由于想要分享的內(nèi)容較多，為避免讀者姥爺們失去看下去的耐心，分享將以連載的方式進行。

前期回顧：《移植speexdsp到OpenHarmony標準系統(tǒng)②》《移植speexdsp到OpenHarmony標準系統(tǒng)①》

本期為移植speexdsp到OpenHarmony標準系統(tǒng)的第③期，主要內(nèi)容如下：

speexdsp移植后已提交至openhamrony sig倉庫：https://gitee.com/openharmony-sig/contest/tree/master/2022_OpenHarmony_thirdparty/speexdsp

四、將三方庫加入到OpenHarmony的編譯體系

根據(jù)上一步分析結(jié)果，編寫gn文件，將三方庫加入到OpenHarmony的編譯體系。

OpenHarmony編譯構(gòu)建子系統(tǒng)提供了一個基于Gn和ninja的編譯構(gòu)建框架。根據(jù)產(chǎn)品配置，編譯生成對應(yīng)的鏡像包。其中編譯構(gòu)建流程為：

• 使用Gn配置構(gòu)建目標。

• Gn運行后會生成ninja文件。

• 通過運行ninja來執(zhí)行編譯任務(wù)。

OpenHarmony三方庫編譯環(huán)境搭建

本次移植時在openharmony3.2Beta1版本上運行的，所以需要準備openharmony3.2Beta1的源碼。

先在Widows上安裝虛擬機，在虛擬機上安裝Ubuntu18.04或者20.04。筆者使用的為Ubuntu20.04。

1.將Ubuntu Shell環(huán)境修改為bash

打開終端執(zhí)行

sudo dpkg-reconfigure dash

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將Shell由dash改為bash:

選擇<否>

更改成功如下：

2.下載華為集成開發(fā)環(huán)境 DevEco Device Tool Linux版本，目前最新版本號為3.1.0.200

HUAWEI DevEco Device Tool（以下簡稱DevEco Device Tool）是OpenHarmony面向智能設(shè)備開發(fā)者提供的一站式集成開發(fā)環(huán)境，支持OpenHarmony的組件按需定制，支持代碼編輯、編譯、燒錄和調(diào)試等功能，支持C/C++語言，以插件的形式部署在Visual Studio Code上。

直接在Ubuntu上打開firefox輸入下載地址下載

解壓DevEco Device Tool安裝包，并對解壓后的文件賦權(quán)

unzip devicetool-linux-tool-3.1.0.200.zip
chmod u+x devicetool-linux-tool-3.1.0.200.sh

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安裝DevEco Device,執(zhí)行命令安裝DevEco Device

sudo ./devicetool-linux-tool-3.1.0.200.sh

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終端打印出這條信息說明安裝成功

3.獲取標準系統(tǒng)源碼
執(zhí)行命令sudo apt-get install git git-lfs安裝git客戶端和git-lfs

配置git用戶信息

git config --global user.name "yourname"
git config --global user.email "your-email-address"
git config --global credential.helper store
git config --global credential.helper store

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執(zhí)行這個命令會在本地生成一個文本，上邊記錄配置。然后再拉取代碼就不用再輸入賬號信息了。

• 進入gitee官網(wǎng)個人主頁，個人頭像下方就是user.name

• 再進入設(shè)置點擊郵箱管理就可以得到你的your-email-address

• 安裝gitee碼云repo工具

sudo apt-get install curl
sudo curl https://gitee.com/oschina/repo/raw/fork_flow/repo-py3 -o /usr/local/bin/repo
sudo chmod a+x /usr/local/bin/repo
sudo pip3 install -i https://repo.huaweicloud.com/repository/pypi/simple requests

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使用repo+https下載發(fā)布Tag節(jié)點源碼，創(chuàng)建源碼存放目錄，進入創(chuàng)建的源碼存放目錄，執(zhí)行以下命令下載源碼

sudo ln -sf /usr/bin/python3 /usr/bin/python
repo init -u https://gitee.com/openharmony/manifest -b refs/tags/OpenHarmony-v3.2-Beta1 --no-repo-verify
repo sync -c
repo forall -c 'git lfs pull'

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3.在源碼目錄下執(zhí)行腳本安裝編譯器及二進制工具
下載的prebuilts二進制默認存放在與OpenHarmony同目錄下的OpenHarmony_2.0_canary_prebuilts下。

bash build/prebuilts_download.sh

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4.安裝依賴工具

sudo apt-get install binutils git git-lfs gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z1-dev ccache libgl1-mesa-dev libxml2-utils xsltproc unzip m4 bc gnutls-bin python3.8 python3-pip ruby

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5.最后測試一下OpenHarmony三方庫編譯環(huán)境，在源碼根目錄下執(zhí)行編譯命令

./build.sh --product-name rk3568 --ccache --build-target=要編譯的部件名 --target-cpu arm64
#其中：--product-name rk3568 指定產(chǎn)品名為rk3568 
#其中：--ccache       編譯使用ccache
#其中：--target-cpu arm64  編譯構(gòu)建64位系統(tǒng)

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在源碼目錄下執(zhí)行編譯zlib命令，生成libzlib.z.so

./build.sh --product-name rk3568 --ccache --build-target=zlib

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編譯生成了libzlib.z.so，編譯環(huán)境沒問題。

配置speexdsp源碼

下載完openharmony3.2Beta1源碼后，將speexdsp的源碼拷貝到openhamony的third_party目錄下。

在OpenHarmony/sources/third_party/speexdsp和OpenHarmony/sources/third_party/speexdsp/libspeexdsp下分別編寫一份BUILD.gn文件，完成speexdsp的gn及測試用例的gn化。測試用例指的是測試speexdsp功能的程序。

speexdsp編譯gn化,新增工程構(gòu)建腳本

OpenHarmony/sources/third_party/speexdsp下添加BUILD.gn腳本文件。

OpenHarmony/sources/third_party/speexdsp/BUILD.gn內(nèi)容如下：

import("http://build/ohos.gni") 


config("speexdsp_nowarn_config"){
  cflags = [
     "-Wno-implicit-function-declaration",
     "-Wno-pointer-sign",
     "-Wno-unused-variable",
  ]
}


config("speexdsp_cflag_config"){
  cflags = [
     "-g",
     "-O2",
     "-fvisibility=hidden",
     "-DHAVE_CONFIG_H",


  ]
  ldflags = [
     "-lm"
  ]
}


ohos_shared_library("speexdsp_share") {
  sources = [
     "libspeexdsp/preprocess.c",
     "libspeexdsp/jitter.c",
     "libspeexdsp/mdf.c",
     "libspeexdsp/fftwrap.c",
     "libspeexdsp/filterbank.c",
     "libspeexdsp/resample.c",
     "libspeexdsp/buffer.c",
     "libspeexdsp/scal.c",
     "libspeexdsp/smallft.c",
     ]
     
  defines = [
    "NL_DEBUG",
    "speexdsp_EXPORTS",
  ]
  
  configs = [ 
     ":speexdsp_cflag_config", 
     ":speexdsp_nowarn_config"
  ] 
  include_dirs = [
     ".",
     "libspeexdsp",
     "include"
  ]
  part_name = "speexdsp"
}

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代碼解析

第一行：

import("http://build/ohos.gni")

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import函數(shù)將ohos.gni文件導(dǎo)入到當前作用域。導(dǎo)入的文件是獨立執(zhí)行的，生成的作用域被復(fù)制到當前文件中。一個.gni文件會定義構(gòu)建參數(shù)和模板。build目錄下ohos.gni文件內(nèi)容如下

import("http://build/config/sanitizers/sanitizers.gni")
import("http://build/ohos/ndk/ndk.gni")
import("http://build/ohos/notice/notice.gni")
import("http://build/ohos/sa_profile/sa_profile.gni")
import("http://build/ohos_var.gni")
import("http://build/toolchain/toolchain.gni")


# import cxx base templates
import("http://build/templates/cxx/cxx.gni")
if (support_jsapi) {
 import("http://build/ohos/ace/ace.gni")
 import("http://build/ohos/app/app.gni")
}


import("http://build/templates/common/ohos_templates.gni")


# import prebuilt templates
import("http://build/templates/cxx/prebuilt.gni")

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第三行到第九行：

config("speexdsp_nowarn_config"){
  cflags = [
     "-Wno-implicit-function-declaration",
     "-Wno-pointer-sign",
     "-Wno-unused-variable",
  ]
}

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configs定義了該模塊編譯配置的環(huán)境變量speexdsp_nowarn_config，第24行ohos_shared_library定義了最終生成的模塊名，這里代表此模塊為最終生成libspeexdsp.z.so。所以在第五行到第七行中config中添加了編譯libspeexdsp.z.so需要添加的編譯器標志。

