"Android Local Development technology: compiling Scripts" application.mk

Guo Xiaoxing
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The role and characteristics of a application.mk file

Function: Describes the modules (static or dynamic) that are required in the application.

Location: Application.mk usually placed in P ROJ E C T /JNI/APPLICaTIo.mk, Project refers to the path to the item.

Variable 2.1 app_project_path for two application.mk files

A required variable, and gives an absolute path to the root directory of the application project.

2.2 App_modules

Optional variable, if not defined, the module name is defined in the local_module of the Android.mk file, The NDK is compiled with the default module declared in Android.mk and contains all the sub-files (makefile files), and the NDK automatically calculates the module dependencies. If defined, it must be a space-delimited list of modules.

2.3 App_optm

Optional variable, used to define release or debug, can be used to change the priority when compiling the application module. The release mode is default and generates highly optimized binary code. Debug mode generates binary code that is not optimized, can detect many bugs, and can be debugged.

Note : You can debug release and debug binaries, but release builds tend to provide less information in debug reply, some variables are optimized and cannot be detected, code reordering can make code stepping difficult, and stack traces may not be reliable.

2.4 App_cflags

A set of C compiler switches that are passed when compiling any C or C + + source code for any module. It can be used to change the build of a module that a given application needs to rely on, rather than modifying its own android.mk file.

2.5 App_build_script

By default, the NDK build system will (AP Pp ROJ E C TP AT H )/JNIunderFindFindaanameto beANd RoId .mkof thetextpieces. that,theinitatextpieces (App_project_path)/jni/android.mk
If you want to reload this behavior, you can define app_build_script to point to a different build script. A non-absolute path will always be resolved to a path relative to the NDK top-level directory.

2.6 App_abi

By default, the NDK's compilation system generates machine code based on the "Armeabi" ABI. You can use App_abi to select a different ABI.

Example

Hardware FPU instructions are supported on ARMV7 devices. You can use the App_abi: = armeabi-v7 support IA-32 instruction set, you can use App_abi: = x86 support These three kinds, you can use App_abi: = Armeabi armeabi-v7a x86.

2.7 App_stl

By default, the NDK build system provides a C + + header file for the smallest C + + Runtime library (/system/lib/libstdc++.so) given by the Android system. However, the NDK comes with another C + + implementation that you can use or link to in your own application. Define APP_STL to make the following choices:

APP_STL := stlport_static         staticlibraryAPP_STL := stlport_shared       libraryAPP_STL := system                    defaultlibrary

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Android Local Development technology: Compile script application.mk