- hb build -f是全量编译，有近2k文件，编译速度非常慢
- 我使用的嵌入式板子是Hi3518EV300，编译过程中我发现了很多test也参与了编译，这些在对于非硬件驱动开发工程师来讲不需要。故 把此部分干掉会节省很多时间。修改如下文件/vendor/hisilicon/hispark_aries/config.json把子系统test删除，你会发现编译文件数量立即降到1k以内，我配置的config.json如下：
{
"product_name": "ipcamera_hispark_aries",
"ohos_version": "OpenHarmony 1.0",
"device_company": "hisilicon",
"board": "hispark_aries",
"kernel_type": "liteos_a",
"kernel_version": "",
"subsystems": [
{
"subsystem": "aafwk",
"components": [
{ "component": "ability", "features":[ "enable_ohos_appexecfwk_feature_ability = false" ] }
]
},
{
"subsystem": "applications",
"components": [
{ "component": "test_app", "features":[] }
]
},
{
"subsystem": "hiviewdfx",
"components": [
{ "component": "hilog", "features":[] }
]
},
{
"subsystem": "distributed_schedule",
"components": [
{ "component": "system_ability_manager", "features":[] },
{ "component": "foundation", "features":[] },
{ "component": "distributed_schedule", "features":[] }
]
},
{
"subsystem": "security",
"components": [
{ "component": "hichainsdk", "features":[] },
{ "component": "permission", "features":[] },
{ "component": "app_verify", "features":[] }
]
},
{
"subsystem": "graphic",
"components": [
{ "component": "graphic_utils", "features":[] },
{ "component": "surface", "features":[] }
]
},
{
"subsystem": "startup",
"components": [
{ "component": "syspara", "features":[] },
{ "component": "bootstrap", "features":[] },
{ "component": "init", "features":[] },
{ "component": "appspawn", "features":[] }
]
},
{
"subsystem": "kernel",
"components": [
{ "component": "liteos_a", "features":[] }
]
},
{
"subsystem": "communication",
"components": [
{ "component": "ipc", "features":[] },
{ "component": "soft_bus", "features":[] },
{ "component": "wpa_supplicant", "features":[] }
]
},
{
"subsystem": "drivers",
"components": [
{ "component": "adapter_uhdf", "features":[] },
{ "component": "peripheral_display", "features":[] },
{ "component": "peripheral_input", "features":[] },
{ "component": "peripheral_wlan", "features":[] }
]
},
{
"subsystem": "appexecfwk",
"components": [
{ "component": "bundle_mgr", "features":[] }
]
},
{
"subsystem": "utils",
"components": [
{ "component": "kv_store", "features":[] },
{ "component": "os_dump", "features":[] }
]
},
{
"subsystem": "vendor",
"components": [
{ "component": "middleware", "features":[] },
{ "component": "hi3518ev300_init", "features":[] },
{ "component": "hardware", "features":[] }
]
}
],
"vendor_adapter_dir": "//device/hisilicon/hardware",
"third_party_dir": "//third_party",
"product_adapter_dir": "//vendor/hisilicon/hispark_aries/hals",
"ohos_product_type":"",
"ohos_manufacture":"",
"ohos_brand":"",
"ohos_market_name":"",
"ohos_product_series":"",
"ohos_product_model":"",
"ohos_software_model":"",
"ohos_hardware_model":"",
"ohos_hardware_profile":"",
"ohos_serial":"",
"ohos_bootloader_version":"",
"ohos_secure_patch_level":"",
"ohos_abi_list":""
}
applications子系统是我自己写的测试demo，我把ai_server和media_server全部删除了，因为我这个dmeo不需要
- /vendor/hisilicon/hispark_aries/init_configs/init_liteos_a_3518ev300.cfg是系统启动后，init进程拉起的进程配置，配置如下：
{
"jobs" : [{
"name" : "pre-init",
"cmds" : [
"mkdir /storage/data/log",
"chmod 0755 /storage/data/log",
"chown 4 4 /storage/data/log",
"loadcfg /patch/fstab.cfg",
"mkdir /storage/data/softbus",
"chmod 0700 /storage/data/softbus",
"chown 7 7 /storage/data/softbus",
"mkdir /sdcard",
"chmod 0777 /sdcard",
"mount vfat /dev/mmcblk0 /sdcard rw,umask=000",
"mount vfat /dev/mmcblk1 /sdcard rw,umask=000"
]
}, {
"name" : "init",
"cmds" : [
"start shell",
"start apphilogcat",
"start foundation",
"start bundle_daemon",
"start appspawn",
"start hiview"
]
}, {
"name" : "post-init",
"cmds" : [
"chown 0 99 /dev/hdf/dev_mgr",
"chown 0 99 /dev/hdf/hdfwifi",
"chown 0 99 /dev/gpio",
"chown 0 99 /dev/i2c-0",
"chown 0 99 /dev/i2c-1",
"chown 0 99 /dev/i2c-2",
"chown 0 99 /dev/uartdev-0",
"chown 0 99 /dev/uartdev-1",
"chown 0 99 /dev/uartdev-2",
"chown 0 99 /dev/spidev0.0",
"chown 0 99 /dev/spidev1.0",
"chown 0 99 /dev/spidev1.1"
]
}
],
"services" : [{
"name" : "foundation",
"path" : ["/bin/foundation"],
"uid" : 7,
"gid" : 7,
"once" : 0,
"importance" : 1,
"caps" : [10, 11, 12, 13]
}, {
"name" : "shell",
"path" : ["/bin/shell"],
"uid" : 2,
"gid" : 2,
"once" : 0,
"importance" : 0,
"caps" : [4294967295]
}, {
"name" : "appspawn",
"path" : ["/bin/appspawn"],
"uid" : 1,
"gid" : 1,
"once" : 0,
"importance" : 0,
"caps" : [2, 6, 7, 8, 11, 23]
}, {
"name" : "apphilogcat",
"path" : ["/bin/apphilogcat"],
"uid" : 4,
"gid" : 4,
"once" : 1,
"importance" : 0,
"caps" : []
}, {
"name" : "wms_server",
"path" : ["/bin/wms_server"],
"uid" : 6,
"gid" : 6,
"once" : 1,
"importance" : 0,
"caps" : []
}, {
"name" : "bundle_daemon",
"path" : ["/bin/bundle_daemon"],
"uid" : 8,
"gid" : 8,
"once" : 0,
"importance" : 0,
"caps" : [0, 1]
}, {
"name" : "hiview",
"path" : ["/bin/hiview"],
"uid" : 4,
"gid" : 4,
"once" : 1,
"importance" : 0,
"caps" : []
}
]
}
- 这个时候编译你会发现还是有单元测试的模块编译进来如ai service，找到对应的BUILD.gn你会发现原来当编译是debug系统时会编译单元测试模块
import("//build/lite/config/component/lite_component.gni")
# manage all components of aisystem
lite_component("ai") {
features = [
"client:client",
"server:server",
]
if (ohos_build_type == "debug") {
deps = [ "//foundation/ai/engine/test" ]
}
}
而我们hb build编译时默认就是debug，如果编译release就不会有了，我们执行 hb build -f -b release,发现又少了100多个文件参与编译，我这边编译一次系统只有600多个文件了，速度比之前快了很多
- 另外鸿蒙支持模块编译，此模块对应的名称在/build/lite/components下面的json文件中，如我只想编译soft_bus模块，输入 hb build soft_bus即可，同时通过修改可以裁剪子系统下面的对应的模块