# Working with GCC’s tunable parameters¶

GCC has numerous tunable parameters, which are integer values, tweakable at the command-line by:

--param <name>=<value>


A detailed description of the current parameters (in GCC 4.6.0) can be seen at http://gcc.gnu.org/onlinedocs/gcc-4.6.0/gcc/Optimize-Options.html#Optimize-Options (search for “–param” on that page; there doesn’t seem to be an anchor to the list)

The parameters are visible from Python scripts using the following API:

gcc.get_parameters()

Returns a dictionary, mapping from the option names to gcc.Parameter instances

class gcc.Parameter
option

(string) The name used with the command-line –param switch to set this value

current_value

(int/long)

default_value

(int/long)

min_value

(int/long) The minimum acceptable value

max_value

(int/long) The maximum acceptable value, if greater than min_value

help

(string) A short description of the option.