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 # intermediate objects that form part of a module
  26 unexport MI_OBJS
  27 unexport ALL_MOBJS
  28 # objects that export symbol tables
  29 unexport OX_OBJS
  30 unexport LX_OBJS
  31 unexport MX_OBJS
  32 unexport MIX_OBJS
  33 unexport SYMTAB_OBJS
  34
  35 unexport MOD_LIST_NAME
  36
  37 #
  38 # Get things started.
  39 #
  40 first_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 #
  62 all_targets: $(O_TARGET) $(L_TARGET)
  63
  64 #
  65 # Rule to compile a set of .o files into one .o file
  66 #
  67 ifdef O_TARGET
  68 ALL_O = $(OX_OBJS) $(O_OBJS)
  69 $(O_TARGET): $(ALL_O) $(TOPDIR)/include/linux/config.h
  70         rm -f $@
  71 ifneq "$(strip $(ALL_O))" ""
  72         $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(ALL_O)
  73 else
  74         $(AR) rcs $@
  75 endif
  76 endif # O_TARGET
  77
  78 #
  79 # Rule to compile a set of .o files into one .a file
  80 #
  81 ifdef 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)
  85 endif
  86
  87 #
  88 # This make dependencies quickly
  89 #
  90 fastdep: dummy
  91         $(TOPDIR)/scripts/mkdep *.[chS] > .depend
  92 ifdef ALL_SUB_DIRS
  93         set -e; for i in $(ALL_SUB_DIRS); do $(MAKE) -C $$i fastdep; done
  94 endif
  95
  96 #
  97 # A rule to make subdirectories
  98 #
  99 sub_dirs: dummy
 100 ifdef SUB_DIRS
 101         set -e; for i in $(SUB_DIRS); do $(MAKE) -C $$i; done
 102 endif
 103
 104 #
 105 # A rule to make modules
 106 #
 107 ALL_MOBJS = $(MX_OBJS) $(M_OBJS)
 108 ifneq "$(strip $(ALL_MOBJS))" ""
 109 PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 110 endif
 111 modules: $(ALL_MOBJS) $(MIX_OBJS) $(MI_OBJS) dummy
 112 ifdef MOD_SUB_DIRS
 113         set -e; for i in $(MOD_SUB_DIRS); do $(MAKE) -C $$i modules; done
 114 endif
 115 ifdef MOD_IN_SUB_DIRS
 116         set -e; for i in $(MOD_IN_SUB_DIRS); do $(MAKE) -C $$i modules; done
 117 endif
 118 ifneq "$(strip $(MOD_LIST_NAME))" ""
 119         rm -f $$TOPDIR/modules/$(MOD_LIST_NAME)
 120 ifdef MOD_SUB_DIRS
 121         for i in $(MOD_SUB_DIRS); do \
 122             echo `basename $$i`.o >> $$TOPDIR/modules/$(MOD_LIST_NAME); done
 123 endif
 124 ifneq "$(strip $(ALL_MOBJS))" ""
 125         echo $(ALL_MOBJS) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 126 endif
 127 ifneq "$(strip $(MOD_TO_LIST))" ""
 128         echo $(MOD_TO_LIST) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 129 endif
 130 endif
 131 ifneq "$(strip $(ALL_MOBJS))" ""
 132         echo $(PDWN)
 133         cd $$TOPDIR/modules; for i in $(ALL_MOBJS); do \
 134             ln -sf ../$(PDWN)/$$i .; done
 135 endif
 136
 137 #
 138 # A rule to do nothing
 139 #
 140 dummy:
 141
 142 #
 143 # This is useful for testing
 144 #
 145 script:
 146         $(SCRIPT)
 147
 148 #
 149 # This sets version suffixes on exported symbols
 150 # Uses SYMTAB_OBJS
 151 # Separate the object into "normal" objects and "exporting" objects
 152 # Exporting objects are: all objects that define symbol tables
 153 #
 154 ifdef CONFIG_MODULES
 155
 156 SYMTAB_OBJS = $(LX_OBJS) $(OX_OBJS) $(MX_OBJS) $(MIX_OBJS)
 157
 158 ifdef CONFIG_MODVERSIONS
 159 ifneq "$(strip $(SYMTAB_OBJS))" ""
 160
 161 MODINCL = $(TOPDIR)/include/linux/modules
 162
 163 # The -w option (enable warnings) for genksyms will return here in 2.1
 164 $(MODINCL)/%.ver: %.c
 165         $(CC) $(CFLAGS) -E -D__GENKSYMS__ $<\
 166         | $(GENKSYMS) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp
 167         mv $@.tmp $@
 168
 169 $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 170
 171 $(TOPDIR)/include/linux/modversions.h: $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver))
 172         @echo updating $(TOPDIR)/include/linux/modversions.h
 173         @(echo "#ifndef _LINUX_MODVERSIONS_H";\
 174           echo "#define _LINUX_MODVERSIONS_H"; \
 175           echo "#include <linux/modsetver.h>"; \
 176           cd $(TOPDIR)/include/linux/modules; \
 177           for f in *.ver; do \
 178             if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 179           done; \
 180           echo "#endif"; \
 181         ) > $@
 182
 183 dep fastdep: $(TOPDIR)/include/linux/modversions.h
 184
 185 endif # SYMTAB_OBJS
 186
 187 $(M_OBJS): $(TOPDIR)/include/linux/modversions.h
 188 ifdef MAKING_MODULES
 189 $(O_OBJS) $(L_OBJS): $(TOPDIR)/include/linux/modversions.h
 190 endif
 191
 192 else
 193
 194 $(TOPDIR)/include/linux/modversions.h:
 195         @echo "#include <linux/modsetver.h>" > $@
 196
 197 endif # CONFIG_MODVERSIONS
 198
 199 ifneq "$(strip $(SYMTAB_OBJS))" ""
 200 $(SYMTAB_OBJS): $(TOPDIR)/include/linux/modversions.h $(SYMTAB_OBJS:.o=.c)
 201         $(CC) $(CFLAGS) -DEXPORT_SYMTAB -c $(@:.o=.c)
 202 endif
 203
 204 endif # CONFIG_MODULES
 205
 206
 207 #
 208 # include dependency files they exist
 209 #
 210 ifeq (.depend,$(wildcard .depend))
 211 include .depend
 212 endif
 213
 214 ifeq ($(TOPDIR)/.hdepend,$(wildcard $(TOPDIR)/.hdepend))
 215 include $(TOPDIR)/.hdepend
 216 endif