Platform Builder: Cloning – the Linker is your Friend
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by Bruce Eitman
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Published on Tue, 23 Mar 2010 19:11:09 GMT
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2010/03/24
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I was tasked this week with making a minor change to NetMsgBox() behavior. NetMsgBox() is a little function in NETUI that handles MessageBox() for the Network User Interface.
The obvious solution is to clone the entire NETUI directory from Public\Common\Oak\Drivers (see Platform Builder: Clone Public Code for more on cloning). If you haven’t already, take a minute to look in that folder. There are a lot of files in the folder, but I only needed to modify one function in one of those files. There must be a better way.
Enter the linker.
Instead of cloning the entire folder, here is what I did:
- Create a new folder in my Platform named NETUI (but the name isn’t important)
- Copy the C file that I needed to modify to the new folder, in this case netui.c
- Copy a makefile from one of the other folder (really they are all the same)
- Run Sysgen_capture
- Open a build window (see Platform Builder: Build Tools, Opening a Build Window)
- Change directories to the new folder
- Run “Sysgen_capture netui”
- Rename sources.netui to sources
- Add the C file to sources as SOURCES=netui.c
- Modify the code
- Build the code
- Done
That is it, the functions from my new folder now replace the functions from the Public code and link with the rest to create NETUI.dll.
There is a catches. If you remove any of the functions from the C file, linking will fail because the remaining functions will be found twice.
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