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-rw-r--r--Makefile239
1 files changed, 200 insertions, 39 deletions
diff --git a/Makefile b/Makefile
index 1409c8b..4f00f08 100644
--- a/Makefile
+++ b/Makefile
@@ -43,6 +43,78 @@ else
XECHO = :
endif
+# *DOCUMENTATION*
+# To see a list of typical targets execute "make help"
+# More info can be located in ./README
+# 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
+
+# Avoid funny character set dependencies
+unexport LC_ALL
+LC_COLLATE=C
+LC_NUMERIC=C
+export LC_COLLATE LC_NUMERIC
+
+# We are using a recursive build, so we need to do a little thinking
+# to get the ordering right.
+#
+# Most importantly: sub-Makefiles should only ever modify files in
+# their own directory. If in some directory we have a dependency on
+# a file in another dir (which doesn't happen often, but it's often
+# unavoidable when linking the built-in.o targets which finally
+# turn into vmlinux), we will call a sub make in that other dir, and
+# after that we are sure that everything which is in that other dir
+# is now up to date.
+#
+# The only cases where we need to modify files which have global
+# effects are thus separated out and done before the recursive
+# descending is started. They are now explicitly listed as the
+# prepare rule.
+
+# To put more focus on warnings, be less verbose as default
+# Use 'make V=1' to see the full commands
+
+ifeq ("$(origin V)", "command line")
+ KBUILD_VERBOSE = $(V)
+endif
+ifndef KBUILD_VERBOSE
+ KBUILD_VERBOSE = 0
+endif
+
+# Call a source code checker (by default, "sparse") as part of the
+# C compilation.
+#
+# Use 'make C=1' to enable checking of only re-compiled files.
+# Use 'make C=2' to enable checking of *all* source files, regardless
+# of whether they are re-compiled or not.
+#
+# See the file "Documentation/sparse.txt" for more details, including
+# where to get the "sparse" utility.
+
+ifeq ("$(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 := $(M)
+endif
+
# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
@@ -107,8 +179,14 @@ endif # ifeq ($(KBUILD_SRC),)
# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)
+# If building an external module we do not care about the all: rule
+# but instead _all depend on modules
PHONY += all
+ifeq ($(KBUILD_EXTMOD),)
_all: all
+else
+_all: modules
+endif
srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
objtree := $(CURDIR)
@@ -119,24 +197,6 @@ VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
export srctree objtree VPATH
-# Call a source code checker (by default, "sparse") as part of the
-# C compilation.
-#
-# Use 'make C=1' to enable checking of re-compiled files.
-#
-# See the linux kernel file "Documentation/sparse.txt" for more details,
-# including where to get the "sparse" utility.
-
-ifdef C
-ifeq ("$(origin C)", "command line")
-CHECKSRC := $(C)
-endif
-endif
-ifndef CHECKSRC
- CHECKSRC = 0
-endif
-export CHECKSRC
-
OBJTREE := $(objtree)
SPLTREE := $(OBJTREE)/spl
TPLTREE := $(OBJTREE)/tpl
@@ -222,6 +282,78 @@ HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp")
HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")
endif
+# Decide whether to build built-in, modular, or both.
+# Normally, just do built-in.
+
+KBUILD_MODULES :=
+KBUILD_BUILTIN := 1
+
+# If we have only "make modules", don't compile built-in objects.
+# When we're building modules with modversions, we need to consider
+# the built-in objects during the descend as well, in order to
+# make sure the checksums are up to date before we record them.
+
+ifeq ($(MAKECMDGOALS),modules)
+ KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
+endif
+
+# If we have "make <whatever> modules", compile modules
+# in addition to whatever we do anyway.
+# Just "make" or "make all" shall build modules as well
+
+# U-Boot does not need modules
+#ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
+# KBUILD_MODULES := 1
+#endif
+
+#ifeq ($(MAKECMDGOALS),)
+# KBUILD_MODULES := 1
+#endif
+
+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 ($(filter s% -s%,$(MAKEFLAGS)),)
+ quiet=silent_
+endif
+
+export quiet Q KBUILD_VERBOSE
+
+
# Look for make include files relative to root of kernel src
MAKEFLAGS += --include-dir=$(srctree)
@@ -278,6 +410,31 @@ export DTC CHECK CHECKFLAGS
export KBUILD_CPPFLAGS NOSTDINC_FLAGS UBOOTINCLUDE
export KBUILD_CFLAGS KBUILD_AFLAGS
+# When compiling out-of-tree modules, put MODVERDIR in the module
+# tree rather than in the kernel tree. The kernel tree might
+# even be read-only.
