# SPDX-License-Identifier: GPL-2.0
VERSION = 4
-PATCHLEVEL = 15
+PATCHLEVEL = 16
SUBLEVEL = 0
-EXTRAVERSION =
+EXTRAVERSION = -rc1
NAME = Fearless Coyote
# *DOCUMENTATION*
# This selects the stack protector compiler flag. Testing it is delayed
# until after .config has been reprocessed, in the prepare-compiler-check
# target.
+ifdef CONFIG_CC_STACKPROTECTOR_AUTO
+ stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
+ stackp-name := AUTO
+else
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
stackp-flag := -fstack-protector
stackp-name := REGULAR
stackp-flag := -fstack-protector-strong
stackp-name := STRONG
else
+ # If either there is no stack protector for this architecture or
+ # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
+ # is empty, skipping all remaining stack protector tests.
+ #
# Force off for distro compilers that enable stack protector by default.
- stackp-flag := $(call cc-option, -fno-stack-protector)
+ KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
+endif
endif
endif
# Find arch-specific stack protector compiler sanity-checking script.
-ifdef CONFIG_CC_STACKPROTECTOR
+ifdef stackp-name
+ifneq ($(stackp-flag),)
stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
stackp-check := $(wildcard $(stackp-path))
# If the wildcard test matches a test script, run it to check functionality.
stackp-broken := y
endif
endif
+ ifndef stackp-broken
+ # If the stack protector is functional, enable code that depends on it.
+ KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
+ # Either we've already detected the flag (for AUTO) or we'll fail the
+ # build in the prepare-compiler-check rule (for specific flag).
+ KBUILD_CFLAGS += $(stackp-flag)
+ else
+ # We have to make sure stack protector is unconditionally disabled if
+ # the compiler is broken (in case we're going to continue the build in
+ # AUTO mode).
+ KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
+ endif
+endif
endif
-KBUILD_CFLAGS += $(stackp-flag)
ifeq ($(cc-name),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
endif
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
ifdef CONFIG_FRAME_POINTER
KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
else
prepare-compiler-check: FORCE
# Make sure compiler supports requested stack protector flag.
ifdef stackp-name
+ # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
+ ifeq ($(stackp-flag),)
+ @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
+ Compiler does not support any known stack-protector >&2
+ else
+ # Fail if specifically requested stack protector is missing.
ifeq ($(call cc-option, $(stackp-flag)),)
@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
$(stackp-flag) not supported by compiler >&2 && exit 1
endif
+ endif
endif
-# Make sure compiler does not have buggy stack-protector support.
+# Make sure compiler does not have buggy stack-protector support. If a
+# specific stack-protector was requested, fail the build, otherwise warn.
ifdef stackp-broken
+ ifeq ($(stackp-name),AUTO)
+ @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
+ $(stackp-flag) available but compiler is broken: disabling >&2
+ else
@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
$(stackp-flag) available but compiler is broken >&2 && exit 1
+ endif
endif
@: