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following is the make linking output. it shows Symbol referencing errors, even though I have provided path for libmysqlclient_r.so

If I link it to libmysqlclient.so then it works fine. But as my program uses multithreading, I want to link 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

following is the make file 

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)

Tried with different flags but still no change. Please suggest

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1 回答 1

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您的问题可能是您将对象和库传递给ld（或ld通过g++）的顺序很重要，并且您在-lmysqlclient_r依赖它的目标文件之前指定。您应该尝试将所有-l参数移动到行尾之后*.o，即将您的makefile步骤更改为

（取两个 - 实际上是 Mat 从评论中的观点：您已将库链接放在 LDFLAGS 变量中）

$(LIB) : $(OBJS)
$(LD) -o $(OBJS) $(LIB) $(LDFLAGS)
于 2012-03-27T10:25:18.277 回答