makefile

vxworks源码源码解读是学习vxworks的最佳途径

# Makefile - makefile for target/src/fs/libgcc
#
# modification history
# --------------------
# 01a,23mar99,yp  derived from 01o target/src/cplus/libgcc/Makefile
# 
# DESCRIPTION
# This file contains the makefile rules for grabbing what we
# need from "libgcc.a" 
#*/

# TODO: Make DOS Happy, lrn: added some objs, may need others.

TGT_DIR=$(WIND_BASE)/target

LIBNAME=lib$(CPU)$(TOOL)vx.a
LIBDIRNAME=obj$(CPU)$(TOOL)vx

OBJS_INT64 =\
_ashldi3.o \
_ashrdi3.o \
_divdi3.o \
_muldi3.o \
_moddi3.o \
_cmpdi2.o

ifneq ($(CPU),SIMNT)
    OBJS=$(OBJS_BASIC) $(OBJS_INT64)
else
    OBJS=$(OBJS_BASIC) $(OBJS_INT64) \
frame.o
endif

include $(TGT_DIR)/h/make/rules.library

# The choice of which libgcc.a to use depends on CANONICAL_TARGET
# (defined below) and the compile flags used.
# Eventually the derivation of CANONICAL_TARGET should be moved
# to make.$CPU$TOOL where the definition is fixed by the context, 
# but for now we do it here.

# The basic idea is to generate a subdirectory based on a subset
# of the compile flags (listed in MULTILIB_FILTER, defined below)
# In most cases the subdirectory and its corresponding flag have the 
# same name. There are a few  exceptions in the case of msoft-float 
# which is why we define MULTILIB_SFDIR. There are also
# a class of flags whose corresponding subdirectory does
# not contain the leading "m". These are dealt with one
# by one after the comment "# Some flags need to have the leading "m" removed".
# These flags should be listed without the leading "m" in MULTILIB_FILTER.
# For some CPUs msoft-float is implied. We use MULTILIB_SFMATCHES
# to catch these.

# The source for MULTILIB information is
# $WIND_BASE/host/src/gnu/$WIND_HOST_TYPE/$CANONICAL_TARGET/gcc/Makefile
# (generated when you build the compiler)

MULTILIB_SFDIR=msoft-float
MULTILIB_SFMATCHES=

CYGNUS_VER=cygnus-2.7.2-960126

ifeq ($(strip $(VX_CPU_FAMILY)),386)
    CANONICAL_TARGET=i386-wrs-vxworks
    MULTILIB_FILTER=
endif

ifeq ($(strip $(VX_CPU_FAMILY)),960)
    CANONICAL_TARGET=i960-wrs-vxworks5.3
    MULTILIB_FILTER=msoft-float
    MULTILIB_SFDIR=float
    MULTILIB_SFMATCHES=mkb
endif

ifeq ($(strip $(VX_CPU_FAMILY)),68k)
    CANONICAL_TARGET=m68k-wrs-vxworks
    MULTILIB_FILTER=m68000 msoft-float
endif

ifeq ($(strip $(VX_CPU_FAMILY)),mips)
    CANONICAL_TARGET=mips-wrs-vxworks
    MULTILIB_FILTER=mips3 msingle-float msoft-float
endif

ifeq ($(strip $(VX_CPU_FAMILY)),PPC)
    CANONICAL_TARGET=powerpc-wrs-vxworks
    MULTILIB_FILTER=msoft-float  
    MULTILIB_SFDIR=soft-float
    MULTILIB_SFMATCHES=mcpu=860 mcpu=403
endif

ifeq ($(strip $(VX_CPU_FAMILY)),simso)
    CANONICAL_TARGET=sparc-sun-solaris2.5.1
    MULTILIB_FILTER=
endif

ifeq ($(strip $(VX_CPU_FAMILY)),sparc)
    CANONICAL_TARGET=sparc-wrs-vxworks
    MULTILIB_FILTER=msoft-float mv8
    MULTILIB_SFDIR=soft
endif

ifeq ($(strip $(VX_CPU_FAMILY)),arm)
    CYGNUS_VER=2.7.9-970819
    CANONICAL_TARGET=arm-wrs-vxworks
    MULTILIB_FILTER=thumb
endif	

ifeq ($(strip $(subst simhppa,hppa,$(VX_CPU_FAMILY))),hppa)
    CANONICAL_TARGET=hppa1.1-wrs-vxworks
    MULTILIB_FILTER=
endif

ifeq ($(strip $(VX_CPU_FAMILY)),SIMNT)
    CYGNUS_VER=egcs-2.90.29
    CANONICAL_TARGET=i386-pc-mingw32
    MULTILIB_FILTER=
endif

