Android NDK：如何在Android.mk中动态获取编译器架构
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Android NDK: How to get compiler architecture in Android.mk dynamically
提问by LuxuryMaster
I'm trying to configure Android.mk to cross compile native code to support different chipset namely armeabi, mips, and x86. I know I can configure Application.mk in the following way to compile the source code for different chip set:
我正在尝试将 Android.mk 配置为交叉编译本机代码以支持不同的芯片组，即 armeabi、mips 和 x86。我知道我可以通过以下方式配置 Application.mk 来编译不同芯片组的源代码：
APP_ABI := all
This will trigger Android-NDK's build script to compile the source code for all the chipsets. However, I want to dynamically tell Android.mk to look for different static library dependencies compiled with different chip set.
这将触发 Android-NDK 的构建脚本来编译所有芯片组的源代码。但是，我想动态地告诉 Android.mk 查找使用不同芯片组编译的不同静态库依赖项。
# Get the architecture info
ARCH := ????
include $(CLEAR_VARS)
LOCAL_MODULE:= mylib
LOCAL_SRC_FILES:= build/lib/libxxx_$(ARCH).a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)
include $(PREBUILT_STATIC_LIBRARY)
Is this possible to do? If so, can anyone advice how to do so?
这是可能的吗？如果是这样，任何人都可以建议如何这样做吗？
Update: I tried something like this in Application.mk:
APP_ABI := armeabi armeabi-v7a mips x64with Android.mk:
# Get the architecture info ARCH := $(APP_ABI) include $(CLEAR_VARS) LOCAL_MODULE:= mylib LOCAL_SRC_FILES:= build/lib/libxxx_$(ARCH).a LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH) include $(PREBUILT_STATIC_LIBRARY)but it errors with the following:
The LOCAL_SRC_FILES for a prebuilt static library should only contain one itemwhich makes sense. I want to pass APP_ABI := all in Application.mk and be able to dynamically reference it. Any ideas?
更新：我在 Application.mk 中尝试过这样的事情：
APP_ABI := armeabi armeabi-v7a mips x64使用 Android.mk：
# Get the architecture info ARCH := $(APP_ABI) include $(CLEAR_VARS) LOCAL_MODULE:= mylib LOCAL_SRC_FILES:= build/lib/libxxx_$(ARCH).a LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH) include $(PREBUILT_STATIC_LIBRARY)但它出现以下错误：
The LOCAL_SRC_FILES for a prebuilt static library should only contain one item这是有道理的。我想在 Application.mk 中传递 APP_ABI := all 并能够动态引用它。有任何想法吗？
采纳答案by Sergey K.
There is TARGET_ARCHvariable that holds the value of the current ABI being built. You can use it the following way:
有一个TARGET_ARCH变量保存当前正在构建的 ABI 的值。您可以通过以下方式使用它：
ifeq ($(TARGET_ARCH),x86)
LOCAL_CFLAGS := $(COMMON_FLAGS_LIST)
else
LOCAL_CFLAGS := -mfpu=vfp -mfloat-abi=softfp $(COMMON_FLAGS_LIST)
endif
If you specify APP_ABI := armeabi-v7a armeabi mips x86or APP_ABI := allin your Application.mkyou will get each and every separate ABI value.
如果您指定APP_ABI := armeabi-v7a armeabi mips x86或APP_ABI := all在您Application.mk将获得每个单独的 ABI 值。
回答by nneonneo
Check TARGET_ARCH_ABI:
检查TARGET_ARCH_ABI：
ifeq($(TARGET_ARCH_ABI), armeabi-v7a)
# v7a-specific stuff
endif
