-#
-# (C) Copyright 2000-2013
-# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier: GPL-2.0+
-#
-
VERSION = 2014
PATCHLEVEL = 10
SUBLEVEL =
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.
-# Do not:
-# o use make's built-in rules and variables
-# (this increases performance and avoids hard-to-debug behaviour);
-# o print "Entering directory ...";
-MAKEFLAGS += -rR --no-print-directory
+# Do not use make's built-in rules and variables
+# (this increases performance and avoids hard-to-debug behaviour);
+MAKEFLAGS += -rR
# Avoid funny character set dependencies
unexport LC_ALL
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC
+# Avoid interference with shell env settings
+unexport GREP_OPTIONS
+
# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# descending is started. They are now explicitly listed as the
# prepare rule.
+# Beautify output
+# ---------------------------------------------------------------------------
+#
+# Normally, we echo the whole command before executing it. By making
+# that echo $($(quiet)$(cmd)), we now have the possibility to set
+# $(quiet) to choose other forms of output instead, e.g.
+#
+# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
+# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
+#
+# If $(quiet) is empty, the whole command will be printed.
+# If it is set to "quiet_", only the short version will be printed.
+# If it is set to "silent_", nothing will be printed at all, since
+# the variable $(silent_cmd_cc_o_c) doesn't exist.
+#
+# A simple variant is to prefix commands with $(Q) - that's useful
+# for commands that shall be hidden in non-verbose mode.
+#
+# $(Q)ln $@ :<
+#
+# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
+# If KBUILD_VERBOSE equals 1 then the above command is displayed.
+#
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands
KBUILD_VERBOSE = 0
endif
-# Call a source code checker (by default, "sparse") as part of the
-# C compilation.
-#
-# Use 'make C=1' to enable checking of only re-compiled files.
-# Use 'make C=2' to enable checking of *all* source files, regardless
-# of whether they are re-compiled or not.
-#
-# See the file "Documentation/sparse.txt" for more details, including
-# where to get the "sparse" utility.
+ifeq ($(KBUILD_VERBOSE),1)
+ quiet =
+ Q =
+else
+ quiet=quiet_
+ Q = @
+endif
-ifeq ("$(origin C)", "command line")
- KBUILD_CHECKSRC = $(C)
+# If the user is running make -s (silent mode), suppress echoing of
+# commands
+
+ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
+ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
+ quiet=silent_
endif
-ifndef KBUILD_CHECKSRC
- KBUILD_CHECKSRC = 0
+else # make-3.8x
+ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
+ quiet=silent_
endif
-
-# Use make M=dir to specify directory of external module to build
-# Old syntax make ... SUBDIRS=$PWD is still supported
-# Setting the environment variable KBUILD_EXTMOD take precedence
-ifdef SUBDIRS
- KBUILD_EXTMOD ?= $(SUBDIRS)
endif
-ifeq ("$(origin M)", "command line")
- KBUILD_EXTMOD := $(M)
-endif
+export quiet Q KBUILD_VERBOSE
# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.
-
# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)
@:
sub-make: FORCE
- $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
- KBUILD_SRC=$(CURDIR) \
- KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
- $(filter-out _all sub-make,$(MAKECMDGOALS))
+ $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
+ -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
# Leave processing to above invocation of make
skip-makefile := 1
# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)
+# Do not print "Entering directory ...",
+# but we want to display it when entering to the output directory
+# so that IDEs/editors are able to understand relative filenames.
+MAKEFLAGS += --no-print-directory
+
+# Call a source code checker (by default, "sparse") as part of the
+# C compilation.
+#
+# Use 'make C=1' to enable checking of only re-compiled files.
+# Use 'make C=2' to enable checking of *all* source files, regardless
+# of whether they are re-compiled or not.
+#
+# See the file "Documentation/sparse.txt" for more details, including
+# where to get the "sparse" utility.
+
+ifeq ("$(origin C)", "command line")
+ KBUILD_CHECKSRC = $(C)
+endif
+ifndef KBUILD_CHECKSRC
+ KBUILD_CHECKSRC = 0
+endif
+
+# Use make M=dir to specify directory of external module to build
+# Old syntax make ... SUBDIRS=$PWD is still supported
+# Setting the environment variable KBUILD_EXTMOD take precedence
+ifdef SUBDIRS
+ KBUILD_EXTMOD ?= $(SUBDIRS)
+endif
+
+ifeq ("$(origin M)", "command line")
+ KBUILD_EXTMOD := $(M)
+endif
+
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
_all: modules
endif
-srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
-objtree := $(CURDIR)
+ifeq ($(KBUILD_SRC),)
+ # building in the source tree
+ srctree := .
+else
+ ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
+ # building in a subdirectory of the source tree
+ srctree := ..
+ else
+ srctree := $(KBUILD_SRC)
+ endif
+endif
+objtree := .
src := $(srctree)
obj := $(objtree)
export KBUILD_MODULES KBUILD_BUILTIN
export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
-# Beautify output
-# ---------------------------------------------------------------------------
-#
-# Normally, we echo the whole command before executing it. By making
-# that echo $($(quiet)$(cmd)), we now have the possibility to set
-# $(quiet) to choose other forms of output instead, e.g.
-#
-# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
-# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
-#
-# If $(quiet) is empty, the whole command will be printed.
-# If it is set to "quiet_", only the short version will be printed.
-# If it is set to "silent_", nothing will be printed at all, since
-# the variable $(silent_cmd_cc_o_c) doesn't exist.
-#
-# A simple variant is to prefix commands with $(Q) - that's useful
-# for commands that shall be hidden in non-verbose mode.
-#
-# $(Q)ln $@ :<
-#
-# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
-# If KBUILD_VERBOSE equals 1 then the above command is displayed.
-
-ifeq ($(KBUILD_VERBOSE),1)
- quiet =
- Q =
-else
- quiet=quiet_
- Q = @
-endif
-
-# 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%,$(MAKEFLAGS)),)
- quiet=silent_
-endif
-endif
-
-export quiet Q KBUILD_VERBOSE
-
# Look for make include files relative to root of kernel src
MAKEFLAGS += --include-dir=$(srctree)
@echo ''
@echo 'Other generic targets:'
@echo ' all - Build all necessary images depending on configuration'
- @echo ' u-boot - Build the bare u-boot'
+ @echo '* u-boot - Build the bare u-boot'
@echo ' dir/ - Build all files in dir and below'
@echo ' dir/file.[oisS] - Build specified target only'
@echo ' dir/file.lst - Build specified mixed source/assembly target only'
@echo ' tags/ctags - Generate ctags file for editors'
@echo ' etags - Generate etags file for editors'
@echo ' cscope - Generate cscope index'
- @echo ' ubootrelease - Output the release version string'
- @echo ' ubootversion - Output the version stored in Makefile'
+ @echo ' ubootrelease - Output the release version string (use with make -s)'
+ @echo ' ubootversion - Output the version stored in Makefile (use with make -s)'
@echo ''
@echo 'Static analysers'
@echo ' checkstack - Generate a list of stack hogs'
projects / oweals / u-boot.git / commitdiff