但是"-Wno-implicit-function-declaration"、"-Wno-pointer-sign""、-Wno-unused-variable"并非是分析speexdsp原生庫得來的cflag編譯器標志。

而是后來在ohos上編譯驗證過程中，根據(jù)編譯報錯信息添加的。如果不添加它們，執(zhí)行./build.sh --product-name rk3568 --ccache --build-target=speexdsp命令后，則無法編譯生成openharmony上的運行的libspeexdsp.z.so庫，會出現(xiàn)編譯警告信息-W-implicit-function-declaration、-W-pointer-sign、-W-unused-variable。解決辦法就是在gn化時添加cflag標志"-Wno-implicit-function-declaration"、"-Wno-pointer-sign""、-Wno-unused-variable"。

clang編譯器警告消除：

1. 出現(xiàn)警告的就是直接在-W后面加no，比如-Wimplicit-function-declaration改為 -Wno-implicit-function-declaration

2. 還有另外的一種方法：-Wimplicit-function-declaration=no

第十一到第二十二行：

config("speexdsp_cflag_config"){
  cflags = [
     "-g",
     "-O2",
     "-fvisibility=hidden",
     "-DHAVE_CONFIG_H",


  ]
  ldflags = [
     "-lm"
  ]
}

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• configs定義了該模塊編譯配置的環(huán)境變量speexdsp_cflag_config，在第十三行到第十六行添加了編譯需要添加的編譯器標志 "-g","-O2","-fvisibility=hidden", "-DHAVE_CONFIG_H"。

• "-g","-O2","-fvisibility=hidden"通過分析原生庫config.log和makefile文件，具體請查看第二期內(nèi)容。

• "-DHAVE_CONFIG_H"通過分析執(zhí)行build命令后編譯ohos上speexdsp的so庫報錯信息得來

添加"-DHAVE_CONFIG_H"后仍然有報錯信息，解決辦法是把linux下編譯speexdsp原生庫./configure后生成的config.h放置在thrid_party/speexdsp下。

第二十四行到第五十二行：

ohos_shared_library("speexdsp_share") {
  sources = [
     "libspeexdsp/preprocess.c",
     "libspeexdsp/jitter.c",
     "libspeexdsp/mdf.c",
     "libspeexdsp/fftwrap.c",
     "libspeexdsp/filterbank.c",
     "libspeexdsp/resample.c",
     "libspeexdsp/buffer.c",
     "libspeexdsp/scal.c",
     "libspeexdsp/smallft.c",
     ]
     
  defines = [
    "NL_DEBUG",
    "speexdsp_EXPORTS",
  ]
  
  configs = [ 
     ":speexdsp_cflag_config", 
     ":speexdsp_nowarn_config"
  ] 
  include_dirs = [
     ".",
     "libspeexdsp",
     "include"
  ]
  part_name = "speexdsp"
}

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第24行ohos_shared_library定義了最終生成的模塊名，這里代表此模塊為最終生成libspeexdsp.z.so/動態(tài)庫

如果是生成靜態(tài)庫ohos_static_library(" ") { }

• 第二十五行到第三十五行sources模塊包含了需要編譯的源碼文件

• 第四十六行到五十行include_dirs模塊包含了編譯依賴的頭文件路徑

• 第五十一行part_name 該模塊編譯依賴的編譯子系統(tǒng)組件名。該配置項是為了模塊最終生成的so文件能在系統(tǒng)編譯完后自動拷貝到系統(tǒng)目錄中。如果沒有配置該項，系統(tǒng)編譯完后是不會自動將生成的so文件拷貝到系統(tǒng)目錄。

測試用例gn化，新增工程構(gòu)建腳本

OpenHarmony/sources/third_party/speexdsp/libspeexdsp下添加BUILD.gn腳本文件。

import("http://build/ohos.gni")


config("test_nowarn_config"){
  cflags = [
     "-Wno-sign-compare",
     "-Wno-pointer-sign"
  ]
}




config("speexdsp_cflag_config") {
  ldflags = [ "-lm" ]
  cflags_cc = [
     "-g",
     "-O2",
     "-fvisibility=hidden",
  ]
}




config("speexdsp_config") {
  include_dirs = [
     "http://third_party/speexdsp/include"
   ]
}




ohos_executable("testdenoise"){
  public_configs = [ 
     ":speexdsp_config",
     ":test_nowarn_config"
  ]
  sources = [
     "testdenoise.c"
  ]
  configs = [
     ":speexdsp_cflag_config",


