meta: only check for the C++ compiler when needed #6
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This avoids the check when it is unnecessary, as that might be unwanted in some cases. For instance, using
subproject("bragi")
would trigger the check, even if the intent is only to get the dependency to pull in the support headers, where no compiler is necessary. This becomes relevant when buildingmlibc-headers
, as that is required for building a cross-gcc, and as such has no cross-gcc available.