14.5.2 開發第一個應用程序

1安裝工具鏈

對于需要在不同的HOST主機上針對于G2L RemiPI進行應用開發，我們需要手動安裝上一章節生成的工具鏈程序，才可以進行后續的開發操作。

首先我們將poky-glibc-x86_64-myir-image-full-aarch64-myir-remi-1g-toolchain-3.1.20.sh工具鏈拷貝至ubuntu虛擬機家目錄下，拷貝完成后，直接執行即可開始安裝，參考步驟如下。

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ubuntu@ubuntu2004:~$ ls poky-glibc-x86_64-myir-image-full-aarch64-myir-remi-1g-toolc
hain-3.1.20.sh -l
-rwxr-xr-x 1 ubuntu ubuntu 1967617427 May 9 05:23 poky-glibc-x86_64-myir-image-full-
aarch64-myir-remi-1g-toolchain-3.1.20.sh
ubuntu@ubuntu2004:~$ ./poky-glibc-x86_64-myir-image-full-aarch64-myir-remi-1g-toolch
ain-3.1.20.sh Each time you wish to use the SDK in a new shell session, you need to s
ource the environment setup script e.g.
$ . /opt/remi-sdk/environment-setup-aarch64-poky-linux
$ . /opt/remi-sdk/environment-setup-armv7vet2hf-neon-vfpv4-pokymllib32-linux-gnueab
i

安裝時，會彈出對話框，提示輸入安裝路徑，以及是否安裝，具體操作參考下圖所示：

2測試工具鏈

執行`source /opt/poky/3.1.20/environment-setup-aarch64-poky-linux`與`$CC-v`兩條命令：

出現以上信息，表示SDK安裝成功，接下來就可以直接使用安裝好的SDK進行應用開發。

配置完成工具鏈以后會有一下編譯器名稱，分別是：

?CC

?CFLAGS

?CXX

?CXXFLAGS

?LD

?LDFLAGS

?ARCH

?CROSS_COMPILE

?GDB

?OBJDUMP

編譯器。

C標志，由C編譯器使用。

C++編譯器。

C++標志，由CPP使用

鏈接器。

鏈接標志，由鏈接器使用。

芯片架構名稱。

用于內核編譯。

調試器。

objdump。

如果你需要編譯系統鏡像配套的應用程序，則需要在編譯時指定sysroot對應的lib庫與頭文件。

lib64庫路徑

/opt/poky/3.1.20/sysroots/aarch64-poky-linux/usr/lib64

頭文件路徑

/opt/poky/3.1.20/sysroots/aarch64-poky-linux/usr/include

3編寫應用程序

接下來使用c語言編寫一個簡單的helloword程序，通過前面我們安裝好的工具鏈交叉編譯，最后上傳至G2L RemiPI安裝。

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#include 


int main(int argc,char **argv)
{
 printf("Hello RemiPi!!
");
 return 0;
}

設置環境變量，編譯hello.c文件。

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ubuntu@ubuntu2004:~$ source /opt/poky/3.1.20/environment-setup-aarch64-poky-linux
ubuntu@ubuntu2004:~$ $CC hello.c -o hello
In file included from /opt/poky/3.1.20/sysroots/aarch64-poky-linux/usr/include/bits/
libc-header-start.h:33,
 from /opt/poky/3.1.20/sysroots/aarch64-poky-linux/usr/include/stdio.
h:27,
 from hello.c:1:
/opt/poky/3.1.20/sysroots/aarch64-poky-linux/usr/include/features.h:397:4: warning: 
#warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
# warning _FORTIFY_SOURCE requires compiling with optimization (-O)
 ^~~~~~~
ubuntu@ubuntu2004:~$ file hello
hello: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linke
d, interpreter /lib64/ld-linux-aarch64.so.1, for GNU/Linux 3.14.0, BuildID[sha1]=eb5
28014693897face9614c09959056f19759777, with debug_info, not stripped

4上傳并運行

編譯完成后，通過前面章節介紹的SCP方式，發送到開發板內，然后運行，即可看到C程序打印的Hello RemiPi!!