  ]
  
  deps = [
     "http://third_party/speexdsp:speexdsp_share"
  ]
  
  part_name = "speexdsp"
}


ohos_executable("testecho"){
  public_configs = [ 
     ":speexdsp_config",
     ":test_nowarn_config"
  ]
  sources = [
     "testecho.c"
  ]
  
  configs = [
     ":speexdsp_cflag_config"
  ]
  
  deps = [
     "http://third_party/speexdsp:speexdsp_share"
  ]
  
  part_name = "speexdsp"
}


ohos_executable("testjitter"){
  public_configs = [ 
     ":speexdsp_config",
     ":test_nowarn_config"
  ]
  sources = [
     "testjitter.c"
  ]
  
  configs = [
     ":speexdsp_cflag_config"
  ]
  
  deps = [
     "http://third_party/speexdsp:speexdsp_share"
  ]
  
  part_name = "speexdsp"
}


ohos_executable("testresample"){
  public_configs = [ 
     ":speexdsp_config",
     ":test_nowarn_config"
  ]
  sources = [
     "testresample.c"
  ]
  
  configs = [
     ":speexdsp_cflag_config"
  ]
  
  deps = [
     "http://third_party/speexdsp:speexdsp_share"
  ]
  
  part_name = "speexdsp"
}


ohos_executable("testresample2"){
   public_configs = [ 
     ":speexdsp_config",
     ":test_nowarn_config"
  ]
  sources = [
     "testresample2.c"
  ]
  
  configs = [
     ":speexdsp_cflag_config"
  ]
  
  deps = [
     "http://third_party/speexdsp:speexdsp_share"
  ]
  part_name = "speexdsp"
  
}

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代碼解析

測試用例gn化代碼解析的內(nèi)容與speexdsp編譯gn化內(nèi)容相似，這里不做重復(fù)解釋，只補充以下幾點。

• 測試用例是在ohos上測試libspeexdsp.z.so功能用的。

• 第28、48、68、88、108行：gn中的目標類型executable表示生成可執(zhí)行文件testdenoise、testecho、testjitter、testresample、testresample2。

• 第41、61、81、101、121行：deps表示測試用例模塊編譯依賴其他模塊,這里指的是測試用例的編譯依賴。libspeexdsp.z.so庫。

• 第45、65、85、105、125行：part_name表示測試用例模塊編譯依賴的編譯子系統(tǒng)組件名。該配置項是為了模塊最終生成的so文件能在系統(tǒng)編譯完后自動拷貝到系統(tǒng)目錄中。如果沒有配置該項，系統(tǒng)編譯完后是不會自動將生成的so文件拷貝到系統(tǒng)目錄。

OpenHarmony/sources/third_party/speexdsp目錄下添加ohos.build

• 定義子系統(tǒng)并加入到編譯框架
  在系統(tǒng)源碼根目錄下創(chuàng)建一個目錄作為子系統(tǒng)目錄，子系統(tǒng)目錄可創(chuàng)建在OpenHarmony源碼目錄任意位置。

• 本項目以third_party/speexdsp作為為子系統(tǒng)目錄，子系統(tǒng)名字即為speexdsp。

子系統(tǒng)speexdsp目錄下創(chuàng)建ohos.build文件，build構(gòu)建時會先讀取該文件。

"subsystem": "speexdsp",
 "parts": {
  "speexdsp": {
   "module_list": [
    "http://third_party/speexdsp/libspeexdsp:testdenoise",
    "http://third_party/speexdsp/libspeexdsp:testecho",
    "http://third_party/speexdsp/libspeexdsp:testjitter",
    "http://third_party/speexdsp/libspeexdsp:testresample",
    "http://third_party/speexdsp/libspeexdsp:testresample2"
   ],
   "inner_kits": [
       ],
   "system_kits": [
   ],
   "test_list": [
   ]
  }
 }
}

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build文件夾下的subsystem_config.json文件，主要包含子系統(tǒng)名稱與路徑信息，在preloader階段被加載，根據(jù)子系統(tǒng)名稱和路徑信息查找該路徑下的ohos.build文件。

