diff options
Diffstat (limited to 'scripts/Makefile.build')
| -rw-r--r-- | scripts/Makefile.build | 131 |
1 files changed, 77 insertions, 54 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index ae9cf740633e..a9e47953ca53 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -52,6 +52,13 @@ ifndef obj $(warning kbuild: Makefile.build is included improperly) endif +ifeq ($(need-modorder),) +ifneq ($(obj-m),) +$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) +$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) +endif +endif + # =========================================================================== ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) @@ -63,16 +70,11 @@ ifneq ($(strip $(real-obj-y) $(need-builtin)),) builtin-target := $(obj)/built-in.a endif -ifdef CONFIG_MODULES +ifeq ($(CONFIG_MODULES)$(need-modorder),y1) modorder-target := $(obj)/modules.order endif -# We keep a list of all modules in $(MODVERDIR) - -__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ - $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ - $(subdir-ym) $(always) - @: +mod-targets := $(patsubst %.o, %.mod, $(obj-m)) # Linus' kernel sanity checking tool ifeq ($(KBUILD_CHECKSRC),1) @@ -83,28 +85,13 @@ else ifeq ($(KBUILD_CHECKSRC),2) cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< endif -ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) +ifneq ($(KBUILD_EXTRA_WARN),) cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< endif -# Do section mismatch analysis for each module/built-in.a -ifdef CONFIG_DEBUG_SECTION_MISMATCH - cmd_secanalysis = ; scripts/mod/modpost $@ -endif - # Compile C sources (.c) # --------------------------------------------------------------------------- -# Default is built-in, unless we know otherwise -$(foreach x, i ll lst o s symtypes, $(patsubst %.o,%.$(x),$(real-obj-m))): \ - part-of-module := y - -modkern_cflags = \ - $(if $(part-of-module), \ - $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ - $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) -quiet_modtag = $(if $(part-of-module),[M], ) - quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< @@ -268,7 +255,7 @@ endef # List module undefined symbols (or empty line if not enabled) ifdef CONFIG_TRIM_UNUSED_KSYMS -cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo +cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | xargs echo else cmd_undef_syms = echo endif @@ -278,13 +265,15 @@ $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) 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) +cmd_mod = { \ + echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \ + $(cmd_undef_syms); \ + } > $@ -$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE - $(call cmd,force_checksrc) - $(call if_changed_rule,cc_o_c) - @{ echo $(@:.o=.ko); echo $@; \ - $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) +$(obj)/%.mod: $(obj)/%.o FORCE + $(call if_changed,mod) + +targets += $(mod-targets) quiet_cmd_cc_lst_c = MKLST $@ cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ @@ -294,13 +283,17 @@ quiet_cmd_cc_lst_c = MKLST $@ $(obj)/%.lst: $(src)/%.c FORCE $(call if_changed_dep,cc_lst_c) -# Compile assembler sources (.S) +# header test (header-test-y, header-test-m target) # --------------------------------------------------------------------------- -modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) +quiet_cmd_cc_s_h = CC $@ + cmd_cc_s_h = $(CC) $(c_flags) -S -o $@ -x c /dev/null -include $< -$(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) -$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) +$(obj)/%.h.s: $(src)/%.h FORCE + $(call if_changed_dep,cc_s_h) + +# Compile assembler sources (.S) +# --------------------------------------------------------------------------- # .S file exports must have their C prototypes defined in asm/asm-prototypes.h # or a file that it includes, in order to get versioned symbols. We build a @@ -343,11 +336,7 @@ $(obj)/%.s: $(src)/%.S FORCE quiet_cmd_as_o_S = AS $(quiet_modtag) $@ cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< -ifdef CONFIG_MODVERSIONS - -ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) - -ifneq ($(ASM_PROTOTYPES),) +ifdef CONFIG_ASM_MODVERSIONS # versioning matches the C process described above, with difference that # we parse asm-prototypes.h C header to get function definitions. @@ -363,7 +352,6 @@ cmd_modversions_S = \ rm -f $(@D)/.tmp_$(@F:.o=.ver); \ fi endif -endif $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE $(call if_changed_rule,as_o_S) @@ -382,9 +370,9 @@ $(obj)/%.lds: $(src)/%.lds.S FORCE # ASN.1 grammar # --------------------------------------------------------------------------- -quiet_cmd_asn1_compiler = ASN.1 $@ +quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ - $(subst .h,.c,$@) $(subst .c,.h,$@) + $(basename $@).c $(basename $@).h $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler $(call cmd,asn1_compiler) @@ -401,7 +389,7 @@ $(sort $(subdir-obj-y)): $(subdir-ym) ; ifdef builtin-target quiet_cmd_ar_builtin = AR $@ - cmd_ar_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(real-prereqs) + cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs) $(builtin-target): $(real-obj-y) FORCE $(call if_changed,ar_builtin) @@ -414,13 +402,10 @@ endif # builtin-target # # 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)) > $@ + $(Q){ $(foreach m, $(modorder), \ + $(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \ + | $(AWK) '!x[$$0]++' - > $@ # # Rule to compile a set of .o files into one .a file (with symbol table) @@ -455,12 +440,10 @@ endif # module is turned into a multi object module, $^ will contain header file # dependencies recorded in the .*.cmd file. quiet_cmd_link_multi-m = LD [M] $@ -cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis) + cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(multi-used-m): FORCE $(call if_changed,link_multi-m) - @{ echo $(@:.o=.ko); echo $(filter %.o,$^); \ - $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) $(call multi_depend, $(multi-used-m), .o, -objs -y -m) targets += $(multi-used-m) @@ -481,12 +464,52 @@ targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ $(call intermediate_targets, .lex.o, .lex.c) \ $(call intermediate_targets, .tab.o, .tab.c .tab.h) +# Build +# --------------------------------------------------------------------------- + +ifdef single-build + +curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \ + $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x)))) + +# Handle single targets without any rule: show "Nothing to be done for ..." or +# "No rule to make target ..." depending on whether the target exists. +unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \ + $(filter $(obj)/%, \ + $(filter-out $(curdir-single), \ + $(KBUILD_SINGLE_TARGETS)))) + +__build: $(curdir-single) $(subdir-ym) +ifneq ($(unknown-single),) + $(Q)$(MAKE) -f /dev/null $(unknown-single) +endif + @: + +ifeq ($(curdir-single),) +# Nothing to do in this directory. Do not include any .*.cmd file for speed-up +targets := +else +targets += $(curdir-single) +endif + +else + +__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ + $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \ + $(subdir-ym) $(always) + @: + +endif + # Descending # --------------------------------------------------------------------------- PHONY += $(subdir-ym) $(subdir-ym): - $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1) + $(Q)$(MAKE) $(build)=$@ \ + $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \ + need-builtin=$(if $(filter $@/built-in.a, $(subdir-obj-y)),1) \ + need-modorder=$(if $(need-modorder),$(if $(filter $@/modules.order, $(modorder)),1)) # Add FORCE to the prequisites of a target to force it to be always rebuilt. # --------------------------------------------------------------------------- @@ -504,7 +527,7 @@ existing-targets := $(wildcard $(sort $(targets))) -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) -ifneq ($(srctree),.) +ifdef building_out_of_srctree # Create directories for object files if they do not exist obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) # If targets exist, their directories apparently exist. Skip mkdir. |