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ubuntu@ubuntu2004:~/C-Test$ scp hello root@192.168.5.9:/mnt/
hello 100% 13KB 
2.1MB/s 00:00

在開發板上執行hello程序：

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root@myir-remi-1g:/mnt# ls
hello
root@myir-remi-1g:/mnt# ./hello
Hello RemiPi!!

14.6bitbake使用

14.6.1 顯示編譯過程

bitbake-v <>

14.6.2 清除編譯數據

bitbake-c cleanall recipe_name

清除包括clean、cleanall、cleanstate

14.6.3 編譯過程的信息

附帶debug信息：

bitbake-vDD

14.6.4 查看某個配方的任務

（{recipe}_{version}.bb）：

bitbake-c listtasks recipe_name

14.6.5 顯示所有配方的版本

當前版本和首選版本：

bitbake-s

14.6.6 構建一個recipe

執行該recipe的所有tasks：

bitbade recipe-name

14.6.7 執行某個recipe的.bb文件

bitbake-b {recipe}_{version}.bb

14.6.8 只運行recipe中的某個task

bitbake-c your-task recipe-name

常見task：

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do_build Default task for a recipe - depends on all other normal
tasks required to 'build' a recipe

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do_checkuri Validates the SRC_URI value

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do_checkuriall Validates the SRC_URI value for all recipes required t
o build a target

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do_clean Removes all output files for a target
do_cleanall Removes all output files, shared state cache, and downl
oaded source files for a target

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do_cleansstate Removes all output files and shared state cache for a t
arget

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do_compile Compiles the source in the compilation directory

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do_configure Configures the source by enabling and disabling any bui
ld-time and configuration options for the software being built

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do_devpyshell Starts an interactive Python shell for development/deb
ugging

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do_devshell Starts a shell with the environment set up for developm
ent/debugging

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do_fetch Fetches the source code

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do_fetchall Fetches all remote sources required to build a target

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do_install Copies files from the compilation directory to a holdin
g area

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do_listtasks Lists all defined tasks for a target

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do_package Analyzes the content of the holding area and splits it 
into subsets based on available packages and files

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do_package_qa Runs QA checks on packaged files

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do_package_qa_setscene Runs QA checks on packaged files (setscene version)

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do_package_setscene Analyzes the content of the holding area and splits it
into subsets based on available packages and files (setscene version)

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do_package_write_ipk Creates the actual IPK packages and places them in the
Package Feed area

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do_package_write_ipk_setscene Creates the actual IPK packages and places them in the
Package Feed area (setscene version)

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do_packagedata Creates package metadata used by the build system to ge
nerate the final packages

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do_packagedata_setscene Creates package metadata used by the build system to g
enerate the final packages (setscene version)

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do_patch Locates patch files and applies them to the source code

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do_populate_lic Writes license information for the recipe that is coll
ected later when the image is constructed

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do_populate_lic_setscene Writes license information for the recipe that is coll
ected later when the image is constructed (setscene version)

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do_populate_sysroot Copies a subset of files installed by do_install into 
the sysroot in order to make them available to other recipes

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do_populate_sysroot_setscene Copies a subset of files installed by do_install into 
the sysroot in order to make them available to other recipes (setscene version)

do_prebuilt 
do_recipe_sanity 
do_recipe_sanity_all

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do_unpack Unpacks the source code into a working directory

下載（fetch）、解包（unpack）、打補丁（patch）、配置（configure）、編譯（compile）、安裝（install）、打包（package）、staging、做安裝包

（package_write_ipk）、構建文件系統等。

14.6.9 有錯繼續執行

bitbake-k recipe-name

14.6.10 顯示包的依賴關系

注意必須是發行版包含的包才可以顯示

14.6.11 查看bitbake的版本信息

bitbake--version

14.6.12 bitbake使用說明

bitbake--help