src/sage/features/giac.py: add new feature for the giac program #38672
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In preparation for adding a
--disable-giac
option, we add a new feature that detects the presence of the "giac" executable. We already have a feature forsage.libs.giac
, but that only guards the libgiac interface; we still have code that runs "giac" behind pexpect. This will allow us to skip those tests when giac is not installed.