Cross Compile C/C++ using arm-eabi-gcc/g++( provide by Android) Directly

上一篇有提到我們可以使用agcc來幫我們解決Include header及Linking Library的問題。但因為他已經預設加入一些額外的編譯參數例如-march=armv5te等等，要一個個修改也頗煩不如直接寫個別project寫一個Makefile。因此參考agcc的方式下面show出我的Makefile的code。
P.S. 如同上一篇，在使用前必須要先Build Android來產生相關的Library

CPP = arm-eabi-g++
CC = arm-eabi-gcc
PRODUCT = cardhu
Android_PATH = /opt/compal/android/15r1
NAME = matrix_mal
CFLAG = -I$(Android_PATH)/system/core/include \
        -I$(Android_PATH)/hardware/libhardware/include \
        -I$(Android_PATH)/hardware/ril/include \
        -I$(Android_PATH)/dalvik/libnativehelper/include\
        -I$(Android_PATH)/frameworks/base/include \
        -I$(Android_PATH)/external/skia/include \
        -I$(Android_PATH)/out/target/product/$(PRODUCT)/obj/include\
        -I$(Android_PATH)/bionic/libc/arch-arm/include\
        -I$(Android_PATH)/bionic/libc/include \
        -I$(Android_PATH)/bionic/libstdc++/include\
        -I$(Android_PATH)/bionic/libc/kernel/common\
        -I$(Android_PATH)/bionic/libc/kernel/arch-arm\
        -I$(Android_PATH)/bionic/libm/include \
        -I$(Android_PATH)/bionic/libm/include/arch/arm \
        -I$(Android_PATH)/bionic/libthread_db/include\
        -I$(Android_PATH)/bionic/libm/arm\
        -I$(Android_PATH)/bionic/libm\
        -I$(Android_PATH)/out/target/product/$(PRODUCT)/obj/SHARED_LIBRARIES/libm_intermediates\
        -include $(Android_PATH)/system/core/include/arch/linux-arm/AndroidConfig.h

LDFLAGS = -mthumb-interwork -fpic -fno-exceptions -ffunction-sections \
        -funwind-tables -fstack-protector\
         -fmessage-length=0 -Bdynamic -Wl,-T,$(Android_PATH)/build/core/armelf.x\
         -Wl,-dynamic-linker,/system/bin/linker -Wl,--gc-sections -Wl,-z,nocopyreloc \
         -Wl,--no-undefined -Wl,-rpath-link=$(Android_PATH)/out/target/product/$(PRODUCT)/obj/lib \
         -L$(Android_PATH)/out/target/product/$(PRODUCT)/obj/lib \
         -nostdlib $(Android_PATH)/out/target/product/$(PRODUCT)/obj/lib/crtend_android.o \
         $(Android_PATH)/out/target/product/$(PRODUCT)/obj/lib/crtbegin_dynamic.o \
         $(Android_PATH)/prebuilt/darwin-x86/toolchain/arm-eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/libgcc.a\
         -lc -lm
                  
IGNORE = -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__\
         -DANDROID -DSK_RELEASE -DNDEBUG  -UDEBUG -march=armv5te -mtune=xscale\
         -msoft-float -mfloat-abi=hard


all:
    $(CPP) $(LDFLAGS) $(CFLAG) -o $(NAME) matrix_mal.cpp

要套用到自己的project只需修改

1. Line 3: Android編譯的Product，例如如果是模擬器就把PRODUCT改成generic 
2. Line 4: 修改Android Source Code的位置 Android_PATH
3. Line 5: Binary的名字 NAME
4. Line 40: Source Code的名字，替換matrix_mal.cpp
5. Line 40如果是要編譯C code的話，將 CPP改成CC

另外，如果在編譯的時候想加入額外的參數，可以:

$ make CFLAG+="額外的參數"

或是如果想要指定binary的名稱，可以:

$ make NAME="名稱"