首先我想说的是，我在网站上寻找了针对该问题的所有解决方案，但没有运气！
我有一个正在尝试编译的项目，当我在 Ubuntu 14 上编译它时一切正常，但是当我尝试在 ubuntu 18 或 20 上编译同一个项目时，我收到以下错误：
collect2: error: ld returned 1 exit status
或者更具体地说，这是我运行命令“make target=x64”时得到的结果：
make target=x64
gcc -o x64/multics -s -ggdb3 -m64 -O3 -I. -fpack-struct -DCHECK_NEXTDCW -DSID_FILTER -DNEWCACHE -DCCCAM_CLI -DRADEGAST_CLI -DCAMD35_CLI -DCS378X_CLI -DHTTP_SRV -DTELNET -DMGCAMD_SRV -DCCCAM_SRV -DCAMD35_SRV -DCS378X_SRV -DEXPIREDATE -DDCWSWAP -DCACHEEX -DIPLIST -DTESTCHANNEL -DTHREAD_DCW -DEPOLL_NEWCAMD -DEPOLL_CCCAM -DEPOLL_MGCAMD -DEPOLL_ECM -DPEERLIST -DECMLIST -DFREECCCAM_SRV -DEPOLL_FREECCCAM -DGIT_COMMIT=\"NANO-E0-beta\" -DSRV_CSCACHE -DEPOLL_NEWCAMD -DEPOLL_ECM x64/sha1.o x64/des.o x64/md5.o x64/aes.o x64/dcw.o x64/convert.o x64/tools.o x64/debug.o x64/parser.o x64/ipdata.o x64/threads.o x64/sockets.o x64/msg-newcamd.o x64/msg-cccam.o x64/msg-radegast.o x64/config.o x64/ecmdata.o x64/httpserver.o x64/telnet.o x64/main.o -lpthread
/usr/bin/ld: x64/main.o: in function `cache_setdcw':
/root/multics/x64/../clustredcache.c:1542: undefined reference to `isnullDCW'
/usr/bin/ld: x64/main.o: in function `cache_fetch_samechannel':
/root/multics/x64/../clustredcache.c:1425: undefined reference to `isnullDCW'
/usr/bin/ld: x64/main.o: in function `cache_pipe_recvmsg':
/root/multics/x64/../clustredcache.c:2368: undefined reference to `isnullDCW'
/usr/bin/ld: x64/main.o: in function `cache_thread':
/root/multics/x64/../clustredcache.c:2725: undefined reference to `cache_recvmsg'
/usr/bin/ld: x64/main.o: in function `cc_cli_recvmsg':
/root/multics/x64/../srv-cccam.c:1116: undefined reference to `cc_cli_parsemsg'
/usr/bin/ld: x64/main.o: in function `cacheex_pipe_recvmsg':
/root/multics/x64/../cacheex.c:294: undefined reference to `cacheex_push'
/usr/bin/ld: /root/multics/x64/../cacheex.c:279: undefined reference to `cacheex_push'
/usr/bin/ld: x64/main.o: in function `cc_srv_recvmsg':
/root/multics/x64/../cli-cccam.c:392: undefined reference to `checkECMD5'
/usr/bin/ld: /root/multics/x64/../cli-cccam.c:395: undefined reference to `cacheex_check'
collect2: error: ld returned 1 exit status
make: *** [Makefile:166: link] Error 1
Makefile 的内容如下：
GIT_VERSION := NANO-E0-$(shell git describe --abbrev=7 --dirty --always --tags)
OPTS = -DCHECK_NEXTDCW -DSID_FILTER -DNEWCACHE \
-DCCCAM_CLI -DRADEGAST_CLI -DCAMD35_CLI -DCS378X_CLI \
-DHTTP_SRV -DTELNET -DMGCAMD_SRV -DCCCAM_SRV -DCAMD35_SRV -DCS378X_SRV \
-DEXPIREDATE -DDCWSWAP -DCACHEEX -DIPLIST -DTESTCHANNEL -DTHREAD_DCW \
-DEPOLL_NEWCAMD -DEPOLL_CCCAM -DEPOLL_MGCAMD -DEPOLL_ECM -DPEERLIST \
-DECMLIST -DFREECCCAM_SRV -DEPOLL_FREECCCAM \
-DGIT_COMMIT=\"$(GIT_VERSION)\" -DSRV_CSCACHE
## -DEPOLL_CACHE
## -DTESTCHANNEL -DDEBUG_NETWORK -DDEBUG_NETWORK2 -DMONOTHREAD_ACCEPT
## -DRADEGAST_SRV -DFREECCCAM_SRV -DEPOLL_CACHE
## -DMULTICONNECT -DRECVMSG_BLOC -DIPLIST
## -DCLI_CSCACHE -DSRV_CSCACHE
ifeq ($(target),x32)
