Makefile variables ($@, $< …) Embedded Linux


Android.mk 실행 원리와 순서 J's bar



0.envsetup.sh


0.1 In top layer Makefile

[출처] Android Building System|작성자 belfe7


[출처] Android Building System|작성자 belfe7

1. /LINUX/android/build/core/main.mk 파일 안에서 


    -> 하기의 config.mk 파일 호출



2. 안드로이드 빌드의 시작은 

   -> LINUX/android/build/core/config.mk 에서 시작한다.


   실행파일을 생성하는 구문인 경우


    TOPDIR:=

    OUT_DIR := $(TOPDIR)out

    BUILD_SYSTEM := $(TOPDIR)build/core

    BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk 


3. Config.mk 파일 안에서   

  -> LINUX/android/build/core/executable.mk


4. Config.mk 파일 안에서 

  -> include $(BUILD_SYSTEM)/pathmap.mk

     -> 여기까지 진행되는 것은 JAVA 소스의 경로 지정


5. "linked_module" 

   -> LINUX/android/build/core/defintions.mk


 5.1 "transform-o-to-static-executable" macro call <-"LINUX/android/build/core/defintions.mk"

 

 5.1.1 "transform-o-to-static-executable-inner" macro call <-"LINUX/android/build/core/TARGET-linux-arm.mk"

   ->TARGET_CXX := $(TARGET_TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX)

   ->TARGET_CXX := \g++.exe


 

$@목표 이름
$*목표 이름에서 확장자가 없는 이름
$<

조건 파일 중 첫번째 파일

$?목표 파일 보다 더 최근에 갱신된 파일 이름




[출처] Android Building System|작성자 belfe7

[출처] Android Building System|작성자 belfe7

 



문법

$(addsuffix 접미사, 문자열 )   ex) $(addsufix  .c, memo   main) => memo.c    main.c 

$(addprefix  접두더, 문자열 )   ex) $(addprefix src/, memo main) => src/memo     src/main

$(shell shell command)           ex) SH = $(shell ls *.c)  => shell 명령에 대한 결과가 변수에 들어감

$(subst 찾을 문자, 변경할 문자, 대상 문자)  => "대상문자"에서 "찾을 문자"를 "변경할 문자"로 변경해 준다. 

$(patsubst 찾을 패턴, 변경할 패턴, 대상 문자) => subst와 기능은 동일하나 확장자를 바꿀때 사용함    

$(strip 대상문자 ) => 대상문자에서 모든 공백을 1칸으로 줄인다. 여백이 많아도 모두 1칸으로

$(filter 찾을 문자, 대상문자) => 대상문자에서 찾을 문자를 포함한 문자들을 찾아서 저장한다. 

$(filter-out 찾을 문자, 대상문자) => filter와 반대로 찾을 문자가 있는 경우를 제외하고 저장한다.

$(join 원본문자, 붙일문자) => 원본문자와 붙일문자를 붙여서 한 문자로 만든다.

$(dir  대상문자)           => 대상문자에서 파일문자를 제외한 경로명만 추출한다. 

$(notdir  대상문자)           => 대상문자에서 파일명만 추출한다. 

$(baseanme  대상문자)           => 대상문자에서 확장자를 제외한 문자를 알려준다. 

$(eval func_call)

- eval
우리가 만든 함수를 호출하는 것은 내장함수 call입니다. call은 단순히 우리가 만든 함수를 call이 호출되는 부분에 치환하는 일만을 합니다. 따라서 우리가 만든 함수가 빌드 규칙을 만들기 위한 함수라면 call만으로는 빌드 규칙을 생성할 수 없습니다.

mkdir -p (no error if existing, make parent directory as needed)


include file
다른 makefile 을 포함한다. 
See section 다른 makefile 삽입(Including Other Makefiles).

from : http://blog.naver.com/hyunsung1026?Redirect=Log&logNo=80145257300


android users J's bar

//---------------------------------------------------------------------------
// system/core/include/private/android_filesystem_config.h
//---------------------------------------------------------------------------
/* This is the master Users and Groups config for the platform.
** DO NOT EVER RENUMBER.
*/

#define AID_ROOT             0  /* traditional unix root user */
#define AID_SYSTEM        1000  /* system server */
#define AID_RADIO         1001  /* telephony subsystem, RIL */
#define AID_BLUETOOTH     1002  /* bluetooth subsystem */
#define AID_GRAPHICS      1003  /* graphics devices */
#define AID_INPUT         1004  /* input devices */
#define AID_AUDIO         1005  /* audio devices */
#define AID_CAMERA        1006  /* camera devices */
#define AID_LOG           1007  /* log devices */
#define AID_COMPASS       1008  /* compass device */
#define AID_MOUNT         1009  /* mountd socket */
#define AID_WIFI          1010  /* wifi subsystem */
#define AID_ADB           1011  /* android debug bridge (adbd) */
#define AID_INSTALL       1012  /* group for installing packages */
#define AID_MEDIA         1013  /* mediaserver process */
#define AID_DHCP          1014  /* dhcp client */
#define AID_SHELL         2000  /* adb and debug shell user */
#define AID_CACHE         2001  /* cache access */
#define AID_DIAG          2002  /* access to diagnostic resources */

