理解 Android 的 ONE_SHOT_MAKEFILE

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 makeall_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)

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