如何构建跨platform,跨product的building system--序

本文探讨了在大型嵌入式Linux产品开发中,如何利用Makefile构建一套能够跨平台、跨产品的编译系统,旨在解决同一份源代码在不同平台和产品上的编译问题,避免代码分支混乱导致的资源共享难题。

转载时请注明出处和作者联系方式:http://blog.youkuaiyun.com/mimepp

作者联系方式:YU TAO <yut616 at sohu dot com>

如何构建跨platform,跨product的building system--序 

在大型的嵌入linux产品的开发中, 会遇到同一份代码, 需要根据不同platform平台, 和不同的目标product来编译出不同的firmware,而且需要保证不同平台不同产品间不相互破坏. 如何做到这个呢, 避免出现在CVS中branch出不同的分支来开发, 导致各分支上开发人员所贡献的代码无法在其他分支上得到共享.
这是一个很重要的问题,对一个产品, 一个项目,乃至多个项目的架构都是至关重要的. 没有这个好的架构, 会导致大量的人力资源的浪费和工作的不断重复,还有开发人员的巨大的挫败感.

从这个序开始,我们可以探讨一下这个话题, 主要会从以下几个方面开始讨论:
1. Makefile中依赖关系讨论---用来保证代码间的依赖
2. Makefile中各个item的含义---基础内容
3. 新Makefile的结构设计
4. 用新Makefile来构建跨platform,跨product的building system
### Janus-Pro-7B for Mac Installation and Usage For the installation of Janus-Pro-7B on a Mac system, it is important to note that specific instructions tailored directly towards this model are not widely documented as compared to more common software packages like MariaDB or standard configurations of Janus Gateway[^1]. However, assuming "Janus-Pro-7B" refers to an advanced version or configuration of the Janus Video Streaming Server with particular optimizations or features (since direct references about "Janus-Pro-7B" are sparse), one can infer general guidelines based on installing and configuring regular versions of Janus Gateway. #### Prerequisites Before proceeding with the installation process, ensure Homebrew is installed on the macOS environment. This package manager simplifies obtaining dependencies required by various applications including potentially customized builds such as what might be referred to as "Janus-Pro-7B". To install Homebrew: ```bash /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" ``` Ensure all necessary development tools are available via Xcode Command Line Tools which can be installed using `xcode-select --install`. #### Installing Dependencies Given that specialized documentation for "Janus-7B" may not exist, follow typical dependency installations needed for building from source similar to other versions of Janus Gateway. Use Homebrew to fetch these prerequisites: ```bash brew update && brew upgrade brew install cmake pkg-config openssl jansson libmicrohttpd sofia-sip glib ``` #### Building From Source Assuming access to the source code repository specifically designed for "Janus-7B", clone the repository into your local machine. If official repositories do not provide a distinct branch or tag named after "Pro-7B", consider reaching out to support channels associated with this product variant for accurate guidance. Once obtained, navigate through terminal commands within the cloned directory structure where build scripts reside: ```bash mkdir build && cd build cmake .. make sudo make install ``` #### Configuration Adjustments After successful compilation and installation, adjust settings according to operational requirements. For instance, setting up WebSocket Secure Port could involve editing configuration files similarly described when dealing with generic instances of Janus Gateway[^2]: ```ini wss_port = 8989 # WebSockets server secure port, if enabled ``` This line would typically appear inside `/usr/local/etc/janus/janus.cfg` or another designated path depending upon how paths were specified during CMake configuration phase. #### Running Services Start services following platform-specific conventions; under macOS, leveraging launchctl daemon management framework allows persistent service operation across reboots without manual intervention each time. Create a plist file at `/Library/LaunchDaemons/org.janus-gateway.plist`, ensuring proper permissions apply (`chown root:wheel /Library/LaunchDaemons/org.janus-gateway.plist`) before loading it into LaunchDaemon context: ```xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>org.janus-gateway</string> <key>ProgramArguments</key> <array> <string>/usr/local/bin/janus</string> </array> <key>RunAtLoad</key> <true/> <!-- Additional keys here --> </dict> </plist> ``` Then load the new job definition: ```bash launchctl bootstrap system /Library/LaunchDaemons/org.janus-gateway.plist ``` --related questions-- 1. What modifications should be made to adapt Janus Gateway's default setup for high-performance video streaming? 2. How does integrating TURN servers enhance real-time communication capabilities provided by Janus Gateway? 3. Can custom plugins extend functionality beyond core offerings in Janus Gateway deployments? 4. In what ways does securing communications impact performance metrics within media gateways like Janus?
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