Android编译中m、mm、mmm的区别

准备工作

在AndroidSource Code中有envsetup.sh档案，当执行过此档案后，可以大幅将build的过程简单化、自动化

此档案在src(android source code 位置)/build/中

所以可以执行以下指令

cd /src/build/
. envsetup.sh

可以使用help来检示有哪些指令可以使用

    Invoke ". build/envsetup.sh" from your shell to add thefollowing functions to your environment:  
 
    - croot:   Changes directory to the top of the tree.
    - m:       Makesfrom the top of the tree.
    - mm:      Builds all of the modules in the currentdirectory.
    - mmm:     Builds all of the modules in the supplieddirectories.
    - cgrep:   Greps on all local C/C++ files.
    - hgrep:   Greps on all local C/C++ header files.
    - jgrep:   Greps on all local Java files.
    - mkgrep:  Greps on all local make files.
    - rcgrep:  Greps on all local .rc files.
    - resgrep: Greps on all local res/*.xml files.
    - shgrep:  Greps on all local .sh files.
    - godir:   Go to the directory containing a file.   

其中对模块的编译有辅助说明的是tapas、m、mm、mmm这几个指令。

m越多，编译范围越小。

m 编译全部的模块

root@ubuntu:/home/android/src# m  

mm 编译模块目录

    root@ubuntu:/home/android/src/external/jpeg# mm
    ============================================
    PLATFORM_VERSION_CODENAME=REL
    PLATFORM_VERSION=2.1-update1
    TARGET_PRODUCT=generic
    TARGET_BUILD_VARIANT=eng
    TARGET_SIMULATOR=false
    TARGET_BUILD_TYPE=release
    TARGET_ARCH=arm
    HOST_ARCH=x86
    HOST_OS=linux
    HOST_BUILD_TYPE=release
    BUILD_ID=ECLAIR
    ============================================
    make: Entering directory `/home/android/src'
    Copy: out/target/product/generic/system/etc/apns-conf.xml
    make: Leaving directory `/home/android/src'
    root@ubuntu:/home/android/src/external/jpeg#  

单独编译某模块，需要在mmm后面指定模块路径

    root@ubuntu:/home/android/src# mmm external/jpeg/
    ============================================
    PLATFORM_VERSION_CODENAME=REL
    PLATFORM_VERSION=2.1-update1
    TARGET_PRODUCT=generic
    TARGET_BUILD_VARIANT=eng
    TARGET_SIMULATOR=
    TARGET_BUILD_TYPE=release
    TARGET_ARCH=arm
    HOST_ARCH=x86
    HOST_OS=linux
    HOST_BUILD_TYPE=release
    BUILD_ID=ECLAIR
    ============================================
    make: Entering directory `/home/android/src'
    Target buildinfo: out/target/product/generic/root/default.prop
    Target buildinfo: out/target/product/generic/system/build.prop
    Copy: out/target/product/generic/system/etc/apns-conf.xml
    make: Leaving directory `/home/android/src'
    root@ubuntu:/home/android/src#