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diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -51,46 +51,39 @@
.endif # clang
.if ${COMPILER_TYPE} == "gcc"
-# Catch-all for all the things that are in our tree, but for which we're
-# not yet ready for this compiler.
NO_WUNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
+NO_WINFINITE_RECURSION= -Wno-infinite-recursion
+NO_WSTRINGOP_OVERREAD= -Wno-stringop-overread
+# Don't make a lot of these warnings errors since the tree isn't
+# ready for it, or they produce too many false positives that
+# can't be fixed.
CWARNEXTRA?= -Wno-error=address \
-Wno-error=aggressive-loop-optimizations \
+ -Wno-error=alloca-larger-than= \
-Wno-error=array-bounds \
-Wno-error=attributes \
-Wno-error=cast-qual \
-Wno-error=enum-compare \
-Wno-error=int-to-pointer-cast \
-Wno-error=maybe-uninitialized \
+ -Wno-error=memset-elt-size \
-Wno-error=misleading-indentation \
+ -Wno-error=nonnull \
-Wno-error=nonnull-compare \
-Wno-error=overflow \
+ -Wno-error=packed-not-aligned \
-Wno-error=pointer-to-int-cast \
-Wno-error=sequence-point \
-Wno-error=shift-overflow \
+ -Wno-error=stringop-overflow \
-Wno-error=tautological-compare \
-Wno-error=unused-function
-.if ${COMPILER_VERSION} >= 70100
-CWARNEXTRA+= -Wno-error=stringop-overflow
-.endif
-.if ${COMPILER_VERSION} >= 70200
-CWARNEXTRA+= -Wno-error=memset-elt-size
-.endif
-.if ${COMPILER_VERSION} >= 80000
-CWARNEXTRA+= -Wno-error=packed-not-aligned
-.endif
-.if ${COMPILER_VERSION} >= 90100
+
+# These warnings aren't useful, so suppress them.
CWARNEXTRA+= -Wno-address-of-packed-member \
-Wno-alloc-size-larger-than \
- -Wno-error=alloca-larger-than=
-.if ${COMPILER_VERSION} >= 120100
-CWARNEXTRA+= -Wno-error=nonnull \
-Wno-dangling-pointer \
-Wno-zero-length-bounds
-NO_WINFINITE_RECURSION= -Wno-infinite-recursion
-NO_WSTRINGOP_OVERREAD= -Wno-stringop-overread
-.endif
-.endif
# GCC produces false positives for functions that switch on an
# enum (GCC bug 87950)

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