LXR linux-old/Rules.make

   1#
   2# This file contains rules which are shared between multiple Makefiles.
   3#
   4
   5#
   6# False targets.
   7#
   8.PHONY: dummy
   9
  10#
  11# Special variables which should not be exported
  12#
  13unexport EXTRA_ASFLAGS
  14unexport EXTRA_CFLAGS
  15unexport EXTRA_LDFLAGS
  16unexport EXTRA_ARFLAGS
  17unexport SUBDIRS
  18unexport SUB_DIRS
  19unexport ALL_SUB_DIRS
  20unexport MOD_SUB_DIRS
  21unexport O_TARGET
  22unexport O_OBJS
  23unexport L_OBJS
  24unexport M_OBJS
  25# intermediate objects that form part of a module
  26unexport MI_OBJS
  27unexport ALL_MOBJS
  28# objects that export symbol tables
  29unexport OX_OBJS
  30unexport LX_OBJS
  31unexport MX_OBJS
  32unexport MIX_OBJS
  33unexport SYMTAB_OBJS
  34
  35unexport MOD_LIST_NAME
  36
  37#
  38# Get things started.
  39#
  40first_rule: sub_dirs
  41        $(MAKE) all_targets
  42
  43#
  44# Common rules
  45#
  46
  47%.s: %.c
  48        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -S $< -o $@
  49
  50%.i: %.c
  51        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -E $< > $@
  52
  53%.o: %.c
  54        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
  55
  56%.o: %.s
  57        $(AS) $(ASFLAGS) $(EXTRA_CFLAGS) -o $@ $<
  58
  59#
  60#
  61#
  62all_targets: $(O_TARGET) $(L_TARGET)
  63
  64#
  65# Rule to compile a set of .o files into one .o file
  66#
  67ifdef O_TARGET
  68ALL_O = $(OX_OBJS) $(O_OBJS)
  69$(O_TARGET): $(ALL_O) $(TOPDIR)/include/linux/config.h
  70        rm -f $@
  71ifneq "$(strip $(ALL_O))" ""
  72        $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(ALL_O)
  73else
  74        $(AR) rcs $@
  75endif
  76endif # O_TARGET
  77
  78#
  79# Rule to compile a set of .o files into one .a file
  80#
  81ifdef L_TARGET
  82$(L_TARGET): $(LX_OBJS) $(L_OBJS) $(TOPDIR)/include/linux/config.h
  83        rm -f $@
  84        $(AR) $(EXTRA_ARFLAGS) rcs $@ $(LX_OBJS) $(L_OBJS)
  85endif
  86
  87#
  88# This make dependencies quickly
  89#
  90fastdep: dummy
  91        $(TOPDIR)/scripts/mkdep *.[chS] > .depend
  92ifdef ALL_SUB_DIRS
  93        set -e; for i in $(ALL_SUB_DIRS); do $(MAKE) -C $$i fastdep; done
  94endif
  95
  96#
  97# A rule to make subdirectories
  98#
  99sub_dirs: dummy
 100ifdef SUB_DIRS
 101        set -e; for i in $(SUB_DIRS); do $(MAKE) -C $$i; done
 102endif
 103
 104#
 105# A rule to make modules
 106#
 107ALL_MOBJS = $(MX_OBJS) $(M_OBJS)
 108ifneq "$(strip $(ALL_MOBJS))" ""
 109PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 110endif
 111modules: $(ALL_MOBJS) $(MIX_OBJS) $(MI_OBJS) dummy
 112ifdef MOD_SUB_DIRS
 113        set -e; for i in $(MOD_SUB_DIRS); do $(MAKE) -C $$i modules; done
 114endif
 115ifdef MOD_IN_SUB_DIRS
 116        set -e; for i in $(MOD_IN_SUB_DIRS); do $(MAKE) -C $$i modules; done
 117endif
 118ifneq "$(strip $(MOD_LIST_NAME))" ""
 119        rm -f $$TOPDIR/modules/$(MOD_LIST_NAME)