其中需要包含module_list、inner_kits、system_kits、test_list四個部分的聲明：

• module_list：部件包含的模塊列表

• inner_kits：部件提供其它部件的接口

• system_kits：部件提供給生成應(yīng)用的接口

• test_list：部件對應(yīng)模塊的測試用例

修改build/subsystem_config.json，新增子系統(tǒng)定義

在源碼/build/subsystem_config.json中增加子系統(tǒng)選項,把子系統(tǒng)speexdsp配置到build/subsystem_config.json。

"speexdsp": {
  "path": "third_party/speexdsp",
  "name": "speexdsp"
 },

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注意：要求符合json語法規(guī)范，要在}前加,（如下圖所示）

修改vendor/hihope/rk3568/config.json文件將speexdsp添加至rk3568開發(fā)板，在vendor目錄下新增產(chǎn)品的定義

將子系統(tǒng)及其組件加入產(chǎn)品定義中，以rk3568為例，產(chǎn)品定義文件在vendor/hihope/rk3568/config.json，需要將以下內(nèi)容添加到config.json中：

{
   "subsystem": "speexdsp",
   "components": [
    {
     "component": "speexdsp",
     "features": []
    }
   ]
  },

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下期分享內(nèi)容:在OpenHarmony的編譯體系下編譯speexdsp的so和測試用的可執(zhí)行文件,以及編譯報錯的解決辦法

知識點附送

本文中知識點附送的內(nèi)容并不和移植speexdsp到openharmony標準系統(tǒng)直接相關(guān)，僅作為拓展閱讀的知識點，因此讀者可以不作過細的了解。

gn

generate ninja工具，在out目錄下生成ninja編譯文件*.ninja，gn的可執(zhí)行文件位置在prebuilts/build-tools/linux-x86目錄里

jiajiahao@ubuntu:~/Desktop/OpenHarmony/sources/prebuilts/build-tools/linux-x86/bin$ ./gn --help