# Strip of leading -'s from CFLAGS
MULTIFLAGS1=$(patsubst -%,%,$(CFLAGS))

# Some flags go by more than one name
MULTIFLAGS2=$(MULTIFLAGS1:mc68000=m68000)

# Some flags need to have the leading "m" removed.
# The last iteration should result in a variable named MULTIFLAGS
MULTIFLAGS3=$(subst mthumb, thumb, $(MULTIFLAGS2))
MULTIFLAGS=$(subst mv8, v8, $(MULTIFLAGS3))

# Only select the options listed in MULTILIB_FILTER
MULTILIB_DIR1=$(strip $(filter $(MULTILIB_FILTER),$(MULTIFLAGS)))

# Does another flag imply msoft-float?
ifeq ($(filter $(MULTILIB_SFMATCHES),$(MULTIFLAGS)),)
    MULTILIB_EXTRA=
else
    MULTILIB_EXTRA=$(MULTILIB_SFDIR)
endif

# Replace msoft-float by the corresponding directory name
MULTILIB_DIR2=$(subst msoft-float,$(MULTILIB_SFDIR),$(MULTILIB_DIR1))

# See GNU Toolkit 2.7/8.1 for an explanation of this roundabout
# way of doing things ...
empty=
space=$(empty) $(empty)

# Mash the remaining flags into a directory name. Notice that
# we rely on a particular ordering of the flags in CFLAGS for this
# to work.
MULTILIB_DIR=$(subst $(space),/,$(strip $(MULTILIB_DIR2)$(space)$(MULTILIB_EXTRA)))

# If there are no flags left we end up with a single /
ifeq ($(MULTILIB_DIR),/)
    MULTILIB_DIR=
endif
 

LIBGCC= $(WIND_BASE)/host/$(WIND_HOST_TYPE)/lib/gcc-lib/$(CANONICAL_TARGET)/$(CYGNUS_VER)/$(MULTILIB_DIR)/libgcc.a

# iostreams long double support requires pulling in some extra floating
# point libraries in some cases: long term this should probably be
# done elsewhere ...

EXTRA_OBJS=

ifeq ($(strip $(VX_CPU_FAMILY)),68k)
    EXTRA_OBJS=xfgnulib.o
endif

# rules.library only looks in the current directory for
# source files when it determines the objects we can build.
# In our case the objects have already been built in the
# GNU build tree (in libgcc.a) and we just want to pull them out.
 
LIBOBJS         = $(foreach file, $(OBJS) $(EXTRA_OBJS), $(LIBDIR)/$(file))

# On windows there needs to be a target called $(file)_clean for each file
# in $(LIBOBJS).
ifeq ($(WIND_HOST_TYPE),x86-win32)
clean: $(foreach file,$(subst /,$(DIRCHAR),$(LIBOBJS) $(LOCAL_CLEAN)),$(file)_clean)
$(foreach file,$(subst /,$(DIRCHAR),$(LIBOBJS) $(LOCAL_CLEAN)),$(file)_clean):
	$(RM) $(subst _clean,,$@)
endif

# Repeat the work of rules.library with the correct object list

objs : $(LIBOBJS) Makefile
$(subst /,$(DIRCHAR),$(TGT_DIR)/lib/$(LIBNAME)) : $(LIBOBJS)

ifeq ($(WIND_HOST_TYPE),x86-win32)
    SEMI=;
else
    SEMI=";"
endif

WRAPPER=$(LIBDIR)/_tmp_wrapper.c
TMP_OBJ=$(LIBDIR)/_tmp_obj.o

$(LIBOBJS) : $(LIBGCC) Makefile
	@echo Wrapping $@ ...
# This just adds a symbol __object_o to object.o. We chose
# to use a one-line C fragment rather than using the linker
# to directly add a symbol because this way we don't have
# to worry about whether or not the compiler prepends an underscore.
	echo char __$(notdir $*)_o = 0$(SEMI) > $(WRAPPER)
ifeq ($(WIND_HOST_TYPE),x86-win32)
	(cd $(LIBDIR) & $(AR) -x $(LIBGCC) $(notdir $@))
else
	(cd $(LIBDIR) ; $(AR) -x $(LIBGCC) $(notdir $@))
endif
	$(CC) -c $(CFLAGS) $(WRAPPER) -o $(TMP_OBJ)
	$(LD) $(LD_PARTIAL_FLAGS) -r $(TMP_OBJ) $@ -o $@_tmp
	$(CP) $(subst /,$(DIRCHAR),$@_tmp) $(subst /,$(DIRCHAR),$@)
	$(RM) $(WRAPPER) $(TMP_OBJ) $@_tmp