使用 mmm 编译的时候 Android 执行的 ONE_SHOT make， 其如何实现？
mmm 的源代码在 build/envsetup.sh 中
function mmm() 641 { 642 T=$(gettop) 643 if [ "$T" ]; then 644 local MAKEFILE= 645 local MODULES= 646 local ARGS= 647 local DIR TO_CHOP 648 local DASH_ARGS=$(echo "$@" | awk -v RS=" " -v ORS=" " '/^-.*$/') 649 local DIRS=$(echo "$@" | awk -v RS=" " -v ORS=" " '/^[^-].*$/') 650 for DIR in $DIRS ; do 651 MODULES=`echo $DIR | sed -n -e 's/.*:\(.*$\)/\1/p' | sed 's/,/ /'` 652 if [ "$MODULES" = "" ]; then 653 MODULES=all_modules 654 fi 655 DIR=`echo $DIR | sed -e 's/:.*//' -e 's:/$::'` 656 if [ -f $DIR/Android.mk ]; then 657 TO_CHOP=`(cd -P -- $T && pwd -P) | wc -c | tr -d ' '` 658 TO_CHOP=`expr $TO_CHOP + 1` 659 START=`PWD= /bin/pwd` 660 MFILE=`echo $START | cut -c${TO_CHOP}-` 661 if [ "$MFILE" = "" ] ; then 662 MFILE=$DIR/Android.mk 663 else 664 MFILE=$MFILE/$DIR/Android.mk 665 fi 666 MAKEFILE="$MAKEFILE $MFILE" 667 else 668 if [ "$DIR" = snod ]; then 669 ARGS="$ARGS snod" 670 elif [ "$DIR" = showcommands ]; then 671 ARGS="$ARGS showcommands" 672 elif [ "$DIR" = dist ]; then 673 ARGS="$ARGS dist" 674 elif [ "$DIR" = incrementaljavac ]; then 675 ARGS="$ARGS incrementaljavac" 676 else 677 echo "No Android.mk in $DIR." 678 return 1 679 fi 680 fi 681 done 682 ONE_SHOT_MAKEFILE="$MAKEFILE" make -C $T $DASH_ARGS $MODULES $ARGS 683 else 684 echo "Couldn't locate the top of the tree. Try setting TOP." 685 fi 686 }但运行下面的命令
mmm sdk/emulator/opengl/tests/translator_tests/GLES_V2
最终生成命令行
ONE_SHOT_MAKEFILE=sdk/emulator/opengl/tests/translator_tests/GLES_V2/Android.mk make -C /home/payne/njb all_modules注意
ONE_SHOT_MAKEFILE=sdk/emulator/opengl/tests/translator_tests/GLES_V2/Android.mk 是参数
make -C /home/payne/njb all_modules 才是命令
就是说带着 ONE_SHOT_MAKEFILE 的参数去执行 make 命令， 而make的target 是 all_modules
在 build/core/main.mk#467
ifneq ($(ONE_SHOT_MAKEFILE),)# We've probably been invoked by the "mm" shell function# with a subdirectory's makefile.include $(ONE_SHOT_MAKEFILE)# Change CUSTOM_MODULES to include only modules that were# defined by this makefile; this will install all of those# modules as a side-effect. Do this after including ONE_SHOT_MAKEFILE# so that the modules will be installed in the same place they# would have been with a normal make.CUSTOM_MODULES := $(sort $(call get-tagged-modules,$(ALL_MODULE_TAGS)))FULL_BUILD :=# Stub out the notice targets, which probably aren't defined# when using ONE_SHOT_MAKEFILE.NOTICE-HOST-%: ;NOTICE-TARGET-%: ;
当环境变量 ONE_SHOT_MAKEFILE不是空的时候, 就被 include 进来了，此 mk 的 LOCAL_MODULE 也将会让 all_modules 去依赖（加入到变量ALL_MODULES中），这样 make all_modules 的时候，就会先编译依赖的 LOCAL_MODULE了； 当然不相关的 module不会加入到 ALL_MODULES
build/core/main.mk#813
813 .PHONY: all_modules
814 all_modules: $(ALL_MODULES)