KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
&& /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
- $(error output directory "$(saved-output)" does not exist))
+ $(error failed to create output directory "$(saved-output)"))
PHONY += $(MAKECMDGOALS) sub-make
else echo sh; fi ; fi)
HOSTCC = gcc
+HOSTCXX = g++
HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
+HOSTCXXFLAGS = -O2
+
+ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
+HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
+ -Wno-missing-field-initializers -fno-delete-null-pointer-checks
+endif
ifeq ($(HOSTOS),cygwin)
HOSTCFLAGS += -ansi
# If the user is running make -s (silent mode), suppress echoing of
# commands
+ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
+ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
+ quiet=silent_
+endif
+else # make-3.8x
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
quiet=silent_
endif
+endif
export quiet Q KBUILD_VERBOSE
+ifneq ($(CC),)
+ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
+COMPILER := clang
+else
+COMPILER := gcc
+endif
+export COMPILER
+endif
# Look for make include files relative to root of kernel src
MAKEFLAGS += --include-dir=$(srctree)
# Files to ignore in find ... statements
-RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
- -o -name .pc -o -name .hg -o -name .git \) -prune -o
+export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
+ -name CVS -o -name .pc -o -name .hg -o -name .git \) \
+ -prune -o
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
--exclude CVS --exclude .pc --exclude .hg --exclude .git
KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
+ifeq ($(COMPILER),clang)
+KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
+KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
+KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
+KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
+# 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
+# source of a reference will be _MergedGlobals and not on of the whitelisted names.
+# See modpost pattern 2
+KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
+endif
+
KBUILD_CFLAGS += -g
# $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
# option to the assembler.
export CONFIG_SYS_TEXT_BASE
+# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
+KBUILD_CPPFLAGS += $(KCPPFLAGS)
+KBUILD_AFLAGS += $(KAFLAGS)
+KBUILD_CFLAGS += $(KCFLAGS)
+
# Use UBOOTINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
UBOOTINCLUDE := \
@echo '*** Warning: make $@ is unnecessary now.'
# ---------------------------------------------------------------------------
-quiet_cmd_cpp_lds = LDS $@
-cmd_cpp_lds = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
- -D__ASSEMBLY__ -x assembler-with-cpp -P -o $@ $<
+define filechk_ubootlds
+ ($(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
+ -D__ASSEMBLY__ -x assembler-with-cpp -P -o - -)
+endef
u-boot.lds: $(LDSCRIPT) prepare FORCE
- $(call if_changed_dep,cpp_lds)
+ $(call filechk,ubootlds)
PHONY += nand_spl
nand_spl: prepare
CLOBBER_FILES += u-boot* MLO* SPL System.map nand_spl/u-boot*
# Directories & files removed with 'make mrproper'
-MRPROPER_DIRS += include/config include/generated
+MRPROPER_DIRS += include/config include/generated \
+ .tmp_objdiff
MRPROPER_FILES += .config .config.old \
tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
include/config.h include/config.mk
@find $(srctree) $(RCS_FIND_IGNORE) \
\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
- -o -name '.*.rej' -o -name '*.pyc' \
- -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
+ -o -name '.*.rej' -o -name '*%' -o -name 'core' \
+ -o -name '*.pyc' \) \
-type f -print | xargs rm -f
backup: