Error when compiling QXmpp library on Qt 5.4

Question

I try since this morning to compile a XMPP library for QT calles qxmpp.

I try to use Qt Creator and do a Build All, but the compiler can't find a thing called -lqxmpp0 and I don't know what it is. Google wasn't helpful unfortunately.

My Qt window:

github Library

Thanks for your help in advance.

Answer 1

-llibrary -l library

Search the library named library when linking. (The second alternative with the library as a separate argument is only for POSIX compliance and is not recommended.)

It makes a difference where in the command you write this option; the linker searches and processes libraries and object files in the order they are specified. Thus, ‘foo.o -lz bar.o’ searches library ‘z’ after file foo.o but before bar.o. If bar.o refers to functions in ‘z’, those functions may not be loaded.

The linker searches a standard list of directories for the library, which is actually a file named liblibrary.a. The linker then uses this file as if it had been specified precisely by name.

The directories searched include several standard system directories plus any that you specify with -L.

Normally the files found this way are library files—archive files whose members are object files. The linker handles an archive file by scanning through it for members which define symbols that have so far been referenced but not defined. But if the file that is found is an ordinary object file, it is linked in the usual fashion. The only difference between using an -l option and specifying a file name is that -l surrounds library with ‘lib’ and ‘.a’ and searches several directories.

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https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html

Answer 2

Please check if in the qxmpp.pri have something like this define:

QXMPP_INCLUDEPATH = $$PWD/src/base $$PWD/src/client $$PWD/src/server

# Determine library name
CONFIG(debug, debug|release) {
    QXMPP_LIBRARY_NAME = qxmpp_d
} else {
    QXMPP_LIBRARY_NAME = qxmpp
}

# Determine library type (shared or staticlib)
isEmpty(QXMPP_LIBRARY_TYPE) {
    android | ios {
        QXMPP_LIBRARY_TYPE = staticlib
    } else {
        QXMPP_LIBRARY_TYPE = shared
    }
}

has you see the QXMPP_LIBRARY_NAME defines the name of the library, also check if in the examples.pro is included qxmpp.pri. I hope my answer can help.