Android compilation system first involved

Rule format for makefile file Target:prefequistes COMMANDS

#include <stdio.h>#include <utility.h>int main(int argc,char *argv[]){    printf("%d",getNumber());    return0;}utility.hint getNumber();utility.cint getNumber(){    return2;}

Example

SimpleMakefile:main.o utility.o     gcc -o SimpleMakefile main.o utility.omain.o:main.c   gcc -c main.cutility.o:utility.c gcc -c utility.cMakefile(另一种写法)OBEJCT=main.o utility.oSimpleMakefile:$(OBEJCT)gcc -o SimpleMakefile $(OBEJCT)

Compilation of Android system:

1. 1.makefile->build/core/main.mk

2. MAIN.MK's droid Process
   app:droid->app_only->$ (Unbunled_build_modules)
   System: Droid->droidcore
   ->dist_files

3. MAIN.MK custom files (processing attribute parts)
   Vendorsetup.sh (appearing in envsetup.sh)
   Androidproducts.mk
   Boardconfig.mk
   Android.mk (appearing in main.mk)

4. Droidcore compilation process

# The process of generating Droidcore main files with the last generated Installed-files.txt record pre-installed program module# All executable packages responsible for generating the system, such as System.img boot.img recovery.img, etc..Phony:DroidcoreDroidcore:Files Systemimage$(Installed_bootimage_target)$(Installed_recoveryimage_target)$(Installed_userdataimage_target)$(Installed_cacheimage_target)$(Installed_vendorimage_target)$(Installed_files_file)------------------------------Files-----------------------------------------# focus on the files generation process# prebuilt This mechanism for earlier versions.Phony:FilesFiles:prebuilt$(Modules_to_install)$(Installed_android_info_txt_target)# describes the modules that the system needs to install# product_files List of installation files for each modules# Tags_to_install Modules that are selectively compiled by flags# Get-tagged-modules Determines if the target has a "reject" tag, and if so, does not compileModules_to_install:=$(Sort$(All_default_installed_modules)$(Product_files)$(foreach tag,$(Tags_to_install),$($(tag)) (_modules))$(Call Get-tagged-modules, Shell_$(Target_shell))$(Custom_modules))----------------------------------------------------------------------------------------------------------Systemimag E-----------------------------------# This definition is in Build/core/makefile# Built_systemimage: = $ (systemimage_intermediates)/system.img final generated system.img file# [Email protected] represents a collection of target$(Installed_systemimage): $(Built_systemimage)$(Recovery_from_boot_patch) |$(ACP)@echo "Install system FS Image: [email protected]"    $(Copy-file-to-target)$(Hide$(Call Assert-max-image-size,[email protected] $(Recovery_from_boot_patch),$(board_systemimage_partition_size), yaffs)Systemimage: $(Installed_systemimage)----------------------------------------------------------------------------

1. Dist_files compilation process

# 在outforlibraryintowith a full build..PHONY: dist_files

ANDROID.MK System Example

• Take the android.mk of the $ (source) \SYSTEM\CORE\ADB project as an example

# Copyright 2005 the Android Open Source Project## android.mk for ADB#local_path:=$(Pagermy-dir)# ADB Host tool# =========================================================# Clear_vars Remove hundreds of Local_path outside the variableInclude$(Clear_vars)# Default to a virtual (sockets) USB Interface# define USB driveUsb_srcs: =extra_srcs: =ifeQ ($ (host_os), Linux) Usb_srcs: = usb_linux.c Extra_srcs: = get_my_path_linux.c local_ldlibs + =-lrt-ldl-lpthread LOCAL_CFLAGS + = -dworkaround_bug6558362endififeQ ($ (host_os), Darwin) Usb_srcs: = usb_osx.c Extra_srcs: = get_my_path_darwin.c local_ldlibs + =-lpthread-framework CoreFoundation- Framework Iokit-framework CarbonendififeQ ($ (host_os), FreeBSD) Usb_srcs: = USB_LIBUSB.C Extra_srcs: = get_my_path_freebsd.c Local_ldlibs + =-lpthread-lusbendififeQ ($ (host_os), Windows) Usb_srcs: = usb_windows.c Extra_srcs: = get_my_path_windows.c.. /libcutils/list.c extra_static_libs: = Adbwinapi IfneQ ($ (strip $ (use_cygwin)),)# Pure Cygwin caseLocal_ldlibs + =-lpthread-lgdi32 Local_c_includes + =/usr/include/W32API/DDKendif IfneQ ($ (strip $ (use_mingw)),)# MinGW under Linux caseLocal_ldlibs + =-lws2_32-lgdi32 Use_sysdeps_win32: =1Local_c_includes + =/usr/i586-MINGW32MSVC/INCLUDE/DDK endif local_c_includes + = Development/host/windows/usb/api/endif# All the source files used to define this module include the driver variables used aboveLocal_src_files: = adb.c console.c transport.c transport_local.c transport_usb.c commandline.c adb_client.c adb_auth_host.c sockets.c services.c file_sync_client.c$(EXTRA_SRCS)$(USB_SRCS) Usb_vendors.clocal_c_includes + = External/openssl/includeifneQ ($ (use_sysdeps_win32),) Local_src_files + = sysdeps_win32.cElseLocal_src_files + = fdevent.cendiflocal_cflags +-o2-g-dadb_host=1-wall-wno-unused-parameterlocal_cflags + =-d_xopen_source-d_gnu_source# The name of the module to be generatedLocal_module: = adblocal_module_tags: = Debug# Compile the libraries you need to useLocal_static_libraries: = Libzipfile Libunz libcrypto_static$(Extra_static_libs) IFEQ ($ (use_sysdeps_win32),) local_static_libraries + = Libcutilsendif# indicates a host executable file is generatedInclude$(build_host_executable)$(Call dist- for-goals,dist_files SDK,$(Local_built_module)) IfeQ ($ (host_os), Windows)$(Local_installed_module):$(Host_out_executables)/adbwinapi.dll$(Host_out_executables)/adbwinusbapi.dllendif# adbd Device Daemon# =========================================================# Second Module compilation start FlagInclude$(Clear_vars) Local_src_files: = ADB.C backup_service.c fdevent.c transport.c transport_local.c Trans PORT_USB.C adb_auth_client.c sockets.c services.c file_sync_service.c jdwp_service.c framebuffer_s ervice.c remount_service.c usb_linux_client.c log_service.clocal_cflags: =-o2-g-dadb_host=0-wall-wno-unused-parameterlocal_cflags + =-d_xopen_source-d_gnu_sourceifneQ (,$(filter Userdebug Eng,$ (target_build_variant))) Local_cflags + =-dallow_adbd_root=1endif# The name of the module to be generatedLocal_module: = adbdlocal_force_static_executable: = Truelocal_module_path: =$(Target_root_out_sbin) Local_unstripped_path: =$(target_root_out_sbin_unstripped) Local_static_libraries: = Liblog libcutils libc libmincrypt# Generate ADBD executable fileInclude$(build_executable)

ANDROID.MK variable parsing

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Android compilation system first involved