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Quick tutorial about how to quickly start using ICI and plugins:

ICI plugins are simply shared object files with distinguished functions:

  • in mainstream ICI and the GCC 4.2.4 backport, the name and location of the plugin is specified by the value of the environment variable "ICI_PLUGIN"; plugin support is activated using either the "-fici" flag, or by setting the environment variable "ICI_USE" to value 1. The plugin must define at least the following parameter- and result-less functions:
    • the initialisation function "void start(void)",
    • the termination (cleanup) function "void stop(void)".
  • in the GCC plugin flavour, the plugin is specified by means of the flag "-fplugin=<filepath>". Only the initialisation function "plugin_init must be defined, with the following signature: "int plugin_init(char plugin_name, int argc, plugin_arg *argv)".

For a quickstart:

  • download the sources for the ICI flaviour you need/prefer (see here)
  • build the compiler (the instructions assume that you have a working GCC on your platform):
    • for ICI mainline ("master" branch) and GCC plugin compatibility mode ("gcc-submission" branch), cd to the "mainline" directory and run the script "_build_all.sh" located in that directory (typically, do "./_build_all.sh")
    • for ICI gcc-4.2.4 backport, build the GCC as usual (create a build directory - preferably outside the ICI source tree, cd to that directory, configure GCC with an installation prefix to which you have write permissions, build and install); no special flags are necessary;
  • cd to directory "mainline/plugins/examples/trivial"
  • run "make"; this will generate the plugin file "trivial.so" in the current direcory;
  • invoke the plugin-capable GCC on the "trivial.c" source file with the newly generated plugin (we assume the default installation path of new GCC as coded in the script "_build_all.sh"):
# ICI mainline - use -fici or ICI_USE=1 to enable plugins, and ICI_PLUGIN to select the plugin file
me@mymachine:trivial$  export ICI_PLUGIN=./trivial.so
me@mymachine:trivial$  ../../../../install-x8664/bin/gcc -fici -I../../include -c trivial.c
... output from the plugin ...
me@mymachine:trivial$  export ICI_USE=1 ; ../../../../install-x8664/bin/gcc -I../../include -c trivial.c
... output from the plugin ...
# ICI in the GCC plugins-branch flavour: use -fplugin=
me@mymachine:trivial$  ../../../../install-x8664/bin/gcc -fplugin=./trivial.so -I../../include -c trivial.c
  • to increase plugin verbosity in ICI mainline and gcc-4.2.4 mode, set the environment variable "ICI_PLUGIN_VERBOSE" to a non-empty value:
# this feature is only available with ICI mainline (branch "master") and gcc-4.2.4 (branch "gccc-4.2.4")
me@mymachine:trivial$  ../../../../install-x8664/bin/gcc -fici -I../../include -c trivial.c
... very verbose output from the plugin ...

If you got thus far, congratulations! You have built and run your first ICI plugin(s)!

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