Commands (type "gn help 

" for more help): analyze: Analyze which targets are affected by a list of files. args: Display or configure arguments declared by the build. check: Check header dependencies. clean: Cleans the output directory. desc: Show lots of insightful information about a target or config. format: Format .gn files. gen: Generate ninja files. help: Does what you think. ls: List matching targets. meta: List target metadata collection results. path: Find paths between two targets. refs: Find stuff referencing a target or file. Target declarations (type "gn help " for more help): action: Declare a target that runs a script a single time. action_foreach: Declare a target that runs a script over a set of files. bundle_data: [iOS/macOS] Declare a target without output. copy: Declare a target that copies files. create_bundle: [iOS/macOS] Build an iOS or macOS bundle. executable: Declare an executable target. generated_file: Declare a generated_file target. group: Declare a named group of targets. loadable_module: Declare a loadable module target. rust_library: Declare a Rust library target. rust_proc_macro: Declare a Rust procedural macro target. shared_library: Declare a shared library target. source_set: Declare a source set target. static_library: Declare a static library target. target: Declare an target with the given programmatic type. Buildfile functions (type "gn help " for more help): assert: Assert an expression is true at generation time. config: Defines a configuration object. declare_args: Declare build arguments. defined: Returns whether an identifier is defined. exec_script: Synchronously run a script and return the output. foreach: Iterate over a list. forward_variables_from: Copies variables from a different scope. get_label_info: Get an attribute from a target's label. get_path_info: Extract parts of a file or directory name. get_target_outputs: [file list] Get the list of outputs from a target. getenv: Get an environment variable. import: Import a file into the current scope. not_needed: Mark variables from scope as not needed. pool: Defines a pool object. print: Prints to the console. process_file_template: Do template expansion over a list of files. read_file: Read a file into a variable. rebase_path: Rebase a file or directory to another location. set_default_toolchain: Sets the default toolchain name. set_defaults: Set default values for a target type. set_sources_assignment_filter: Set a pattern to filter source files. split_list: Splits a list into N different sub-lists. string_join: Concatenates a list of strings with a separator. string_replace: Replaces substring in the given string. string_split: Split string into a list of strings. template: Define a template rule. tool: Specify arguments to a toolchain tool. toolchain: Defines a toolchain. write_file: Write a file to disk. Built-in predefined variables (type "gn help " for more help): current_cpu: [string] The processor architecture of the current toolchain. current_os: [string] The operating system of the current toolchain. current_toolchain: [string] Label of the current toolchain. default_toolchain: [string] Label of the default toolchain. gn_version: [number] The version of gn. host_cpu: [string] The processor architecture that GN is running on. host_os: [string] The operating system that GN is running on. invoker: [string] The invoking scope inside a template. python_path: [string] Absolute path of Python. root_build_dir: [string] Directory where build commands are run. root_gen_dir: [string] Directory for the toolchain's generated files. root_out_dir: [string] Root directory for toolchain output files. target_cpu: [string] The desired cpu architecture for the build. target_gen_dir: [string] Directory for a target's generated files. target_name: [string] The name of the current target. target_os: [string] The desired operating system for the build. target_out_dir: [string] Directory for target output files. Variables you set in targets (type "gn help " for more help): aliased_deps: [scope] Set of crate-dependency pairs. all_dependent_configs: [label list] Configs to be forced on dependents. allow_circular_includes_from: [label list] Permit includes from deps. arflags: [string list] Arguments passed to static_library archiver. args: [string list] Arguments passed to an action. asmflags: [string list] Flags passed to the assembler. assert_no_deps: [label pattern list] Ensure no deps on these targets. bundle_contents_dir: Expansion of {{bundle_contents_dir}} in create_bundle. bundle_deps_filter: [label list] A list of labels that are filtered out. bundle_executable_dir: Expansion of {{bundle_executable_dir}} in create_bundle bundle_resources_dir: Expansion of {{bundle_resources_dir}} in create_bundle. bundle_root_dir: Expansion of {{bundle_root_dir}} in create_bundle. cflags: [string list] Flags passed to all C compiler variants. cflags_c: [string list] Flags passed to the C compiler. cflags_cc: [string list] Flags passed to the C++ compiler. cflags_objc: [string list] Flags passed to the Objective C compiler. cflags_objcc: [string list] Flags passed to the Objective C++ compiler. check_includes: [boolean] Controls whether a target's files are checked. code_signing_args: [string list] Arguments passed to code signing script. code_signing_outputs: [file list] Output files for code signing step. code_signing_script: [file name] Script for code signing. code_signing_sources: [file list] Sources for code signing step. complete_static_lib: [boolean] Links all deps into a static library. configs: [label list] Configs applying to this target or config. contents: Contents to write to file. crate_name: [string] The name for the compiled crate. crate_root: [string] The root source file for a binary or library. crate_type: [string] The type of linkage to use on a shared_library. data: [file list] Runtime data file dependencies. data_deps: [label list] Non-linked dependencies. data_keys: [string list] Keys from which to collect metadata. defines: [string list] C preprocessor defines. depfile: [string] File name for input dependencies for actions. deps: [label list] Private linked dependencies. externs: [scope] Set of Rust crate-dependency pairs. framework_dirs: [directory list] Additional framework search directories. frameworks: [name list] Name of frameworks that must be linked. friend: [label pattern list] Allow targets to include private headers. include_dirs: [directory list] Additional include directories. inputs: [file list] Additional compile-time dependencies. ldflags: [string list] Flags passed to the linker. lib_dirs: [directory list] Additional library directories. libs: [string list] Additional libraries to link. metadata: [scope] Metadata of this target. output_conversion: Data format for generated_file targets. output_dir: [directory] Directory to put output file in. output_extension: [string] Value to use for the output's file extension. output_name: [string] Name for the output file other than the default. output_prefix_override: [boolean] Don't use prefix for output name. outputs: [file list] Output files for actions and copy targets. partial_info_plist: [filename] Path plist from asset catalog compiler. pool: [string] Label of the pool used by the action. precompiled_header: [string] Header file to precompile. precompiled_header_type: [string] "gcc" or "msvc". precompiled_source: [file name] Source file to precompile. product_type: [string] Product type for Xcode projects. public: [file list] Declare public header files for a target. public_configs: [label list] Configs applied to dependents. public_deps: [label list] Declare public dependencies. rebase: [boolean] Rebase collected metadata as files. response_file_contents: [string list] Contents of .rsp file for actions. script: [file name] Script file for actions. sources: [file list] Source files for a target. testonly: [boolean] Declares a target must only be used for testing. visibility: [label list] A list of labels that can depend on a target. walk_keys: [string list] Key(s) for managing the metadata collection walk. write_runtime_deps: Writes the target's runtime_deps to the given path. xcode_extra_attributes: [scope] Extra attributes for Xcode projects. xcode_test_application_name: [string] Name for Xcode test target. Other help topics: all: Print all the help at once buildargs: How build arguments work. dotfile: Info about the toplevel .gn file. execution: Build graph and execution overview. grammar: Language and grammar for GN build files. input_conversion: Processing input from exec_script and read_file. label_pattern: Matching more than one label. labels: About labels. metadata_collection: About metadata and its collection. ninja_rules: How Ninja build rules are named. nogncheck: Annotating includes for checking. output_conversion: Specifies how to transform a value to output. runtime_deps: How runtime dependency computation works. source_expansion: Map sources to outputs for scripts. switches: Show available command-line switches.

