我一直在尝试编译我的项目,但遇到了undefined reference
错误。 例如:
installertest.cpp:(.text+0x9d1): undefined reference to `XmlRpcValue::makeArray()'
...
installertest.cpp:(.text+0xede): undefined reference to `dbcancel'
installertest.cpp:(.text+0xefd): undefined reference to `dbfcmd'
installertest.cpp:(.text+0xf0f): undefined reference to `dbsqlexec'
installertest.cpp:(.text+0xf2d): undefined reference to `SHA1_Init'
...
我的命令行是:
g++ -o installertest
-lsybdb
-lxmlrpc
-lxmlrpc_cpp
-lxmlrpc_xmlparse
-lxmlrpc_xmltok
-lxmlrpc_util
-lxmlrpc++
-lxmlrpc_server_cgi
-lssl
-std=c++0x
ContractData.o installertest.o
objdump -T
显示符号位于 .so 文件中。 例如:
libsybdb.so:
...
0000000000011c30 g DF .text 0000000000000083 Base dbcancel
...
/usr/lib/libxmlrpc_cpp.so:
...
0000000000002e78 g DF .text 0000000000000092 Base _ZN11XmlRpcValue9makeArrayEv
...
strace
显示链接器正在打开和读取库文件:
...
[pid 5019] stat("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libsybdb.so", {st_mode=S_IFREG|0644, st_size=421608, ...}) = 0
[pid 5019] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libsybdb.so", O_RDONLY) = 7
[pid 5019] fcntl(7, F_GETFD) = 0
[pid 5019] fcntl(7, F_SETFD, FD_CLOEXEC) = 0
[pid 5019] fstat(7, {st_mode=S_IFREG|0644, st_size=421608, ...}) = 0
[pid 5019] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b16c200c000
[pid 5019] lseek(7, 0, SEEK_SET) = 0
[pid 5019] read(7, "177ELF211 3 >