Merge tag 'var-init-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...

[sfrench/cifs-2.6.git] / Makefile

diff --git a/Makefile b/Makefile
index aef9ca61caf05fc0e0542e86a8d58950c096e793..09c1bd1fcb644581b097e4711004e010b1effc61 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -803,11 +803,20 @@ KBUILD_CFLAGS     += -fomit-frame-pointer
 endif
 endif
 
-# Initialize all stack variables with a pattern, if desired.
-ifdef CONFIG_INIT_STACK_ALL
+# Initialize all stack variables with a 0xAA pattern.
+ifdef CONFIG_INIT_STACK_ALL_PATTERN
 KBUILD_CFLAGS  += -ftrivial-auto-var-init=pattern
 endif
 
+# Initialize all stack variables with a zero value.
+ifdef CONFIG_INIT_STACK_ALL_ZERO
+# Future support for zero initialization is still being debated, see
+# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
+# renamed or dropped.
+KBUILD_CFLAGS  += -ftrivial-auto-var-init=zero
+KBUILD_CFLAGS  += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
+endif
+
 DEBUG_CFLAGS   := $(call cc-option, -fno-var-tracking-assignments)
 
 ifdef CONFIG_DEBUG_INFO