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Understand GCC test process


Hi,
I'm needing to analyze the execution flow of a test, but don't
understand how the test drivers, e.g., gcc-dg.exp or dg.exp, access
the source code of GCC. When a test starts, what is the first function
that is called? How can I know that?
On another note, I observed the execution traces of some tests from
gcc.dg testsuite and I realized that more than 60% of the called
functions are common to all traces of all testes. So, I would like to
confirm if that happens because the drive is the same (dg.exp)? or if
there is a common process across all tests.
Does anyone can clarify the test process of GCC?

Thanks,
Sabrina Souto


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