Show pagesourceOld revisionsBacklinksBack to top × Table of Contents Patching your application: Editing existing files Creating the second patch Conclusion ← Previous Chapter Patching your application: Editing existing files This is the seventh chapter in the “Hello, world!” for OpenWrt article series. At this point, you should've already accomplished the following tasks: Commissioned your development environment Prepared, configured and built the tools and the cross-compilation toolchain Configured the PATH environment variable Created a simple “Hello, world!” application using native compilation tools Created a local package feed for your application Created a package manifest file for your application Included your new package feed into the OpenWrt build system Updated the package index, and installed your package from the feed Built, deployed and tested the application on your target device Migrated your application to use GNU make Tested building your application using GNU make Updated the package manifest to use GNU make as a build tool Prepared the source code, and created a patch to add new files to the package If you missed one or more of these steps, review the previous chapters. Creating the second patch Our first patch that we created in our previous chapter added two new files, and implemented a new function called add. However, this function is not being called yet, so the functionality it provides is going to waste. In order to utilize the functionality, we create an additional patch which modifies the helloworld.c file. First, we prepare the source codes for patching, and create a new patch context: cd /home/buildbot/source make package/helloworld/{clean,prepare} QUILT=1 cd build_dir/target-.../helloworld-1.0/ quilt push -a quilt new 101-use_module.patch Our task is to modify the helloworld.c file, so we issue the following command to add the file into the patch context, and open it for editing: quilt edit helloworld.c Note that since the file already exists, it is not necessary to add the file into the patch context using quilt add. In the previous chapter, we intentionally used this command to highlight the difference between adding a file and editing an existing file. Let's modify the source file to include our header file, and call the new function: helloworld.c #include <stdio.h> #include "functions.h" int main(void) { int result = add(2, 3); printf("\nHello, world!\nThe sum is '%d'", result); return 0; } Save your changes, review them using quilt diff and move them to the patch context using quilt refresh. Finally navigate back to the back to the root folder of the OpenWrt build system and update the package with our new patch. To do so, issue: cd /home/buildbot/source make package/helloworld/update Conclusion In this chapter, we created a second patch that edits existing files in order to take our newly added add function into use. We then finalized the patch and migrated it into the package proper. This concludes the “Hello, world!” for OpenWrt article series. ← Previous Chapter Helloworld overview This website uses cookies. By using the website, you agree with storing cookies on your computer. Also you acknowledge that you have read and understand our Privacy Policy. If you do not agree leave the website.OKMore information about cookies Last modified: 2019/06/10 01:19by johnadriaan