CC = gcc
OUTPUT = x32
CFLAGS = -s -ggdb3 -m32 -O3 -I. $(OPTS) -DEPOLL_NEWCAMD -DEPOLL_ECM -std=gnu90
LFLAGS = $(CFLAGS)
else
ifeq ($(target),x64)
CC = gcc
OUTPUT = x64
CFLAGS = -s -ggdb3 -m64 -O3 -I. -fpack-struct $(OPTS) -DEPOLL_NEWCAMD -DEPOLL_ECM
LFLAGS = $(CFLAGS)
else
ifeq ($(target),ppc-old)
CC = /root/Desktop/tuxbox-cvs/root/cdk/bin/powerpc-tuxbox-linux-gnu-gcc
OUTPUT = ppc-old
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DINOTIFY -DSTB
LFLAGS = $(CFLAGS)
else
ifeq ($(target),ppc)
CC = /opt/powerpc-tuxbox-linux-gnu/bin/powerpc-linux-gcc
OUTPUT = ppc
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DINOTIFY -DSTB
LFLAGS = $(CFLAGS)
else
ifeq ($(target),mipsel)
CC = /opt/mipsel-unknown-linux-gnu/bin/mipsel-unknown-linux-gnu-gcc
OUTPUT = mipsel
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB -EL -march=mips1
LFLAGS = $(CFLAGS)
else
ifeq ($(target),mipsel-pli4)
CC = /opt/mipsel-tuxbox-linux-gnu/bin/mipsel-tuxbox-linux-gnu-gcc
OUTPUT = mipsel-pli4
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB -DEPOLL_NEWCAMD -DEPOLL_ECM
LFLAGS = $(CFLAGS)
else
ifeq ($(target),sparc)
CC = sparc-linux-gnu-gcc-4.7
OUTPUT = sparc
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB
LFLAGS = $(CFLAGS)
else
ifeq ($(target),sparc64)
CC = sparc64-linux-gnu-gcc
OUTPUT = sparc64
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB
LFLAGS = $(CFLAGS)
else
ifeq ($(target),sh4)
CC = /opt/STM/STLinux-2.4/devkit/sh4/bin/sh4-linux-gcc
OUTPUT = sh4
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DST_7201 -DST_OSLINUX -DARCHITECTURE_ST40 -DSTB -DEPOLL_NEWCAMD -DEPOLL_ECM
LFLAGS = $(CFLAGS)
else
ifeq ($(target),rpi)
# CC = /opt/tools-master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc
CC = gcc
OUTPUT = rpi
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DEPOLL_NEWCAMD -DEPOLL_ECM -DNOPACK
LFLAGS = $(CFLAGS)
else
ifeq ($(target),arm-coolstream)
CC = /opt/arm-cx2450x-linux-gnueabi/bin/arm-cx2450x-linux-gnueabi-gcc
OUTPUT = arm-coolstream
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB -fPIC
LFLAGS = $(CFLAGS)
else
ifeq ($(target),mips-uclibc)
CC = /opt/cross-compiler-mips/bin/mips-gcc
OUTPUT = mips-uclibc
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB -fPIC
LFLAGS = $(CFLAGS)
else
ifeq ($(target),armeb)
CC = /opt/OpenWrt-SDK-ixp4xx-2.6-for-Linux-i686/staging_dir_armeb/bin/armeb-linux-uclibc-gcc
OUTPUT = armeb
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DINOTIFY -DSTB
LFLAGS = $(CFLAGS)
else
ifeq ($(target),aarch64)
CC = aarch64-linux-gnu-gcc
OUTPUT = aarch64
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB -DEPOLL_NEWCAMD -DEPOLL_ECM
LFLAGS = $(CFLAGS)
else
ifeq ($(target),fritzbox)
CC = /opt/gcc-4.2.1-uClibc-0.9.29/mipsel-linux-uclibc/bin/mipsel-linux-uclibc-gcc-4.2.1
