Yes, I am experimenting with GCC 4.1.2 but later will love to work on plugins. I was able to write a simple GCC pass to print the below message: Linux:>/x/local/prakash_prasad/gcc-4.1.2/temp/usr/local/bin 1049> ./g++ test.cpp This is a test message. Linux:>/x/local/prakash_prasad/gcc-4.1.2/temp/usr/local/bin 1050> And below is my new pass structure declaration: struct my_new_gcc_pass = { "my_pass", NULL, my_execute, NULL, NULL, 0, 0, 0, 0, 0, 0, 0, 0 }; Basically in my_execute method I have a fprintf stdout call. My knowledge about GCC pass is at 0th level or mere - I would like to learn more and implement my requirement - please let me know where can I get details of how to add printf statements of type I had mentioned earlier. Regards, Prakash On Tue, Feb 14, 2012 at 12:36 PM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 14 February 2012 20:33, Satya Prakash Prasad wrote: >> Sorry I am just a beginner. It should be a new GCC pass. > > Then if you're not planning to write it as a plugin you don't need to > use GCC 4.5 or later. > > You could write a new pass for GCC 4.1, but it's not easy.