Android 编译 C 库

标准的做法是把 src 放到 /android/develop/ 目录下去，然后建立 Android.mk 文件，

然后 make modue ...., 但是，这种方式太麻烦。

下面介绍一种方法，可以比较快速的编译 C 库，

和上一篇中一样，首先要设置自己的环境变量：

cat setenv.sh

export PATH=$PATH:/android/myandroid/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/bin
export CROSS_COMPILER=arm-eabi
export TARGET=1
export ANDDROID=1
export A=/android/mydroid/

然后依然是建立一个 mk 文件：

cat zconfiglib.mk

ifdef ANDDROID
Abionic=$(A)bionic/libc/
AoutLib=$(A)out/target/product/teton_ebook/obj/lib/
CFLAGS += -I $(A)bionic/libc/arch-arm/include -I $(A)bionic/libc/include -I $(A)bionic/libc/kernel/common -I $(A)bionic/libc/kernel/arch-arm -c -fno-exceptions -Wno-multichar -march=armv5te -mtune=xscale -msoft-float -fpic -mthumb-interwork -ffunction-sections -funwind-tables /
-fstack-protector -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ /
-include $(A)system/core/include/arch/linux-arm/AndroidConfig.h -DANDROID -fmessage-length=0 -W -Wall -Wno-unused -DSK_RELEASE -DNDEBUG /
-O2 -Wstrict-aliasing=2 -finline-functions -fno-inline-functions-called-once -fgcse-after-reload -frerun-cse-after-loop /
-frename-registers -DNDEBUG -UDEBUG -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -MD

LIBS += -nostdlib -Wl,-soname, -Wl,-T,$(A)build/core/armelf.xsc -Wl,--gc-sections -Wl,-Bsymbolic -L$(AoutLib) -Wl,--whole-archive -Wl,--no-whole-archive -lc -lm -Wl,--no-undefined $(A)/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/interwork/libgcc.a

然后是你自己的 lib 的 makefile.

cat makefile

ifdef TARGET
include /zconfiglib.mk
CROSS=$(CROSS_COMPILER)-
CC=$(CROSS)gcc
AR=$(CROSS)ar
LD=$(CROSS)ld
else
CC = gcc
AR = ar
LD = ld
STRIP = strip
endif

INCLUDE+= -I../ -I./

LIBS+= -shared

OBJ_DIR = obj/
OBJECTS = $(OBJ_DIR)hello.o
TARGET_OUTPUT=./libhello

CFLAGS +=
all: $(TARGET_OUTPUT) $(TEST_OUTPUT) $(OBJECTS)

$(OBJ_DIR)%.o: %.c
@-mkdir -p $(OBJ_DIR)
$(CC) $(INCLUDE) $(CFLAGS) -c $< -o $@

$(TARGET_OUTPUT): $(OBJECTS)
$(CC) $(LIBS) -o $(TARGET_OUTPUT) $(OBJECTS) $(LD_PATH)
@echo "make $@ finished on `date`"
clean:
@rm -f $(TARGET_OUTPUT)
@rm -rf obj

然后 make 就可以了。

编译出来的库貌似需要放到 /system/lib 下去。

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