Merge commit 'v3.0-rc1' into kbuild/kbuild
[linux-2.6.git] / scripts / Makefile.build
index db38ef4..a0fd502 100644 (file)
@@ -27,12 +27,15 @@ ccflags-y  :=
 cppflags-y :=
 ldflags-y  :=
 
-# Read .config if it exist, otherwise ignore
+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 does not change
+# For backward compatibility check that these variables do not change
 save-cflags := $(CFLAGS)
 
 # The filename Kbuild has precedence over Makefile
@@ -46,6 +49,56 @@ ifeq ($(KBUILD_NOPEDANTIC),)
                 $(error CFLAGS was changed in "$(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
+
+KBUILD_CFLAGS += $(warning)
+endif
+
 include scripts/Makefile.lib
 
 ifdef host-progs
@@ -55,7 +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
@@ -79,7 +132,7 @@ 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
 
@@ -103,18 +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]
@@ -147,14 +207,20 @@ cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 $(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         = \
-               $(CPP) -D__GENKSYMS__ $(c_flags) $<                     \
-               | $(GENKSYMS) -T $@ >/dev/null;                         \
-               test -s $@ || rm -f $@
+cmd_cc_symtypes_c =                                                         \
+    set -e;                                                                 \
+    $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
+    test -s $@ || rm -f $@
 
 $(obj)/%.symtypes : $(src)/%.c FORCE
-       $(call if_changed_dep,cc_symtypes_c)
+       $(call cmd,cc_symtypes_c)
 
 # C (.c) files
 # The C file is compiled and updated dependency information is generated.
@@ -179,18 +245,46 @@ 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) $(if $(KBUILD_SYMTYPES),                  \
-                             -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH)   \
-               > $(@D)/.tmp_$(@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
 
@@ -198,6 +292,8 @@ define rule_cc_o_c
        $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
        $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                            \
        $(cmd_modversions)                                                \
+       $(call echo-cmd,record_mcount)                                    \
+       $(cmd_record_mcount)                                              \
        scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
                                                      $(dot-target).tmp;  \
        rm -f $(depfile);                                                 \
@@ -205,13 +301,13 @@ define rule_cc_o_c
 endef
 
 # Built-in and composite module parts
-$(obj)/%.o: $(src)/%.c FORCE
+$(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): $(obj)/%.o: $(src)/%.c FORCE
+$(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)
@@ -227,10 +323,10 @@ $(obj)/%.lst: $(src)/%.c FORCE
 # 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 $@ $< 
@@ -250,7 +346,8 @@ 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 $@ $<
 
 $(obj)/%.lds: $(src)/%.lds.S FORCE
        $(call if_changed_dep,cpp_lds_S)
@@ -268,8 +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)
@@ -295,7 +393,7 @@ $(modorder-target): $(subdir-ym) FORCE
 #
 ifdef lib-target
 quiet_cmd_link_l_target = AR      $@
-cmd_link_l_target = rm -f $@; $(AR) 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)
@@ -316,7 +414,7 @@ $($(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 = $(cmd_link_multi-y)
@@ -361,7 +459,6 @@ ifneq ($(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.