABLE
#
# include $(BUILD_EXECUTABLE)
#
# Instead of including $(BUILD_EXECUTABLE), we execute the steps to create an executable by
# hand, as we want to insert an extra step that is not supported by the build system, and
# is probably specific the linker only, so there's no need to modify the build system for
# the purpose.
LOCAL_MODULE_CLASS := EXECUTABLES
LOCAL_MODULE_SUFFIX := $(TARGET_EXECUTABLE_SUFFIX)
linker: set LOCAL_NO_CRT := true Use LOCAL_NO_CRT to prevent linking against crtbegin.o, rather than messing with build rules. This also prevents linking against crtend.o, which isn't needed for the linker. Change-Id: I0c5b9999be7e8676560fe145c1c033ffce8db4d1
2011-11-04 18:11:26 +01:00
# we don't want crtbegin.o (because we have begin.o), so unset it
# just for this module
LOCAL_NO_CRT := true
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
Split out LOCAL_ASFLAGS. Bug: 6967574 Change-Id: I5be50d582c1cb8075039b06292cf0745a996c3c4
2012-08-11 23:23:19 +02:00
# TODO: split out the asflags.
LOCAL_ASFLAGS := $(LOCAL_CFLAGS)
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
include $(BUILD_SYSTEM)/dynamic_binary.mk
Set up the private variables. Now we use private variables in transform-o-to-executable to support build executables against the NDK. Bug: 7170098 Change-Id: I6e505b33001b76f4b11fcbbb1d35392c4ddf4c70
2012-09-26 03:32:24 +02:00
# See build/core/executable.mk
$(linked_module): PRIVATE_TARGET_GLOBAL_LD_DIRS := $(TARGET_GLOBAL_LD_DIRS)
$(linked_module): PRIVATE_TARGET_GLOBAL_LDFLAGS := $(TARGET_GLOBAL_LDFLAGS)
$(linked_module): PRIVATE_TARGET_FDO_LIB := $(TARGET_FDO_LIB)
$(linked_module): PRIVATE_TARGET_LIBGCC := $(TARGET_LIBGCC)
$(linked_module): PRIVATE_TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_CRTBEGIN_DYNAMIC_O)
$(linked_module): PRIVATE_TARGET_CRTBEGIN_STATIC_O := $(TARGET_CRTBEGIN_STATIC_O)
$(linked_module): PRIVATE_TARGET_CRTEND_O := $(TARGET_CRTEND_O)
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
$(linked_module): $(TARGET_CRTBEGIN_STATIC_O) $(all_objects) $(all_libraries) $(TARGET_CRTEND_O)
$(transform-o-to-static-executable)
@echo "target PrefixSymbols: $(PRIVATE_MODULE) ($@)"
$(hide) $(TARGET_OBJCOPY) --prefix-symbols=__dl_ $@
#
# end of BUILD_EXECUTABLE hack
#
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