Clearly an update was necessary. Unfortunately, later versions of gcc have switched to GPLv3, which is a viral license and unacceptable to the FreeBSD project.
wasn't aware of that.
Therefore clang was chosen from amongst a number of alternatives as the best replacement. That makes it sound as if clang is a second class option compared to recent gcc, but this is certainly not the case: results from clang are comparable to the latest gcc versions and the design of clang is such that further optimizations and improvements can be readily incorporated.
and - at least for now - clang itself is very slow. But produces not worse (or better) code than gcc.
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