RR <rrsacct@xxxxxxxxx> writes:
> I think I understand what you are saying regarding -E, but given that,
> ccache would still have to determine whether the language in question
> was preprocessed. Does invoking gcc somehow signal to ccache that it
> is preprocessed? How does it do that?
That's how ccache works: by preprocessing. Read the "How it Works"
section of the ccache man page.
The basic idea is to detect when you are compiling exactly the same code
a 2nd time and use the previously compiled output. You detect that it is
the same code by forming a hash of:
o the pre-processor output from running the compiler with -E
o the command line options
o the real compilers size and modification time
o any stderr output generated by the compiler
Ian