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ninja

ninja構(gòu)建工具，編譯時根據(jù)gn生成的*.ninja文件進行編譯構(gòu)建，ninjiad的可執(zhí)行文件位置在prebuilts/build-tools/linux-x86目錄里

jiajiahao@ubuntu:~/Desktop/OpenHarmony/sources/prebuilts/build-tools/linux-x86/bin$ ./ninja --help
usage: ninja [options] [targets...]


if targets are unspecified, builds the 'default' target (see manual).


options:
 --version   print ninja version ("1.10.1")
 -v, --verbose show all command lines while building


 -C DIR  change to DIR before doing anything else
 -f FILE specify input build file [default=build.ninja]


 -j N   run N jobs in parallel (0 means infinity) [default=18 on this system]
 -k N   keep going until N jobs fail (0 means infinity) [default=1]
 -l N   do not start new jobs if the load average is greater than N
 -n    dry run (don't run commands but act like they succeeded)


 -d MODE enable debugging (use '-d list' to list modes)
 -t TOOL run a subtool (use '-t list' to list subtools)
  terminates toplevel options; further flags are passed to the tool
 -w FLAG adjust warnings (use '-w list' to list warnings)

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關(guān)于deps、external_deps的使用

在添加一個模塊的時候，需要在BUILD.gn中聲明它的依賴，為了便于后續(xù)處理部件間依賴關(guān)系，我們將依賴分為兩種——部件內(nèi)依賴deps和部件間依賴external_deps。

依賴分類：

如上圖所示，主要分為部件內(nèi)依賴（圖左）和部件間依賴（圖右）。

部件內(nèi)依賴：現(xiàn)有模塊module1屬于部件part1，要添加一個屬于部件part1的模塊module2，module2依賴于module1，這種情況就屬于部件內(nèi)依賴。

部件間依賴：現(xiàn)有模塊module1屬于部件part1，要添加一個模塊module2，module2依賴于module1，module2屬于部件part2。模塊module2與模塊module1分屬于兩個不同的部件，這種情況就屬于部件間依賴。

部件內(nèi)依賴示例：

import("http://build/ohos.gni")
ohos_shared_library("module1") {
 ……
 part_name = "part1"  # 必選，所屬部件名稱
 ……
}

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import("http://build/ohos.gni")
ohos_shared_library("module2") {
 ……
 deps = [
  "module1的gn target",
 ……
 ]            # 部件內(nèi)模塊依賴
part_name = "part1"    # 必選，所屬部件名稱
}

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部件間依賴示例：

import("http://build/ohos.gni")
ohos_shared_library("module1") {
 ……
 part_name = "part1"  # 必選，所屬部件名稱
 ……
}

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import("http://build/ohos.gni")
ohos_shared_library("module2") {
 ……
 external_deps = [
  "part1:module1",
 ……
 ]           # 部件間模塊依賴，這里依賴的模塊必須是依賴的部件聲明在inner_kits中的模塊
 part_name = "part2"  # 必選，所屬部件名稱
}

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注意：部件間依賴要寫在external_deps里面，格式為”部件名:模塊名"的形式，并且依賴的模塊必須是依賴的部件聲明在inner_kits中的模塊。

查看.ninja_log文件可以知道每個模塊編譯的開始和結(jié)束時間

out/rk3568/.ninja_log文件記錄了每個模塊編譯的開始和結(jié)束時間(ms)，結(jié)束時間和開始時間間隔越短表示模塊的編譯時間越短，編譯性能越高。

從左到右分別表示：start time|end time|mtime|command hash。

mtime（modify time）顯示的是文件內(nèi)容被修改的最后時間

下期預(yù)告:在OpenHarmony的編譯體系下編譯speexdsp的so和測試用的可執(zhí)行文件,以及編譯報錯的解決辦法。

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