/* The 3000 series are intended for use as supplemental group id's only.
 * They indicate special Android capabilities that the kernel is aware of. */
#define AID_NET_BT_ADMIN  3001  /* bluetooth: create any socket */
#define AID_NET_BT        3002  /* bluetooth: create sco, rfcomm or l2cap sockets */
#define AID_INET          3003  /* can create AF_INET and AF_INET6 sockets */
#define AID_NET_RAW       3004  /* can create raw INET sockets */
#define AID_MISC          9998  /* access to misc storage */
#define AID_NOBODY        9999
#define AID_APP          10000 /* first app user */

static struct android_id_info android_ids[] = {
    { "root",      AID_ROOT, },
    { "system",    AID_SYSTEM, },
    { "radio",     AID_RADIO, },
    { "bluetooth", AID_BLUETOOTH, },
    { "graphics",  AID_GRAPHICS, },
    { "input",     AID_INPUT, },
    { "audio",     AID_AUDIO, },
    { "camera",    AID_CAMERA, },
    { "log",       AID_LOG, },
    { "compass",   AID_COMPASS, },
    { "mount",     AID_MOUNT, },
    { "wifi",      AID_WIFI, },
    { "dhcp",      AID_DHCP, },
    { "adb",       AID_ADB, },
    { "install",   AID_INSTALL, },
    { "media",     AID_MEDIA, },
    { "shell",     AID_SHELL, },
    { "cache",     AID_CACHE, },
    { "diag",      AID_DIAG, },
    { "net_bt_admin", AID_NET_BT_ADMIN, },
    { "net_bt",    AID_NET_BT, },
    { "inet",      AID_INET, },
    { "net_raw",   AID_NET_RAW, },
    { "misc",      AID_MISC, },
    { "nobody",    AID_NOBODY, },
};

/* Rules for directories.
** These rules are applied based on "first match", so they
** should start with the most specific path and work their
** way up to the root.
*/

static struct fs_path_config android_dirs[] = {
    { 00770, AID_SYSTEM, AID_CACHE,  "cache" },
    { 00771, AID_SYSTEM, AID_SYSTEM, "data/app" },
    { 00771, AID_SYSTEM, AID_SYSTEM, "data/app-private" },
    { 00771, AID_SYSTEM, AID_SYSTEM, "data/dalvik-cache" },
    { 00771, AID_SYSTEM, AID_SYSTEM, "data/data" },
    { 00771, AID_SHELL,  AID_SHELL,  "data/local/tmp" },
    { 00771, AID_SHELL,  AID_SHELL,  "data/local" },
    { 01771, AID_SYSTEM, AID_MISC,   "data/misc" },
    { 00770, AID_DHCP,   AID_DHCP,   "data/misc/dhcp" },
    { 00771, AID_SYSTEM, AID_SYSTEM, "data" },
    { 00750, AID_ROOT,   AID_SHELL,  "sbin" },
    { 00755, AID_ROOT,   AID_SHELL,  "system/bin" },
    { 00755, AID_ROOT,   AID_SHELL,  "system/xbin" },
    { 00777, AID_ROOT,   AID_ROOT,   "system/etc/ppp" }, /* REMOVE */
    { 00777, AID_ROOT,   AID_ROOT,   "sdcard" },
    { 00755, AID_ROOT,   AID_ROOT,   0 },
};


/* Rules for files.
** These rules are applied based on "first match", so they
** should start with the most specific path and work their
** way up to the root. Prefixes ending in * denotes wildcard
** and will allow partial matches.
*/
static struct fs_path_config android_files[] = {
    { 00555, AID_ROOT,      AID_ROOT,      "system/etc/ppp/ip-up" },
    { 00555, AID_ROOT,      AID_ROOT,      "system/etc/ppp/ip-down" },
    { 00440, AID_ROOT,      AID_SHELL,     "system/etc/init.goldfish.rc" },
    { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.goldfish.sh" },
    { 00440, AID_ROOT,      AID_SHELL,     "system/etc/init.trout.rc" },
    { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.ril" },
    { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.testmenu" },
    { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.gprs-pppd" },
    { 00550, AID_DHCP,      AID_SHELL,     "system/etc/dhcpcd/dhcpcd-run-hooks" },
    { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/dbus.conf" },
    { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluez/hcid.conf" },
    { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluez/input.conf" },
    { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluez/audio.conf" },
    { 00440, AID_RADIO,     AID_AUDIO,     "/system/etc/AudioPara4.csv" },
    { 00644, AID_SYSTEM,    AID_SYSTEM,    "data/app/*" },
    { 00644, AID_SYSTEM,    AID_SYSTEM,    "data/app-private/*" },
    { 00644, AID_APP,       AID_APP,       "data/data/*" },
        /* the following two files are INTENTIONALLY set-gid and not set-uid.
         * Do not change. */
    { 02755, AID_ROOT,      AID_NET_RAW,   "system/bin/ping" },
    { 02755, AID_ROOT,      AID_INET,      "system/bin/netcfg" },
        /* the following four files are INTENTIONALLY set-uid, but they
     * are NOT included on user builds. */
    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/su" },
    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/librank" },
    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/procrank" },
    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/procmem" },
    { 00755, AID_ROOT,      AID_SHELL,     "system/bin/*" },
    { 00755, AID_ROOT,      AID_SHELL,     "system/xbin/*" },
    { 00750, AID_ROOT,      AID_SHELL,     "sbin/*" },
    { 00755, AID_ROOT,      AID_ROOT,      "bin/*" },
    { 00750, AID_ROOT,      AID_SHELL,     "init*" },
    { 00644, AID_ROOT,      AID_ROOT,       0 },
};

