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 #
  13 unexport EXTRA_ASFLAGS
  14 unexport EXTRA_CFLAGS
  15 unexport EXTRA_LDFLAGS
  16 unexport EXTRA_ARFLAGS
  17 unexport SUBDIRS
  18 unexport SUB_DIRS
  19 unexport ALL_SUB_DIRS
  20 unexport MOD_SUB_DIRS
  21 unexport O_TARGET
  22 unexport O_OBJS
  23 unexport L_OBJS
  24 unexport M_OBJS
  25 unexport ALL_MOBJS
  26 # objects that export symbol tables
  27 unexport OX_OBJS
  28 unexport LX_OBJS
  29 unexport MX_OBJS
  30 unexport SYMTAB_OBJS
  31
  32 unexport MOD_LIST_NAME
  33
  34 #
  35 # Get things started.
  36 #
  37 first_rule: sub_dirs
  38         $(MAKE) all_targets
  39
  40 #
  41 # Common rules
  42 #
  43
  44 %.s: %.c
  45         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -S $< -o $@
  46
  47 %.o: %.c
  48         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
  49
  50 %.o: %.s
  51         $(AS) $(ASFLAGS) $(EXTRA_CFLAGS) -o $@ $<
  52
  53 #
  54 #
  55 #
  56 all_targets: $(O_TARGET) $(L_TARGET)
  57
  58 #
  59 # Rule to compile a set of .o files into one .o file
  60 #
  61 ifdef O_TARGET
  62 ALL_O = $(OX_OBJS) $(O_OBJS)
  63 $(O_TARGET): $(ALL_O) $(TOPDIR)/include/linux/config.h
  64         rm -f $@
  65 ifneq "$(strip $(ALL_O))" ""
  66         $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(ALL_O)
  67 else
  68         $(AR) rcs $@
  69 endif
  70 endif # O_TARGET
  71
  72 #
  73 # Rule to compile a set of .o files into one .a file
  74 #
  75 ifdef L_TARGET
  76 $(L_TARGET): $(LX_OBJS) $(L_OBJS) $(TOPDIR)/include/linux/config.h
  77         rm -f $@
  78         $(AR) $(EXTRA_ARFLAGS) rcs $@ $(LX_OBJS) $(L_OBJS)
  79 endif
  80
  81 #
  82 # This make dependencies quickly
  83 #
  84 fastdep: dummy
  85         if [ -n "$(wildcard *.[chS])" ]; then \
  86         $(TOPDIR)/scripts/mkdep *.[chS] > .depend; fi
  87 ifdef ALL_SUB_DIRS
  88         set -e; for i in $(ALL_SUB_DIRS); do $(MAKE) -C $$i fastdep; done
  89 endif
  90
  91 #
  92 # A rule to make subdirectories
  93 #
  94 sub_dirs: dummy
  95 ifdef SUB_DIRS
  96         set -e; for i in $(SUB_DIRS); do $(MAKE) -C $$i; done
  97 endif
  98
  99 #
 100 # A rule to make modules
 101 #
 102 ALL_MOBJS = $(MX_OBJS) $(M_OBJS)
 103 ifneq "$(strip $(ALL_MOBJS))" ""
 104 PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 105 endif
 106 modules: $(ALL_MOBJS) dummy
 107 ifdef MOD_SUB_DIRS
 108         set -e; for i in $(MOD_SUB_DIRS); do $(MAKE) -C $$i modules; done
 109 endif
 110 ifdef MOD_IN_SUB_DIRS
 111         set -e; for i in $(MOD_IN_SUB_DIRS); do $(MAKE) -C $$i modules; done
 112 endif
 113 ifneq "$(strip $(MOD_LIST_NAME))" ""
 114         rm -f $$TOPDIR/modules/$(MOD_LIST_NAME)
 115 ifdef MOD_SUB_DIRS
 116         for i in $(MOD_SUB_DIRS); do \
 117             echo `basename $$i`.o >> $$TOPDIR/modules/$(MOD_LIST_NAME); done
 118 endif
 119 ifneq "$(strip $(ALL_MOBJS))" ""
 120         echo $(ALL_MOBJS) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 121 endif
 122 ifneq "$(strip $(MOD_TO_LIST))" ""
 123         echo $(MOD_TO_LIST) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 124 endif
 125 endif
 126 ifneq "$(strip $(ALL_MOBJS))" ""
 127         echo $(PDWN)
 128         cd $$TOPDIR/modules; for i in $(ALL_MOBJS); do \
 129             ln -sf ../$(PDWN)/$$i .; done
 130 endif
 131
 132 #
 133 # A rule to do nothing
 134 #
 135 dummy:
 136
 137 #
 138 # This is useful for testing
 139 #
 140 script:
 141         $(SCRIPT)
 142
 143 #
 144 # This sets version suffixes on exported symbols
 145 # Uses SYMTAB_OBJS
 146 # Separate the object into "normal" objects and "exporting" objects
 147 # Exporting objects are: all objects that define symbol tables
 148 #
 149 ifdef CONFIG_MODULES
 150
 151 SYMTAB_OBJS = $(LX_OBJS) $(OX_OBJS) $(MX_OBJS)
 152
 153 ifdef CONFIG_MODVERSIONS
 154 ifneq "$(strip $(SYMTAB_OBJS))" ""
 155
 156 MODINCL = $(TOPDIR)/include/linux/modules
 157
 158 # The -w option (enable warnings) for genksyms will return here in 2.1
 159 $(MODINCL)/%.ver: %.c
 160         $(CC) $(CFLAGS) -E -D__GENKSYMS__ $<\
 161         | $(GENKSYMS) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp
 162         mv $@.tmp $@
 163
 164 $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 165
 166 $(TOPDIR)/include/linux/modversions.h: $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver))
 167         @echo updating $(TOPDIR)/include/linux/modversions.h
 168         @(echo "#ifndef _LINUX_MODVERSIONS_H";\
 169           echo "#define _LINUX_MODVERSIONS_H"; \
 170           echo "#include <linux/modsetver.h>"; \
 171           cd $(TOPDIR)/include/linux/modules; \
 172           for f in *.ver; do \
 173             if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 174           done; \
 175           echo "#endif"; \
 176         ) > $@
 177
 178 dep fastdep: $(TOPDIR)/include/linux/modversions.h
 179
 180 endif # SYMTAB_OBJS
 181
 182 $(M_OBJS): $(TOPDIR)/include/linux/modversions.h
 183 ifdef MAKING_MODULES
 184 $(O_OBJS) $(L_OBJS): $(TOPDIR)/include/linux/modversions.h
 185 endif
 186
 187 else
 188
 189 $(TOPDIR)/include/linux/modversions.h:
 190         @echo "#include <linux/modsetver.h>" > $@
 191
 192 endif # CONFIG_MODVERSIONS
 193
 194 ifneq "$(strip $(SYMTAB_OBJS))" ""
 195 $(SYMTAB_OBJS): $(TOPDIR)/include/linux/modversions.h
 196         $(CC) $(CFLAGS) -DEXPORT_SYMTAB -c $(@:.o=.c)
 197 endif
 198
 199 endif # CONFIG_MODULES
 200
 201
 202 #
 203 # include dependency files they exist
 204 #
 205 ifeq (.depend,$(wildcard .depend))
 206 include .depend
 207 endif
 208
 209 ifeq ($(TOPDIR)/.hdepend,$(wildcard $(TOPDIR)/.hdepend))
 210 include $(TOPDIR)/.hdepend
 211 endif