+export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
+
+# 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_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
+ --exclude CVS --exclude .pc --exclude .hg --exclude .git
+
+# ===========================================================================
+# Rules shared between *config targets and build targets
+
+# Basic helpers built in scripts/
+PHONY += scripts_basic
+scripts_basic:
+ $(Q)$(MAKE) $(build)=scripts/basic
+ $(Q)rm -f .tmp_quiet_recordmcount
+
+# To avoid any implicit rule to kick in, define an empty command.
+scripts/basic/%: scripts_basic ;
+
+
KBUILD_CFLAGS += -Os #-fomit-frame-pointer
ifdef BUILD_TAG
@@ -333,6 +490,10 @@ endif
endif
endif
+# FIX ME
+cpp_flags := $(KBUILD_CPPFLAGS) $(CPPFLAGS) $(UBOOTINCLUDE) $(NOSTDINC_FLAGS)
+c_flags := $(KBUILD_CFLAGS) $(cpp_flags)
+
# If board code explicitly specified LDSCRIPT or CONFIG_SYS_LDSCRIPT, use
# that (or fail if absent). Otherwise, search for a linker script in a
# standard location.
@@ -446,12 +607,12 @@ LIBS := $(sort $(LIBS-y))
# Add GCC lib
ifdef USE_PRIVATE_LIBGCC
ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
-PLATFORM_LIBGCC = $(OBJTREE)/arch/$(ARCH)/lib/libgcc.o
+PLATFORM_LIBGCC = $(OBJTREE)/arch/$(ARCH)/lib/lib.a
else
PLATFORM_LIBGCC = -L $(USE_PRIVATE_LIBGCC) -lgcc
endif
else
-PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(CFLAGS) -print-libgcc-file-name`) -lgcc
+PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(c_flags) -print-libgcc-file-name`) -lgcc
endif
PLATFORM_LIBS += $(PLATFORM_LIBGCC)
export PLATFORM_LIBS
@@ -701,7 +862,7 @@ u-boot: depend $(SUBDIR_TOOLS) $(OBJS) $(LIBS) u-boot.lds
ifeq ($(CONFIG_KALLSYMS),y)
smap=`$(call SYSTEM_MAP,u-boot) | \
awk '$$2 ~ /[tTwW]/ {printf $$1 $$3 "\\\\000"}'` ; \
- $(CC) $(CFLAGS) -DSYSTEM_MAP="\"$${smap}\"" \
+ $(CC) $(c_flags) -DSYSTEM_MAP="\"$${smap}\"" \
-c $(srctree)/common/system_map.c -o common/system_map.o
$(GEN_UBOOT) common/system_map.o
endif
@@ -709,27 +870,27 @@ endif
$(OBJS):
@:
-$(LIBS): depend $(SUBDIR_TOOLS)
- $(MAKE) $(build)=$(patsubst %/,%,$(dir $@))
+$(LIBS): depend $(SUBDIR_TOOLS) scripts_basic
+ $(Q)$(MAKE) $(build)=$(patsubst %/,%,$(dir $@))
-$(SUBDIRS): depend
- $(MAKE) $(build)=$@ all
+$(SUBDIRS): depend scripts_basic
+ $(Q)$(MAKE) $(build)=$@
$(SUBDIR_EXAMPLES-y): u-boot
u-boot.lds: $(LDSCRIPT) depend
- $(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$< >$@
+ $(CPP) $(cpp_flags) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$< >$@
-nand_spl: $(TIMESTAMP_FILE) $(VERSION_FILE) depend
+nand_spl: $(TIMESTAMP_FILE) $(VERSION_FILE) depend scripts_basic
$(MAKE) $(build)=nand_spl/board/$(BOARDDIR) all
u-boot-nand.bin: nand_spl u-boot.bin
cat nand_spl/u-boot-spl-16k.bin u-boot.bin > u-boot-nand.bin
-spl/u-boot-spl.bin: $(SUBDIR_TOOLS) depend
+spl/u-boot-spl.bin: $(SUBDIR_TOOLS) depend scripts_basic
$(MAKE) obj=spl -f $(srctree)/spl/Makefile all
-tpl/u-boot-tpl.bin: $(SUBDIR_TOOLS) depend
+tpl/u-boot-tpl.bin: $(SUBDIR_TOOLS) depend scripts_basic
$(MAKE) obj=tpl -f $(srctree)/spl/Makefile all CONFIG_TPL_BUILD=y
