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POLinked cannot find symbols, but libraries are read and symbols exist
 

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  1. POLinked cannot find symbols, but libraries are read and symbols exist
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    <p>I've been trying to compile my project and I'm getting <code>undefined reference</code> errors. eg.:</p> <pre><code>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' ... </code></pre> <p>My command-line is:</p> <pre><code>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 </code></pre> <p><code>objdump -T</code> shows that the symbols are in the .so file. eg.:</p> <pre><code>libsybdb.so: ... 0000000000011c30 g DF .text 0000000000000083 Base dbcancel ... /usr/lib/libxmlrpc_cpp.so: ... 0000000000002e78 g DF .text 0000000000000092 Base _ZN11XmlRpcValue9makeArrayEv ... </code></pre> <p><code>strace</code> shows that the library files are being opened and read by the linker:</p> <pre><code>... [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, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0&gt;\0\1\0\0\0P\237\0\0\0\0\0\0"..., 4096) = 4096 ... [pid 5019] stat("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/libxmlrpc.so", {st_mode=S_IFREG|0644, st_size=80936, ...}) = 0 [pid 5019] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/libxmlrpc.so", O_RDONLY) = 8 [pid 5019] fcntl(8, F_GETFD) = 0 [pid 5019] fcntl(8, F_SETFD, FD_CLOEXEC) = 0 [pid 5019] fstat(8, {st_mode=S_IFREG|0644, st_size=80936, ...}) = 0 [pid 5019] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b16c200d000 [pid 5019] lseek(8, 0, SEEK_SET) = 0 [pid 5019] read(8, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0&gt;\0\1\0\0\0\300?\0\0\0\0\0\0"..., 4096) = 4096 ... </code></pre> <p>All files involved are targeted to x86-64 and the header for the C libraries are <code>extern "C"</code>. I have tried everything I can think of and it still won't link.</p> <p>I've even tried removing all C++11 code and compiling without the command-line switch, still nothing.</p> <p>My system is <strong>Ubuntu Precise (12.04) 64-bit</strong> using <strong>g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3</strong> if that helps. All packages were installed from the package manager and development packages are installed.</p> <p><strong>Edit (2017-05-30)</strong>: <em>Marked as duplicate of <a href="https://stackoverflow.com/questions/45135/why-does-the-order-in-which-libraries-are-linked-sometimes-cause-errors-in-gcc_">https://stackoverflow.com/questions/45135/why-does-the-order-in-which-libraries-are-linked-sometimes-cause-errors-in-gcc</em></a><br/> Other question asks why order of arguments is important. Argument order was not known to be an issue when question was asked.<br/> Also, previous question does not contain any helpful expansion, whereas this question shows the issue at hand.<br/> Previous question may be seen as a helpful expansion on the answer to this one, but not a duplication.</p>
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