Merge commit 'v3.0-rc1' into kbuild/kbuild
[linux-2.6.git] / scripts / Makefile.build
index 282bfb3..a0fd502 100644 (file)
 
 src := $(obj)
 
-.PHONY: __build
+PHONY := __build
 __build:
 
-# Read .config if it exist, otherwise ignore
--include .config
+# Init all relevant variables used in kbuild files so
+# 1) they have correct type
+# 2) they do not inherit any value from the environment
+obj-y :=
+obj-m :=
+lib-y :=
+lib-m :=
+always :=
+targets :=
+subdir-y :=
+subdir-m :=
+EXTRA_AFLAGS   :=
+EXTRA_CFLAGS   :=
+EXTRA_CPPFLAGS :=
+EXTRA_LDFLAGS  :=
+asflags-y  :=
+ccflags-y  :=
+cppflags-y :=
+ldflags-y  :=
+
+subdir-asflags-y :=
+subdir-ccflags-y :=
+
+# Read auto.conf if it exists, otherwise ignore
+-include include/config/auto.conf
+
+include scripts/Kbuild.include
+
+# For backward compatibility check that these variables do not change
+save-cflags := $(CFLAGS)
+
+# The filename Kbuild has precedence over Makefile
+kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
+kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
+include $(kbuild-file)
+
+# If the save-* variables changed error out
+ifeq ($(KBUILD_NOPEDANTIC),)
+        ifneq ("$(save-cflags)","$(CFLAGS)")
+                $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
+        endif
+endif
+
+#
+# make W=... settings
+#
+# W=1 - warnings that may be relevant and does not occur too often
+# W=2 - warnings that occur quite often but may still be relevant
+# W=3 - the more obscure warnings, can most likely be ignored
+#
+# $(call cc-option, -W...) handles gcc -W.. options which
+# are not supported by all versions of the compiler
+ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
+warning-  := $(empty)
+
+warning-1 := -Wextra -Wunused -Wno-unused-parameter
+warning-1 += -Wmissing-declarations
+warning-1 += -Wmissing-format-attribute
+warning-1 += -Wmissing-prototypes
+warning-1 += -Wold-style-definition
+warning-1 += $(call cc-option, -Wmissing-include-dirs)
+warning-1 += $(call cc-option, -Wunused-but-set-variable)
+
+warning-2 := -Waggregate-return
+warning-2 += -Wcast-align
+warning-2 += -Wdisabled-optimization
+warning-2 += -Wnested-externs
+warning-2 += -Wshadow
+warning-2 += $(call cc-option, -Wlogical-op)
+
+warning-3 := -Wbad-function-cast
+warning-3 += -Wcast-qual
+warning-3 += -Wconversion
+warning-3 += -Wpacked
+warning-3 += -Wpadded
+warning-3 += -Wpointer-arith
+warning-3 += -Wredundant-decls
+warning-3 += -Wswitch-default
+warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
+warning-3 += $(call cc-option, -Wvla)
+
+warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+
+ifeq ("$(strip $(warning))","")
+        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
+endif
 
-include $(if $(wildcard $(obj)/Kbuild), $(obj)/Kbuild, $(obj)/Makefile)
+KBUILD_CFLAGS += $(warning)
+endif
 
 include scripts/Makefile.lib
 
@@ -21,7 +108,7 @@ hostprogs-y += $(host-progs)
 endif
 endif
 
-# Do not include host rules unles needed
+# Do not include host rules unless needed
 ifneq ($(hostprogs-y)$(hostprogs-m),)
 include scripts/Makefile.host
 endif
@@ -35,31 +122,6 @@ _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
 endif
 
-
-ifdef EXTRA_TARGETS
-$(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
-endif
-
-ifdef build-targets
-$(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
-endif
-
-ifdef export-objs
-$(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
-endif
-
-ifdef O_TARGET
-$(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
-endif
-
-ifdef L_TARGET
-$(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
-endif
-
-ifdef list-multi
-$(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
-endif
-
 ifndef obj
 $(warning kbuild: Makefile.build is included improperly)
 endif
@@ -70,14 +132,16 @@ ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
 lib-target := $(obj)/lib.a
 endif
 
-ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
+ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
 builtin-target := $(obj)/built-in.o
 endif
 
+modorder-target := $(obj)/modules.order
+
 # We keep a list of all modules in $(MODVERDIR)
 
 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
-        $(if $(KBUILD_MODULES),$(obj-m)) \
+        $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
         $(subdir-ym) $(always)
        @:
 
@@ -92,18 +156,25 @@ ifneq ($(KBUILD_CHECKSRC),0)
   endif
 endif
 
+# Do section mismatch analysis for each module/built-in.o
+ifdef CONFIG_DEBUG_SECTION_MISMATCH
+  cmd_secanalysis = ; scripts/mod/modpost $@
+endif
 
