1dbeeca5c4
The main idea is that libgcc.a should appear after object files and static libraries but before depending shared libraries. This willl force the linker to copy the libgcc.a functions required by the generated library into the target binary, instead of relying on what's available in libc.so and others. This ensures maximum portability, and prevent problems in the future when we change the toolchain, which translates to different libgcc.a functions embedded in libc.so and other exposed native libraries. However, this will make also generated shared libraries bigger, because the compiler insists on generating code that depends on a bunch of C++ support functions (even when building from C sources). An increase of about 8KB per shared library is expected.
134 lines
4.3 KiB
Makefile
134 lines
4.3 KiB
Makefile
# Copyright (C) 2009 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# this file is used to prepare the NDK to build with the arm-eabi-4.2.1
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# toolchain any number of source files
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#
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# its purpose is to define (or re-define) templates used to build
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# various sources into target object files, libraries or executables.
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#
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# Note that this file may end up being parsed several times in future
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# revisions of the NDK.
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#
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TOOLCHAIN_NAME := arm-eabi-4.2.1
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TOOLCHAIN_PREFIX := $(HOST_PREBUILT)/$(TOOLCHAIN_NAME)/bin/arm-eabi-
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TARGET_CFLAGS.common := \
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-I$(SYSROOT)/usr/include \
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-march=armv5te -mtune=xscale \
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-msoft-float -fpic \
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-mthumb-interwork \
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-ffunction-sections \
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-funwind-tables \
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-fstack-protector \
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-fno-short-enums \
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-D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ \
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-D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ \
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TARGET_arm_release_CFLAGS := -O2 \
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-fomit-frame-pointer \
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-fstrict-aliasing \
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-funswitch-loops \
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-finline-limit=300
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TARGET_thumb_release_CFLAGS := -mthumb \
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-Os \
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-fomit-frame-pointer \
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-fno-strict-aliasing \
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-finline-limit=64
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# When building for debug, compile everything as arm.
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TARGET_arm_debug_CFLAGS := $(TARGET_arm_release_CFLAGS) \
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-fno-omit-frame-pointer \
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-fno-strict-aliasing
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TARGET_thumb_debug_CFLAGS := $(TARGET_thumb_release_CFLAGS) \
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-marm \
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-fno-omit-frame-pointer
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TARGET_CC := $(TOOLCHAIN_PREFIX)gcc
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TARGET_CFLAGS := $(TARGET_CFLAGS.common)
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TARGET_CXX := $(TOOLCHAIN_PREFIX)g++
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TARGET_CXXFLAGS := $(TARGET_CFLAGS.common) -fno-exceptions -fno-rtti
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TARGET_LD := $(TOOLCHAIN_PREFIX)ld
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TARGET_LDFLAGS :=
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TARGET_AR := $(TOOLCHAIN_PREFIX)ar
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TARGET_ARFLAGS := crs
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TARGET_LIBGCC := $(shell $(TARGET_CC) -mthumb-interwork -print-libgcc-file-name)
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TARGET_LDLIBS := -Wl,-rpath-link=$(SYSROOT)/usr/lib
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# These flags are used to ensure that a binary doesn't reference undefined
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# flags.
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TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
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# The ABI-specific sub-directory that the SDK tools recognize for
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# this toolchain's generated binaries
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TARGET_ABI_SUBDIR := armeabi
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# NOTE: Ensure that TARGET_LIBGCC is placed after all private objects
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# and static libraries, but before any other library in the link
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# command line when generating shared libraries and executables.
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#
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# This ensures that all libgcc.a functions required by the target
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# will be included into it, instead of relying on what's available
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# on other libraries like libc.so, which may change between system
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# releases due to toolchain or library changes.
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#
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define cmd-build-shared-library
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$(TARGET_CC) \
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-nostdlib -Wl,-soname,$(notdir $@) \
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-Wl,-shared,-Bsymbolic \
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$(PRIVATE_OBJECTS) \
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-Wl,--whole-archive \
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$(PRIVATE_WHOLE_STATIC_LIBRARIES) \
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-Wl,--no-whole-archive \
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$(PRIVATE_STATIC_LIBRARIES) \
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$(TARGET_LIBGCC) \
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$(PRIVATE_SHARED_LIBRARIES) \
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$(PRIVATE_LDFLAGS) \
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$(PRIVATE_LDLIBS) \
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-o $@
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endef
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define cmd-build-executable
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$(TARGET_CC) \
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-nostdlib -Bdynamic \
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-Wl,-dynamic-linker,/system/bin/linker \
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-Wl,--gc-sections \
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-Wl,-z,nocopyreloc \
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$(TARGET_CRTBEGIN_DYNAMIC_O) \
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$(PRIVATE_OBJECTS) \
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$(PRIVATE_STATIC_LIBRARIES) \
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$(TARGET_LIBGCC) \
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$(PRIVATE_SHARED_LIBRARIES) \
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$(PRIVATE_LDFLAGS) \
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$(PRIVATE_LDLIBS) \
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$(TARGET_CRTEND_O) \
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-o $@
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endef
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define cmd-build-static-library
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$(TARGET_AR) $(TARGET_ARFLAGS) $@ $(PRIVATE_OBJECTS)
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endef
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cmd-strip = $(TOOLCHAIN_PREFIX)strip --strip-debug $1
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