How can I tell gcc not to inline a function?

by

You want the gcc-specific noinline attribute.

This function attribute prevents a
function from being considered for
inlining. If the function does not
have side-effects, there are
optimizations other than inlining that
causes function calls to be optimized
away, although the function call is
live. To keep such calls from being
optimized away, put
asm ("");

Use it like this:

void __attribute__ ((noinline)) foo() 
{
  ...
}

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