【发布时间】：2012-03-27 09:37:34
【问题描述】：
以下是 make 链接输出。 它显示符号引用错误，即使我提供了 libmysqlclient_r.so 的路径
如果我将它链接到 libmysqlclient.so 那么它工作正常。但由于我的程序使用多线程，我想链接 libmysqlclient_r.so
g++ -L/usr/local/lib -L/lib/64 -L/opt/mysql/mysql/lib -L../../dependencies/glog/lib -L../../dependencies/libevent/lib -L../../dependencies/json/jsoncpp/lib -ljson-gcc-3.4.3_libmt -levent -lglog -lz -lmysqlclient_r -lpthread -lnsl -lumem -lmysys -lmystrings -o ../../dbprocess/bin/dbprocess dbprocess.o sessionlookupcsidrequest.o sessionlookupipv4request.o ../dbframework/connectionpool.o ../dbframework/connectionproxy.o ../dbframework/dbconnection.o ../framework/rpcmethod.o ../framework/rpcmethoddispatcher.o ../framework/rpcmethodfactory.o ../framework/jsonmethod.o ../framework/libeventmethoddispatcher.o ../framework/tobject.o ../framework/acceptor.o ../framework/configuefile.o ../framework/connmethoddata.o
Undefined first referenced
symbol in file
mysql_error ../dbframework/dbconnection.o
mysql_close ../dbframework/dbconnection.o
mysql_stmt_store_result sessionlookupcsidrequest.o
mysql_stmt_close ../dbframework/dbconnection.o
mysql_stmt_fetch sessionlookupcsidrequest.o
mysql_stmt_error sessionlookupcsidrequest.o
mysql_options ../dbframework/dbconnection.o
mysql_stmt_free_result sessionlookupcsidrequest.o
mysql_stmt_bind_result sessionlookupcsidrequest.o
mysql_stmt_num_rows sessionlookupcsidrequest.o
mysql_stmt_prepare ../dbframework/dbconnection.o
mysql_ping ../dbframework/dbconnection.o
mysql_init ../dbframework/dbconnection.o
mysql_stmt_bind_param sessionlookupcsidrequest.o
mysql_real_connect ../dbframework/dbconnection.o
mysql_stmt_execute sessionlookupcsidrequest.o
mysql_stmt_init ../dbframework/dbconnection.o
ld: fatal: Symbol referencing errors. No output written to ../../dbprocess/bin/dbprocess
collect2: ld returned 1 exit status
make: *** [../../dbprocess/bin/dbprocess] Error 1
下面是make文件
CPP = g++
LD = $(CPP)
OBJS = dbprocess.o sessionlookupcsidrequest.o sessionlookupipv4request.o ../dbframework/connectionpool.o ../dbframework/connectionproxy.o ../dbframework/dbconnection.o ../framework/rpcmethod.o ../framework/rpcmethoddispatcher.o ../framework/rpcmethodfactory.o ../framework/jsonmethod.o ../framework/libeventmethoddispatcher.o ../framework/tobject.o ../framework/acceptor.o ../framework/configuefile.o ../framework/connmethoddata.o
CPPFLAGS = -g $(INCFLAGS) -c -Wall -pthreads
LDFLAGS = -L/usr/local/lib -L/lib/64 -L/opt/mysql/mysql/lib/ -L../../dependencies/mysql/lib/solaris -L../../dependencies/glog/lib -L../../dependencies/libevent/lib -L../../dependencies/json/jsoncpp/lib -ljson-gcc-3.4.3_libmt -levent -lglog -lz -lmysqlclient_r -lpthread -lnsl -lumem -lmysys -lmystrings
LIB = ../../dbprocess/bin/dbprocess
INCFLAGS = -I../includes -I/opt/mysql/mysql/include -I../../dependencies/glog/include -I../../dependencies/json/jsoncpp/include -I../../dependencies/libevent/include
all : $(LIB)
$(LIB) : $(OBJS)
$(LD) $(LDFLAGS) -o $(LIB) $(OBJS)
%.o: ../%.cpp
$(CPP) $(CPPFLAGS) $<
clean :
rm -r -f $(LIB) $(OBJS)
尝试了不同的标志，但仍然没有变化。请推荐
【问题讨论】：
-
尝试在最后的链接中将
LDFLAGS（命名错误）放在OBJS之后。 -
你的意思是像 $(LD) -o $(LIB) $(OBJS) $(LDFLAGS)
-
我已经尝试如上它给出以下错误：
ld: warning: file /usr/lib/libmysqlclient_r.a(libmysql.o): wrong ELF class: ELFCLASS64 Undefined first referenced symbol in file same as above ld: fatal: Symbol referencing errors. No output written to ../../dbprocess/bin/dbprocess collect2: ld returned 1 exit status make: *** [../../dbprocess/bin/dbprocess] Error 1 -
这意味着您正在混合 32 位二进制文件和 64 位二进制文件。不要那样做。
-
如果您看到上面的错误 libmysqlclient_r.a(libmysql.o) ，我不想链接到 .a 但 .so 因此我删除了 libmysqlclient_r.a 并再次犯了同样的错误，但与 .so
ld：致命：文件/opt/mysql/mysql/lib/libmysqlclient_r.so：错误的ELF类：ELFCLASS64 ld：致命：文件处理错误。没有输出写入 ../../dbprocess/bin/dbprocess collect2: ld 返回 1 退出状态 make: *** [../../dbprocess/bin/dbprocess] 错误 1
标签： c++ c mysql-connector libmysql