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Be more tolerant of share/mk and kern.mk mismatch

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When building out-of-tree modules, it appears that the system share/mk
is used, but sys/conf/kern.mk is used.  That results in MK_INIT_ALL_ZERO
being undefined.  In the interest of maximum compatability, check
that MK_INIT_ALL_* and COMPILER_FEATURES are defined before comparing
their values.

Reported by:	mmacy
Sponsored by:	DARPA
This commit is contained in:
Brooks Davis 2020-11-10 21:12:32 +00:00
parent b3ceca0c80
commit d8033dc3d3
1 changed files with 4 additions and 4 deletions

8
sys/conf/kern.mk

@ -230,15 +230,15 @@ CFLAGS+= -mretpoline
#
# Initialize stack variables on function entry
#
.if ${MK_INIT_ALL_ZERO} == "yes"
.if ${COMPILER_FEATURES:Minit-all}
.if defined(MK_INIT_ALL_ZERO) && ${MK_INIT_ALL_ZERO} == "yes"
.if defined(COMPILER_FEATURES) && ${COMPILER_FEATURES:Minit-all}
CFLAGS+= -ftrivial-auto-var-init=zero \
-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
.else
.warning InitAll (zeros) requested but not support by compiler
.endif
.elif ${MK_INIT_ALL_PATTERN} == "yes"
.if ${COMPILER_FEATURES:Minit-all}
.elif defined(MK_INIT_ALL_PATTERN) && ${MK_INIT_ALL_PATTERN} == "yes"
.if defined(COMPILER_FEATURES) && ${COMPILER_FEATURES:Minit-all}
CFLAGS+= -ftrivial-auto-var-init=pattern
.else
.warning InitAll (pattern) requested but not support by compiler