OUTPUT = fritzbox
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB
LFLAGS = $(CFLAGS)
else
ifeq ($(target),mips64)
CC = mips64-linux-gnu-gcc
OUTPUT = mips64
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB -DEPOLL_NEWCAMD -DEPOLL_ECM
LFLAGS = $(CFLAGS)
else
ifeq ($(target),ppc64el)
CC = powerpc64le-linux-gnu-gcc
OUTPUT = ppc64el
CFLAGS = -s -ggdb3 -O2 $(OPTS) -DSTB -DEPOLL_NEWCAMD -DEPOLL_ECM
LFLAGS = $(CFLAGS)
else
ifeq ($(target),win32)
CC = /usr/bin/i586-mingw32msvc-gcc
OUTPUT = win32
CFLAGS = -s -ggdb3 -O2 $(OPTS)
LFLAGS = $(CFLAGS) -D__USE_W32_SOCKETS -D_WIN32_WINDOWS=0x0501 -lws2_32 -lpthread --disable-stdcall-fixup -mno-cygwin
else
CC = gcc
OUTPUT = x
CFLAGS = -s -ggdb3 -O3 -m64 -I. -fpack-struct $(OPTS) -D_GNU_SOURCE # -DSIG_HANDLER ## -DRECVMSG_BLOCK ## -DICACHE # -DCACHEEX_CWCYCLE ## ## -D_FORTIFY_SOURCE=0
LFLAGS = $(CFLAGS)
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
endif
ifndef name
NAME = multics
else
AOUT = $(name)
endif
OBJECTS = $(OUTPUT)/sha1.o $(OUTPUT)/des.o $(OUTPUT)/md5.o $(OUTPUT)/aes.o \
$(OUTPUT)/dcw.o $(OUTPUT)/convert.o $(OUTPUT)/tools.o $(OUTPUT)/debug.o $(OUTPUT)/parser.o $(OUTPUT)/ipdata.o \
$(OUTPUT)/threads.o $(OUTPUT)/sockets.o $(OUTPUT)/msg-newcamd.o $(OUTPUT)/msg-cccam.o $(OUTPUT)/msg-radegast.o $(OUTPUT)/config.o \
$(OUTPUT)/ecmdata.o $(OUTPUT)/httpserver.o $(OUTPUT)/telnet.o $(OUTPUT)/main.o
link: $(OBJECTS)
$(CC) -o $(OUTPUT)/$(NAME) $(LFLAGS) $(OBJECTS) -lpthread
cp $(OUTPUT)/$(NAME) multics/$(NAME).$(OUTPUT)
%.o: ../%.c Makefile common.h config.h ecmdata.h
$(CC) -c $(CFLAGS) $< -o $@
$(OUTPUT)/httpserver.o: httpserver.h httpbuffer.c httpserver.c
$(OUTPUT)/main.o: main.c Makefile common.h httpserver.h config.h clustredcache.c cacheex.c pipe.c pipe.h \
th-ecm.c th-cfg.c th-dns.c th-date.c th-srv.c \
srv-cccam.c srv-newcamd.c srv-mgcamd.c srv-radegast.c srv-freecccam.c srv-camd35.c srv-cs378x.c \
cli-common.c cli-cccam.c cli-newcamd.c cli-radegast.c cli-camd35.c cli-cs378x.c
all:
$(MAKE) target=ppc-old
$(MAKE) target=ppc
$(MAKE) target=mipsel
$(MAKE) target=mipsel-pli4
$(MAKE) target=sh4
$(MAKE) target=sparc
$(MAKE) target=arm-coolstream
$(MAKE) target=rpi
$(MAKE) target=fritzbox
$(MAKE) target=armeb
$(MAKE) target=aarch64
$(MAKE) target=ppc64el
clean:
-rm $(OUTPUT)/*
cleanall:
$(MAKE) clean
$(MAKE) target=x64 clean
$(MAKE) target=x32 clean
$(MAKE) target=ppc-old clean
$(MAKE) target=ppc clean
$(MAKE) target=mipsel clean
$(MAKE) target=mipsel-pli4 clean
$(MAKE) target=sh4 clean
$(MAKE) target=sparc clean
$(MAKE) target=arm-coolstream clean
$(MAKE) target=rpi clean
$(MAKE) target=fritzbox clean
$(MAKE) target=armeb clean
$(MAKE) target=aarch64 clean
$(MAKE) target=ppc64el clean
-rm multics/*
那么为什么相同的项目编译在 Ubuntu 14 上没有任何问题，而在 Ubuntu 18 和 20 上却导致错误，我遗漏了什么吗？！
问候