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Taken from debian GNU/kFreeBSD.
Regretably, with GCC 4.4 or later this is the only flag combination
I could find that doesn't cause kernel panics CPU triple-faults or
other kind of severe breakage. This is Gentoo Bug #410945.
Clang can use -O2, so we do not force -O1 on it
--- a/sys/conf/kern.pre.mk
+++ b/sys/conf/kern.pre.mk
@@ -41,6 +41,9 @@
.if !empty(COPTFLAGS:M-O[23s]) && empty(COPTFLAGS:M-fno-strict-aliasing)
COPTFLAGS+= -fno-strict-aliasing
.endif
+.if ${CC:T:Mclang} != "clang" && !empty(COPTFLAGS:M-O[23s])
+COPTFLAGS+= -O1
+.endif
.if !defined(NO_CPU_COPTFLAGS)
COPTFLAGS+= ${_CPUCFLAGS}
.endif
--- a/sys/conf/kmod.mk
+++ b/sys/conf/kmod.mk
@@ -91,6 +91,9 @@
.if !empty(CFLAGS:M-O[23s]) && empty(CFLAGS:M-fno-strict-aliasing)
CFLAGS+= -fno-strict-aliasing
.endif
+.if ${CC:T:Mclang} != "clang" && !empty(CFLAGS:M-O[23s])
+CFLAGS+= -O1
+.endif
WERROR?= -Werror
CFLAGS+= ${WERROR}
CFLAGS+= -D_KERNEL
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