 # Compile C sources (.c)
 # ---------------------------------------------------------------------------
 
 # Default is built-in, unless we know otherwise
-modkern_cflags := $(CFLAGS_KERNEL)
+modkern_cflags =                                          \
+       $(if $(part-of-module),                           \
+               $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
+               $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
 quiet_modtag := $(empty)   $(empty)
 
-$(real-objs-m)        : modkern_cflags := $(CFLAGS_MODULE)
-$(real-objs-m:.o=.i)  : modkern_cflags := $(CFLAGS_MODULE)
-$(real-objs-m:.o=.s)  : modkern_cflags := $(CFLAGS_MODULE)
-$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
+$(real-objs-m)        : part-of-module := y
+$(real-objs-m:.o=.i)  : part-of-module := y
+$(real-objs-m:.o=.s)  : part-of-module := y
+$(real-objs-m:.o=.lst): part-of-module := y
 
 $(real-objs-m)        : quiet_modtag := [M]
 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
@@ -113,7 +184,7 @@ $(real-objs-m:.o=.lst): quiet_modtag := [M]
 $(obj-m)              : quiet_modtag := [M]
 
 # Default for not multi-part modules
-modname = $(*F)
+modname = $(basetarget)
 
 $(multi-objs-m)         : modname = $(modname-multi)
 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
@@ -125,17 +196,32 @@ $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
 
 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
-cmd_cc_s_c       = $(CC) $(c_flags) -S -o $@ $< 
+cmd_cc_s_c       = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
 
-%.s: %.c FORCE
+$(obj)/%.s: $(src)/%.c FORCE
        $(call if_changed_dep,cc_s_c)
 
 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
 cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 
-%.i: %.c FORCE
+$(obj)/%.i: $(src)/%.c FORCE
        $(call if_changed_dep,cc_i_c)
 
+cmd_gensymtypes =                                                           \
+    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
+    $(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH)                              \
+     $(if $(KBUILD_PRESERVE),-p)                                            \
+     -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
+
+quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
+cmd_cc_symtypes_c =                                                         \
+    set -e;                                                                 \
+    $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
+    test -s $@ || rm -f $@
+
+$(obj)/%.symtypes : $(src)/%.c FORCE
+       $(call cmd,cc_symtypes_c)
+
 # C (.c) files
 # The C file is compiled and updated dependency information is generated.
 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
@@ -159,40 +245,69 @@ else
 #   the actual value of the checksum generated by genksyms
 
 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
-cmd_modversions =                                                      \
-       if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then     \
-               $(CPP) -D__GENKSYMS__ $(c_flags) $<                     \
-               | $(GENKSYMS)                                           \
-               > $(@D)/.tmp_$(@F:.o=.ver);                             \
-                                                                       \
-               $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)              \
-                       -T $(@D)/.tmp_$(@F:.o=.ver);                    \
-               rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);        \
-       else                                                            \
-               mv -f $(@D)/.tmp_$(@F) $@;                              \
+cmd_modversions =                                                              \
+       if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
+               $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))    \
+                   > $(@D)/.tmp_$(@F:.o=.ver);                                 \
+                                                                               \
+               $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
+                       -T $(@D)/.tmp_$(@F:.o=.ver);                            \
+               rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
+       else                                                                    \
+               mv -f $(@D)/.tmp_$(@F) $@;                                      \
+       fi;
+endif
+
+ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ifdef BUILD_C_RECORDMCOUNT
+ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
+  RECORDMCOUNT_FLAGS = -w
+endif
+# Due to recursion, we must skip empty.o.
+# The empty.o file is created in the make process in order to determine
+#  the target endianness and word size. It is made before all other C
+#  files, including recordmcount.
+sub_cmd_record_mcount =                                        \
+       if [ $(@) != "scripts/mod/empty.o" ]; then      \
+               $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
+       fi;
+recordmcount_source := $(srctree)/scripts/recordmcount.c \
+                   $(srctree)/scripts/recordmcount.h
+else
+sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
+       "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
+       "$(if $(CONFIG_64BIT),64,32)" \
+       "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
+       "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
+       "$(if $(part-of-module),1,0)" "$(@)";
+recordmcount_source := $(srctree)/scripts/recordmcount.pl
+endif
+cmd_record_mcount =                                            \
+       if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then    \
+               $(sub_cmd_record_mcount)                        \
        fi;
 endif
 
 define rule_cc_o_c
-       $(if $($(quiet)cmd_checksrc),echo '  $($(quiet)cmd_checksrc)';)   \
-       $(cmd_checksrc)                                                   \
-       $(if $($(quiet)cmd_cc_o_c),echo '  $(subst ','\'',$($(quiet)cmd_cc_o_c))';)  \
-       $(cmd_cc_o_c);                                                    \
+       $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
+       $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                            \
        $(cmd_modversions)                                                \
-       scripts/basic/fixdep $(depfile) $@ '$(subst ','\'',$(cmd_cc_o_c))' > $(@D)/.$(@F).tmp;  \
+       $(call echo-cmd,record_mcount)                                    \
+       $(cmd_record_mcount)                                              \
+       scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
+                                                     $(dot-target).tmp;  \
        rm -f $(depfile);                                                 \
-       mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
+       mv -f $(dot-target).tmp $(dot-target).cmd
 endef
 