# Explicitly make _depend in subdirs containing multiple targets to prevent
@@ -804,14 +965,14 @@ checkdtc:
include/autoconf.mk.dep: include/config.h include/common.h
@$(XECHO) Generating $@ ; \
: Generate the dependancies ; \
- $(CC) -x c -DDO_DEPS_ONLY -M $(CFLAGS) $(CPPFLAGS) \
+ $(CC) -x c -DDO_DEPS_ONLY -M $(c_flags) \
-MQ include/autoconf.mk $(srctree)/include/common.h > $@ || \
rm $@
include/autoconf.mk: include/config.h
@$(XECHO) Generating $@ ; \
: Extract the config macros ; \
- $(CPP) $(CFLAGS) -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
+ $(CPP) $(c_flags) -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
rm $@.tmp
@@ -819,7 +980,7 @@ include/autoconf.mk: include/config.h
include/tpl-autoconf.mk: include/config.h
@$(XECHO) Generating $@ ; \
: Extract the config macros ; \
- $(CPP) $(CFLAGS) -DCONFIG_TPL_BUILD -DCONFIG_SPL_BUILD\
+ $(CPP) $(c_flags) -DCONFIG_TPL_BUILD -DCONFIG_SPL_BUILD\
-DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
rm $@.tmp
@@ -827,7 +988,7 @@ include/tpl-autoconf.mk: include/config.h
include/spl-autoconf.mk: include/config.h
@$(XECHO) Generating $@ ; \
: Extract the config macros ; \
- $(CPP) $(CFLAGS) -DCONFIG_SPL_BUILD -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
+ $(CPP) $(c_flags) -DCONFIG_SPL_BUILD -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
rm $@.tmp
@@ -838,7 +999,7 @@ include/generated/generic-asm-offsets.h: lib/asm-offsets.s
lib/asm-offsets.s: include/config.h $(srctree)/lib/asm-offsets.c
@mkdir -p lib
$(CC) -DDO_DEPS_ONLY \
- $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
+ $(c_flags) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
-o $@ $(srctree)/lib/asm-offsets.c -c -S
include/generated/asm-offsets.h: $(CPUDIR)/$(SOC)/asm-offsets.s
@@ -849,7 +1010,7 @@ $(CPUDIR)/$(SOC)/asm-offsets.s: include/config.h
@mkdir -p $(CPUDIR)/$(SOC)
if [ -f $(srctree)/$(CPUDIR)/$(SOC)/asm-offsets.c ];then \
$(CC) -DDO_DEPS_ONLY \
- $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
+ $(c_flags) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
-o $@ $(srctree)/$(CPUDIR)/$(SOC)/asm-offsets.c -c -S; \
else \
touch $@; \
@@ -900,15 +1061,15 @@ $(TIMESTAMP_FILE):
@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
easylogo env gdb:
- $(MAKE) $(build)=tools/$@ MTD_VERSION=${MTD_VERSION}
+ $(Q)$(MAKE) $(build)=tools/$@ MTD_VERSION=${MTD_VERSION}
gdbtools: gdb
xmldocs pdfdocs psdocs htmldocs mandocs: tools/kernel-doc/docproc
- $(MAKE) U_BOOT_VERSION=$(U_BOOT_VERSION) $(build)=doc/DocBook $@
+ $(Q)$(MAKE) U_BOOT_VERSION=$(U_BOOT_VERSION) $(build)=doc/DocBook $@
tools-all: easylogo env gdb $(VERSION_FILE) $(TIMESTAMP_FILE)
- $(MAKE) $(build)=tools HOST_TOOLS_ALL=y
+ $(Q)$(MAKE) $(build)=tools HOST_TOOLS_ALL=y
.PHONY : CHANGELOG
CHANGELOG:
@@ -968,7 +1129,7 @@ clean:
@$(MAKE) -f $(srctree)/doc/DocBook/Makefile cleandocs
@find $(OBJTREE) -type f \
\( -name 'core' -o -name '*.bak' -o -name '*~' -o -name '*.su' \
- -o -name '*.o' -o -name '*.a' -o -name '*.exe' \
+ -o -name '*.o' -o -name '*.a' -o -name '*.exe' -o -name '*.cmd' \
-o -name '*.cfgtmp' \) -print \
| xargs rm -f
generated by cgit v1.1 at 2024-12-29 15:12:10 +0000