C++ 将-m32参数添加到Makefile命令

我有一个简单的问题

这是我的Makefile

#############################################################################
#
#   Makefile for building the Long Range Navigator program
#
#############################################################################

PC = true
#PC = false

PWD       := $(shell pwd)

#GUMSTIX_BUILDROOT   = /home/irmabot/gumstix-buildroot
#BUILD_ARM      = $(GUMSTIX_BUILDROOT)/build_arm_nofpu
#CROSS_COMPILE      = $(BUILD_ARM)/staging_dir/bin/arm-linux-
#BUILD_ARM           = $(wildcard $(GUMSTIX_BUILDROOT)/build_arm*)
#CROSS_COMPILE       = $(patsubst %g++, %, $(wildcard $(BUILD_ARM)/staging_dir/bin/arm-linux-uclibc*-g++))
#CROSS_COMPILE = /home/irmabot/gumstix/gumstix-oe/tmp/cross/arm-angstrom-linux-gnueabi/bin/
CROSS_COMPILE = /home/babbage/marbotRelease/src/processors/longRangeNavigator/arm/arm-angstrom-linux-gnueabi/bin/
COMMON          = ../../common
SHARED          = Shared
I32 = /usr/include/x86_64-linux-gnu/c++/4.7/bits/


#ifeq ($(strip $(CROSS_COMPILE)),)
#   $(error Unable to detect C++ Cross Compiler)
#endif

vpath %.c  %.cpp $(COMMON) $(SHARED)

CPPFLAGS +=  -I . -I $(COMMON) -I $(SHARED) -I$(I32)
CFLAGS   += -Wall -I$(I32)

ifeq ($(PC), true)
CPPFLAGS += -DPC -m32 
CFLAGS   += -DPC -m32    
CC = g++
CXX = g++

OBJS = longRangeNavigator.o GALRN.o InternalMap.o MandamiFuzzyModel.o     MembershipFunctions_1D.o Utils.o ../../common/configFile/configFile.o 

else                # else
TARGET_ARCH=-Os -march=armv5te -mtune=xscale -Wa,-mcpu=xscale
CC = $(CROSS_COMPILE)g++
CXX = $(CROSS_COMPILE)g++

OBJS = \
   longRangeNavigator.o         \
    GALRN.o                         \
    InternalMap.o                   \
    MandamiFuzzyModel.o         \
    MembershipFunctions_1D.o    \
    Utils.o                         \
    ../../common/configFile/configFile.o


endif               # endif 

all: longRangeNavigator

longRangeNavigator: $(OBJS)

clean:
    rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions longRangeNavigator

depend .depend dep:
    @echo "Creating dependencies ..."
    $(CXX) $(CFLAGS) $(CPPFLAGS) -M  *.cpp  > .depend

FORCE:

.PHONY: FORCE

PREPROCESS.c = $(CXX) $(CPPFLAGS) $(TARGET_ARCH) -E -Wp,-C,-dD,-dI

%.pp : %.c  FORCE
    $(PREPROCESS.c) $< > $@

ifeq ($(strip $(filter clean, $(MAKECMDGOALS))),)
-include .depend
endif

所以，问题显然就在这里。其中，我将32位代码与64位链接器链接

g++   longRangeNavigator.o GALRN.o InternalMap.o MandamiFuzzyModel.o MembershipFunctions_1D.o Utils.o ../../common/configFile/configFile.o   -o longRangeNavigator

我不完全理解Makefile niether，在这里这个动作是异常的。

---

我只想添加-m32参数。

如果您有yum或apt，您可以安装gcc32并使用它。请同时在或64或32中使用。

您还需要将

-m32

传递给链接器。一种方法是将此行添加到Makefile：

LDFLAGS += -m32

---

LDFLAGS是一个内置变量，每当链接器被

LDFLAGS

调用时，其值就会添加到链接器命令中。但是设置CXX=g++-m32更容易些。我知道这一点。我只是不知道隐含的规则。非常感谢！！

LDFLAGS += -m32