 # Built-in and composite module parts
-
-%.o: %.c FORCE
+$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
        $(call cmd,force_checksrc)
        $(call if_changed_rule,cc_o_c)
 
 # Single-part modules are special since we need to mark them in $(MODVERDIR)
 
-$(single-used-m): %.o: %.c FORCE
+$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
        $(call cmd,force_checksrc)
        $(call if_changed_rule,cc_o_c)
        @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
@@ -202,27 +317,27 @@ quiet_cmd_cc_lst_c = MKLST   $@
                     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
                                     System.map $(OBJDUMP) > $@
 
-%.lst: %.c FORCE
+$(obj)/%.lst: $(src)/%.c FORCE
        $(call if_changed_dep,cc_lst_c)
 
 # Compile assembler sources (.S)
 # ---------------------------------------------------------------------------
 
-modkern_aflags := $(AFLAGS_KERNEL)
+modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
 
-$(real-objs-m)      : modkern_aflags := $(AFLAGS_MODULE)
-$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
+$(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
+$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
 
 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
 cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $< 
 
-%.s: %.S FORCE
+$(obj)/%.s: $(src)/%.S FORCE
        $(call if_changed_dep,as_s_S)
 
 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 
-%.o: %.S FORCE
+$(obj)/%.o: $(src)/%.S FORCE
        $(call if_changed_dep,as_o_S)
 
 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
@@ -231,9 +346,10 @@ targets += $(extra-y) $(MAKECMDGOALS) $(always)
 # Linker scripts preprocessor (.lds.S -> .lds)
 # ---------------------------------------------------------------------------
 quiet_cmd_cpp_lds_S = LDS     $@
-      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
+      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
+                            -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
 
-%.lds: %.lds.S FORCE
+$(obj)/%.lds: $(src)/%.lds.S FORCE
        $(call if_changed_dep,cpp_lds_S)
 
 # Build the compiled-in targets
@@ -249,8 +365,9 @@ ifdef builtin-target
 quiet_cmd_link_o_target = LD      $@
 # If the list of objects to link is empty, just create an empty built-in.o
 cmd_link_o_target = $(if $(strip $(obj-y)),\
-                     $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
-                     rm -f $@; $(AR) rcs $@)
+                     $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
+                     $(cmd_secanalysis),\
+                     rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
 
 $(builtin-target): $(obj-y) FORCE
        $(call if_changed,link_o_target)
@@ -259,11 +376,24 @@ targets += $(builtin-target)
 endif # builtin-target
 
 #
+# Rule to create modules.order file
+#
+# Create commands to either record .ko file or cat modules.order from
+# a subdirectory
+modorder-cmds =                                                \
+       $(foreach m, $(modorder),                       \
+               $(if $(filter %/modules.order, $m),     \
+                       cat $m;, echo kernel/$m;))
+
+$(modorder-target): $(subdir-ym) FORCE
+       $(Q)(cat /dev/null; $(modorder-cmds)) > $@
+
+#
 # Rule to compile a set of .o files into one .a file
 #
 ifdef lib-target
 quiet_cmd_link_l_target = AR      $@
-cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
+cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
 
 $(lib-target): $(lib-y) FORCE
        $(call if_changed,link_l_target)
@@ -284,10 +414,10 @@ $($(subst $(obj)/,,$(@:.o=-objs)))    \
 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
  
 quiet_cmd_link_multi-y = LD      $@
-cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
+cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
 
 quiet_cmd_link_multi-m = LD [M]  $@
-cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
+cmd_link_multi-m = $(cmd_link_multi-y)
 
 # We would rather have a list of rules like
 #      foo.o: $(foo-objs)
@@ -306,14 +436,14 @@ targets += $(multi-used-y) $(multi-used-m)
 # Descending
 # ---------------------------------------------------------------------------
 
-.PHONY: $(subdir-ym)
+PHONY += $(subdir-ym)
 $(subdir-ym):
        $(Q)$(MAKE) $(build)=$@
 
 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
 # ---------------------------------------------------------------------------
 
-.PHONY: FORCE
+PHONY += FORCE
 
 FORCE:
 
@@ -328,3 +458,8 @@ cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 ifneq ($(cmd_files),)
   include $(cmd_files)
 endif
+
+# Declare the contents of the .PHONY variable as phony.  We keep that
+# information in a variable se we can use it in if_changed and friends.
+
+.PHONY: $(PHONY)