Question

我正在尝试使用gsl库进行一些随机数生成。我有以下makefile

CC = g++
#CFLAGS = -Wall -O2
CFLAGS = -g -Wall 
LDFLAGS = -Lgsl/lib -lgsl -lgslcblas -lm
INCLDIRS = -Igsl/include

RAND_TARGET = rand
HM_TARGET = hitormiss
NU_TARGET = nonuniform
MC1D_TARGET = mc1d

RAND_SRCS = rand.cc generators.cc EX_RNGs.cc LC_RNGs.cc util.cc RNG_factory.cc
HM_SRCS = hitormiss.cc generators.cc EX_RNGs.cc LC_RNGs.cc discrep.cc util.cc sphere.cc
NU_SRCS = nonuniform.cc generators.cc LC_RNGs.cc EX_RNGs.cc util.cc
MC1D_SRCS = mc1d.cc generators.cc LC_RNGs.cc

RAND_OBJS = ${RAND_SRCS:.cc=.o}
HM_OBJS = ${HM_SRCS:.cc=.o}
NU_OBJS = ${NU_SRCS:.cc=.o}
MC1D_OBJS = ${MC1D_SRCS:.cc=.o}

CLEANFILES =    $(RAND_OBJS) $(RAND_TARGET) \
        $(HM_OBJS) $(HM_TARGET) \
        $(NU_OBJS) $(NU_TARGET) \
        $(MC1D_OBJS) $(MC1D_TARGET) \
        core

VERYCLEANFILES = randdata.txt \
            randdata.bin \
            randdata2d.txt \
            accepts.txt \
            rejects.txt \
            nonuniformdata.txt \
            ${wildcard hom_*_*d_*.txt} \
            ${wildcard points_*_*d_*.txt}

all: $(RAND_TARGET) $(HM_TARGET) $(NU_TARGET) $(MC1D_TARGET)

release:
    (make CFLAGS="-Wall -O2" all;)

$(RAND_TARGET): $(RAND_OBJS)
    $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(INCLDIRS)

$(HM_TARGET): $(HM_OBJS)
    $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(INCLDIRS)

$(NU_TARGET): $(NU_OBJS)
    $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(INCLDIRS)

$(MC1D_TARGET): $(MC1D_OBJS)
    $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(INCLDIRS)

%.o: %.cc
    $(CC) $(CFLAGS) $(INCLDIRS) -c $<

clean:
    rm -f $(CLEANFILES)

veryclean: clean
    rm -f $(VERYCLEANFILES)

LC_RNGs.o: generators.h LC_RNGs.h
EX_RNGs.o: generators.h EX_RNGs.h
discrep.o: generators.h discrep.h
RNG_factory.o: generators.h LC_RNGs.h EX_RNGs.h
util.o: util.h
sphere.o: sphere.h
rand.o: generators.h LC_RNGs.h EX_RNGs.h util.h RNG_factory.h
hitormiss.o: generators.h LC_RNGs.h EX_RNGs.h discrep.h util.h sphere.h
mc1d.o: generators.h LC_RNGs.h

和以下头文件

#ifndef _H_EX_RNGS
#define _H_EX_RNGS

#include <cstdlib>
#include <cmath>
#include <iostream>
#include "generators.h"
#include "gsl/include/gsl/gsl_rng.h"

namespace generators {

    class GSL_RAND: public RNG {
        gsl_rng *r;
    public:
        GSL_RAND();

        virtual unsigned int nextInt();

        /** Base deconstructor. */
        virtual ~GSL_RAND() {}

        virtual void setSeed( unsigned int seed );

        virtual unsigned int getMaximum();
    };

};

#endif

运行makefile时遇到的问题是

EX_RNGs.o: In function `generators::GSL_RAND::GSL_RAND()':
/home/school/rngmc/EX_RNGs.cc:34: undefined reference to `gsl_rng_rand'
/home/school/rngmc/EX_RNGs.cc:34: undefined reference to `gsl_rng_alloc'

以及程序中每次调用gsl函数时出现的类似错误。根据我的阅读，未定义的引用错误通常是由链接到必要文件时的错误引起的。映射gsl（我在makefile中链接到的）与makefile在同一个映射中，所以这应该没问题呢？我不知道我犯了什么错误？提前感谢您的帮助。

编辑：我不知道这是否有帮助，但是替换了makefile中的LDFLAGS和INCLDIRS行

LDFLAGS = -L/usr/local/lib -lgsl -lgslcblas -lm
INCLDIRS = -I/usr/local/include

也会出现相同的错误，即使usr / local目录中也存在gsl库。

Answer 1

你的问题很常见。这样：

$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(INCLDIRS)

应该是这样的：

$(CC) $(CFLAGS) $(INCLDIRS) -o $@ $^ $(LDFLAGS)

链接库（-l标志）应该在命令行中源文件（在您的情况下为$^）后。

GSL中未定义的引用，可能的链接错误？

1 个答案: