- gcc(1) fails to build usr.bin/dtc
- lack of WITH_GNUCXX=1 causes cc1plus(1) calls to fail
- u-boot fails to build with clang (hard-coded gcc(1) calls)
Implement the proper incantation of WITH_/WITHOUT_ knobs
to get arm snapshot builds working again.
Since the cc(1) binary is no longer expected to be clang(1),
remove the chroot(8) post-install cc(1) overwrite.
MFC After: 3 days
X-MFC-With: r264518,r264697,r264698
Tested on: stable/10@r264677 RPI-B
Sponsored by: The FreeBSD Foundation
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