UBUNTU: Ubuntu-4.15.0-96.97

[mirror_ubuntu-bionic-kernel.git] / Makefile

diff --git a/Makefile b/Makefile
index a7c81ec23f261eb0e65cd19bbc9cc4d11739fa5c..e3610a5f3697a9bdbc1b313c10663f49c1be1a2f 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -451,6 +451,7 @@ KBUILD_AFLAGS_MODULE  := -DMODULE
 KBUILD_CFLAGS_MODULE  := -DMODULE
 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 GCC_PLUGINS_CFLAGS :=
+CLANG_FLAGS :=
 
 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
@@ -504,8 +505,8 @@ endif
 
 ifeq ($(cc-name),clang)
 ifneq ($(CROSS_COMPILE),)
-CLANG_FLAGS    := --target=$(notdir $(CROSS_COMPILE:%-=%))
-GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
+CLANG_FLAGS    += --target=$(notdir $(CROSS_COMPILE:%-=%))
+GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 CLANG_FLAGS    += --prefix=$(GCC_TOOLCHAIN_DIR)
 GCC_TOOLCHAIN  := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 endif
@@ -513,6 +514,7 @@ ifneq ($(GCC_TOOLCHAIN),)
 CLANG_FLAGS    += --gcc-toolchain=$(GCC_TOOLCHAIN)
 endif
 CLANG_FLAGS    += -no-integrated-as
+CLANG_FLAGS    += -Werror=unknown-warning-option
 KBUILD_CFLAGS  += $(CLANG_FLAGS)
 KBUILD_AFLAGS  += $(CLANG_FLAGS)
 export CLANG_FLAGS
@@ -678,11 +680,11 @@ KBUILD_CFLAGS     += $(call cc-disable-warning,frame-address,)
 KBUILD_CFLAGS  += $(call cc-disable-warning, format-truncation)
 KBUILD_CFLAGS  += $(call cc-disable-warning, format-overflow)
 KBUILD_CFLAGS  += $(call cc-disable-warning, int-in-bool-context)
+KBUILD_CFLAGS  += $(call cc-disable-warning, address-of-packed-member)
 KBUILD_CFLAGS  += $(call cc-disable-warning, attribute-alias)
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS  += $(call cc-option,-Oz,-Os)
-KBUILD_CFLAGS  += $(call cc-disable-warning,maybe-uninitialized,)
+KBUILD_CFLAGS  += -Os $(call cc-disable-warning,maybe-uninitialized,)
 else
 ifdef CONFIG_PROFILE_ALL_BRANCHES
 KBUILD_CFLAGS  += -O2 $(call cc-disable-warning,maybe-uninitialized,)
@@ -746,7 +748,6 @@ ifeq ($(cc-name),clang)
 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 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)
 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
@@ -868,6 +869,15 @@ KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 # Require designated initializers for all marked structures
 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 
+# ensure -fcf-protection is disabled when using retpoline as it is
+# incompatible with -mindirect-branch=thunk-extern
+ifdef CONFIG_RETPOLINE
+KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
+endif
+
+# change __FILE__ to the relative path from the srctree
+KBUILD_CFLAGS  += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
+
 # use the deterministic mode of AR if available
 KBUILD_ARFLAGS := $(call ar-option,D)
 
@@ -990,6 +1000,7 @@ ifdef CONFIG_STACK_VALIDATION
   endif
 endif
 
+PHONY += prepare0
 
 ifeq ($(KBUILD_EXTMOD),)
 core-y         += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
@@ -1084,8 +1095,7 @@ include/config/kernel.release: include/config/auto.conf FORCE
 # archprepare is used in arch Makefiles and when processed asm symlink,
 # version.h and scripts_basic is processed / created.
 
-# Listed in dependency order
-PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
+PHONY += prepare archprepare prepare1 prepare2 prepare3
 
 # prepare3 is used to check if we are building in a separate output directory,
 # and if so do:
@@ -1552,9 +1562,6 @@ else # KBUILD_EXTMOD
 
 # We are always building modules
 KBUILD_MODULES := 1
-PHONY += crmodverdir
-crmodverdir:
-       $(cmd_crmodverdir)
 
 PHONY += $(objtree)/Module.symvers
 $(objtree)/Module.symvers:
@@ -1566,7 +1573,7 @@ $(objtree)/Module.symvers:
 
 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
 PHONY += $(module-dirs) modules
-$(module-dirs): crmodverdir $(objtree)/Module.symvers
+$(module-dirs): prepare $(objtree)/Module.symvers
        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
 
 modules: $(module-dirs)
@@ -1607,7 +1614,8 @@ help:
 
 # Dummies...
 PHONY += prepare scripts
-prepare: ;
+prepare:
+       $(cmd_crmodverdir)
 scripts: ;
 endif # KBUILD_EXTMOD
 
@@ -1733,17 +1741,14 @@ endif
 
 # Modules
 /: prepare scripts FORCE
-       $(cmd_crmodverdir)
        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
        $(build)=$(build-dir)
 # Make sure the latest headers are built for Documentation
 Documentation/ samples/: headers_install
 %/: prepare scripts FORCE
-       $(cmd_crmodverdir)
        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
        $(build)=$(build-dir)
 %.ko: prepare scripts FORCE
-       $(cmd_crmodverdir)
        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
        $(build)=$(build-dir) $(@:.ko=.o)
        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost