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
  25unexport ALL_MOBJS
  26# objects that export symbol tables
  27unexport OX_OBJS
  28unexport LX_OBJS
  29unexport MX_OBJS
  30unexport SYMTAB_OBJS
  31
  32unexport MOD_LIST_NAME
  33
  34#
  35# Get things started.
  36#
  37first_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#
  56all_targets: $(O_TARGET) $(L_TARGET)
  57
  58#
  59# Rule to compile a set of .o files into one .o file
  60#
  61ifdef O_TARGET
  62ALL_O = $(OX_OBJS) $(O_OBJS)
  63$(O_TARGET): $(ALL_O) $(TOPDIR)/include/linux/config.h
  64        rm -f $@
  65ifneq "$(strip $(ALL_O))" ""
  66        $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(ALL_O)
  67else
  68        $(AR) rcs $@
  69endif
  70endif
  71
  72#
  73# Rule to compile a set of .o files into one .a file
  74#
  75ifdef L_TARGET
  76$(L_TARGET): $(LX_OBJS) $(L_OBJS) $(TOPDIR)/include/linux/config.h
  77        rm -f $@
  78        $(AR) $(EXTRA_ARFLAGS) rcs $@ $(LX_OBJS) $(L_OBJS)
  79endif
  80
  81#
  82# This make dependencies quickly
  83#
  84fastdep: dummy
  85        if [ -n "$(wildcard *.[chS])" ]; then \
  86        $(TOPDIR)/scripts/mkdep *.[chS] > .depend; fi
  87ifdef ALL_SUB_DIRS
  88        set -e; for i in $(ALL_SUB_DIRS); do $(MAKE) -C $$i fastdep; done
  89endif
  90
  91#
  92# A rule to make subdirectories
  93#
  94sub_dirs: dummy
  95ifdef SUB_DIRS
  96        set -e; for i in $(SUB_DIRS); do $(MAKE) -C $$i; done
  97endif
  98
  99#
 100# A rule to make modules
 101#
 102ALL_MOBJS = $(MX_OBJS) $(M_OBJS)
 103ifneq "$(strip $(ALL_MOBJS))" ""
 104PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 105endif
 106modules: $(ALL_MOBJS) dummy
 107ifdef MOD_SUB_DIRS
 108        set -e; for i in $(MOD_SUB_DIRS); do $(MAKE) -C $$i modules; done
 109endif
 110ifneq "$(strip $(MOD_LIST_NAME))" ""
 111        rm -f $$TOPDIR/modules/$(MOD_LIST_NAME)
 112ifdef MOD_SUB_DIRS
 113        for i in $(MOD_SUB_DIRS); do \
 114            echo `basename $$i`.o >> $$TOPDIR/modules/$(MOD_LIST_NAME); done
 115endif
 116ifneq "$(strip $(ALL_MOBJS))" ""
 117        echo $(ALL_MOBJS) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 118endif
 119endif
 120ifneq "$(strip $(ALL_MOBJS))" ""
 121        echo $(PDWN)
 122        cd $$TOPDIR/modules; for i in $(ALL_MOBJS); do \
 123            ln -sf ../$(PDWN)/$$i .; done
 124endif
 125
 126#
 127# A rule to do nothing
 128#
 129dummy:
 130
 131#
 132# This is useful for testing
 133#
 134script:
 135        $(SCRIPT)
 136
 137#
 138# This sets version suffixes on exported symbols
 139# Uses SYMTAB_OBJS
 140# Separate the object into "normal" objects and "exporting" objects
 141# Exporting objects are: all objects that define symbol tables
 142#
 143ifdef CONFIG_MODVERSIONS
 144SYMTAB_OBJS = $(LX_OBJS) $(OX_OBJS) $(MX_OBJS)
 145ifneq "$(strip $(SYMTAB_OBJS))" ""
 146
 147MODINCL = $(TOPDIR)/include/linux/modules
 148
 149# The -w option (enable warnings) for /bin/genksyms will return here in 2.1
 150$(MODINCL)/%.ver: %.c
 151        @if [ ! -x /sbin/genksyms ]; then echo "Please read: Documentation/modules.txt"; fi
 152        $(CC) $(CFLAGS) -E -D__GENKSYMS__ $< | /sbin/genksyms $(MODINCL)
 153
 154$(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 155
 156$(TOPDIR)/include/linux/modversions.h: $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver))
 157        @echo updating $(TOPDIR)/include/linux/modversions.h
 158        @(echo "#ifdef MODVERSIONS";\
 159        echo "#undef  CONFIG_MODVERSIONS";\
 160        echo "#define CONFIG_MODVERSIONS";\
 161        echo "#ifndef _set_ver";\
 162        echo "#define _set_ver(sym,vers) sym ## _R ## vers";\
 163        echo "#endif";\
 164        cd $(TOPDIR)/include/linux/modules; for f in *.ver;\
 165        do echo "#include <linux/modules/$${f}>"; done; \
 166        echo "#undef  CONFIG_MODVERSIONS";\
 167        echo "#endif") \
 168        > $(TOPDIR)/include/linux/modversions.h
 169
 170$(MX_OBJS): $(TOPDIR)/include/linux/modversions.h
 171        $(CC) $(CFLAGS) -DEXPORT_SYMTAB -c $(@:.o=.c)
 172
 173$(LX_OBJS) $(OX_OBJS): $(TOPDIR)/include/linux/modversions.h
 174        $(CC) $(CFLAGS) -DMODVERSIONS -DEXPORT_SYMTAB -c $(@:.o=.c)
 175
 176dep fastdep: $(TOPDIR)/include/linux/modversions.h
 177
 178endif
 179$(M_OBJS): $(TOPDIR)/include/linux/modversions.h
 180ifdef MAKING_MODULES
 181$(O_OBJS) $(L_OBJS): $(TOPDIR)/include/linux/modversions.h
 182endif
 183# This is needed to ensure proper dependency for multipart modules such as
 184# fs/ext.o.  (Otherwise, not all subobjects will be recompiled when
 185# version information changes.)
 186
 187endif
 188
 189#
 190# include dependency files they exist
 191#
 192ifeq (.depend,$(wildcard .depend))
 193include .depend
 194endif
 195
 196ifeq ($(TOPDIR)/.hdepend,$(wildcard $(TOPDIR)/.hdepend))
 197include $(TOPDIR)/.hdepend
 198endif
 199