br 694c5455b3 Fix build with GCC 8.1.
GCC 8.1 failed to build LLVM's libc++ when -Wshadow is set,
so lower down WARNS flag to 3.

This is similar to dtc(1) which uses libc++ and sets WARNS to 3.

Approved by:	re (gjb)
Sponsored by:	DARPA, AFRL
2018-10-01 16:16:05 +00:00
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