 120ifdef MOD_SUB_DIRS
 121        for i in $(MOD_SUB_DIRS); do \
 122            echo `basename $$i`.o >> $$TOPDIR/modules/$(MOD_LIST_NAME); done
 123endif
 124ifneq "$(strip $(ALL_MOBJS))" ""
 125        echo $(ALL_MOBJS) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 126endif
 127ifneq "$(strip $(MOD_TO_LIST))" ""
 128        echo $(MOD_TO_LIST) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 129endif
 130endif
 131ifneq "$(strip $(ALL_MOBJS))" ""
 132        echo $(PDWN)
 133        cd $$TOPDIR/modules; for i in $(ALL_MOBJS); do \
 134            ln -sf ../$(PDWN)/$$i .; done
 135endif
 136
 137#
 138# A rule to do nothing
 139#
 140dummy:
 141
 142#
 143# This is useful for testing
 144#
 145script:
 146        $(SCRIPT)
 147
 148#
 149# This sets version suffixes on exported symbols
 150# Uses SYMTAB_OBJS
 151# Separate the object into "normal" objects and "exporting" objects
 152# Exporting objects are: all objects that define symbol tables
 153#
 154ifdef CONFIG_MODULES
 155
 156SYMTAB_OBJS = $(LX_OBJS) $(OX_OBJS) $(MX_OBJS) $(MIX_OBJS)
 157
 158ifdef CONFIG_MODVERSIONS
 159ifneq "$(strip $(SYMTAB_OBJS))" ""
 160
 161MODINCL = $(TOPDIR)/include/linux/modules
 162
 163# The -w option (enable warnings) for genksyms will return here in 2.1
 164$(MODINCL)/%.ver: %.c
 165        $(CC) $(CFLAGS) -E -D__GENKSYMS__ $<\
 166        | $(GENKSYMS) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp
 167        mv $@.tmp $@
 168        
 169$(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 170
 171$(TOPDIR)/include/linux/modversions.h: $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver))
 172        @echo updating $(TOPDIR)/include/linux/modversions.h
 173        @(echo "#ifndef _LINUX_MODVERSIONS_H";\
 174          echo "#define _LINUX_MODVERSIONS_H"; \
 175          echo "#include <linux/modsetver.h>"; \
 176          cd $(TOPDIR)/include/linux/modules; \
 177          for f in *.ver; do \
 178            if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 179          done; \
 180          echo "#endif"; \
 181        ) > $@
 182
 183dep fastdep: $(TOPDIR)/include/linux/modversions.h
 184
 185endif # SYMTAB_OBJS 
 186
 187$(M_OBJS): $(TOPDIR)/include/linux/modversions.h
 188ifdef MAKING_MODULES
 189$(O_OBJS) $(L_OBJS): $(TOPDIR)/include/linux/modversions.h
 190endif
 191
 192else
 193
 194$(TOPDIR)/include/linux/modversions.h:
 195        @echo "#include <linux/modsetver.h>" > $@
 196
 197endif # CONFIG_MODVERSIONS
 198
 199ifneq "$(strip $(SYMTAB_OBJS))" ""
 200$(SYMTAB_OBJS): $(TOPDIR)/include/linux/modversions.h $(SYMTAB_OBJS:.o=.c)
 201        $(CC) $(CFLAGS) -DEXPORT_SYMTAB -c $(@:.o=.c)
 202endif
 203
 204endif # CONFIG_MODULES
 205
 206
 207#
 208# include dependency files they exist
 209#
 210ifeq (.depend,$(wildcard .depend))
 211include .depend
 212endif
 213
 214ifeq ($(TOPDIR)/.hdepend,$(wildcard $(TOPDIR)/.hdepend))
 215include $(TOPDIR)/.hdepend
 216endif
 217