//---------------------------------------------------------------------------
// system/core/init/devices.c
//---------------------------------------------------------------------------

static struct perms_ devperms[] = {
    { "/dev/null",          0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/zero",          0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/full",          0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/ptmx",          0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/tty",           0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/random",        0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/urandom",       0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/ashmem",        0666,   AID_ROOT,       AID_ROOT,       0 },
    { "/dev/binder",        0666,   AID_ROOT,       AID_ROOT,       0 },

        /* logger should be world writable (for logging) but not readable */
    { "/dev/log/",          0662,   AID_ROOT,       AID_LOG,        1 },

        /* these should not be world writable */
    { "/dev/android_adb",   0660,   AID_ADB,        AID_ADB,        0 },
    { "/dev/android_adb_enable",   0660,   AID_ADB,        AID_ADB,        0 },
    { "/dev/ttyMSM0",       0600,   AID_BLUETOOTH,  AID_BLUETOOTH,  0 },
    { "/dev/ttyHS0",        0600,   AID_BLUETOOTH,  AID_BLUETOOTH,  0 },
    { "/dev/uinput",        0600,   AID_BLUETOOTH,  AID_BLUETOOTH,  0 },
    { "/dev/alarm",         0664,   AID_SYSTEM,     AID_RADIO,      0 },
    { "/dev/tty0",          0660,   AID_ROOT,       AID_SYSTEM,     0 },
    { "/dev/graphics/",     0660,   AID_ROOT,       AID_GRAPHICS,   1 },
    { "/dev/hw3d",          0660,   AID_SYSTEM,     AID_GRAPHICS,   0 },
    { "/dev/input/",        0660,   AID_ROOT,       AID_INPUT,      1 },
    { "/dev/eac",           0660,   AID_ROOT,       AID_AUDIO,      0 },
    { "/dev/cam",           0660,   AID_ROOT,       AID_CAMERA,     0 },
    { "/dev/pmem",          0660,   AID_SYSTEM,     AID_GRAPHICS,   0 },
    { "/dev/pmem_gpu",      0660,   AID_SYSTEM,     AID_GRAPHICS,   1 },
    { "/dev/pmem_adsp",     0660,   AID_SYSTEM,     AID_AUDIO,      1 },
    { "/dev/pmem_camera",   0660,   AID_SYSTEM,     AID_CAMERA,     1 },
    { "/dev/oncrpc/",       0660,   AID_ROOT,       AID_SYSTEM,     1 },
    { "/dev/adsp/",         0660,   AID_SYSTEM,     AID_AUDIO,      1 },
    { "/dev/mt9t013",       0660,   AID_SYSTEM,     AID_SYSTEM,     0 },
    { "/dev/akm8976_daemon",0640,   AID_COMPASS,    AID_SYSTEM,     0 },
    { "/dev/akm8976_aot",   0640,   AID_COMPASS,    AID_SYSTEM,     0 },
    { "/dev/akm8976_pffd",  0640,   AID_COMPASS,    AID_SYSTEM,     0 },
    { "/dev/msm_pcm_out",   0660,   AID_SYSTEM,     AID_AUDIO,      1 },
    { "/dev/msm_pcm_in",    0660,   AID_SYSTEM,     AID_AUDIO,      1 },
    { "/dev/msm_pcm_ctl",   0660,   AID_SYSTEM,     AID_AUDIO,      1 },
    { "/dev/msm_snd",       0660,   AID_SYSTEM,     AID_AUDIO,      1 },
    { "/dev/msm_mp3",       0660,   AID_SYSTEM,     AID_AUDIO,      1 },
    { "/dev/msm_audpre",    0660,   AID_SYSTEM,     AID_AUDIO,      0 },
    { "/dev/htc-acoustic",  0660,   AID_SYSTEM,     AID_AUDIO,      0 },
    { "/dev/smd0",          0640,   AID_RADIO,      AID_RADIO,      0 },
    { "/dev/qmi",           0640,   AID_RADIO,      AID_RADIO,      0 },
    { "/dev/qmi0",          0640,   AID_RADIO,      AID_RADIO,      0 },
    { "/dev/qmi1",          0640,   AID_RADIO,      AID_RADIO,      0 },
    { "/dev/qmi2",          0640,   AID_RADIO,      AID_RADIO,      0 },
    { NULL, 0, 0, 0, 0 },
};


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