Compile with dynamic Qt libraries and static gcc libraries under Linux



  • Hi all

    I'm trying to compile my Qt application by using Qt libraries in dynamic mode and, in my intention, by linking statically all other gcc libraries (like, for example, libstdc++). Unfortunately I still didn't find a way for this.

    Currently I made some test using the QMAKE_LFLAGS option into the Qt Creator .pro file as follow:

    @QMAKE_LFLAGS += -static-libstdc++@

    but using the ldd tool I can see the libstdc++ is still linked dynamically (libstdc++.so.6). If I try the following solution:

    @QMAKE_LFLAGS += -static@

    The linker return error since want to have all the libraries in static format and, obviously, doesn't find the Qt static libraries.

    Someone know the correct way to make such result?

    Thank you


  • Moderators

    AFAIK, g++ automatically links the first std library it finds: static or shared. Modify your path to point to libstdc++.a first, then to the shared one.



  • Hi

    Thank you for your help.

    At which level I should to modify path? (linker?) Something like:

    @QMAKE_LFLAGS += -Wl,-rpath,/path_to_static_libstdc++/@


  • Moderators

    Are you sure you have static libstdc+ available on your system?



  • Yes, is in the following path:

    @/usr/lib/gcc/i486-linux-gnu/4.7/libstdc++.a@



  • No one have a suggestion about?



  • I'm still facing this issue.

    Tried add this flag:

    @QMAKE_LFLAGS += -static-libgcc -static-libstdc++@

    but no effect, libstdc++ still linked dynamically.

    Tried also:

    @QMAKE_LFLAGS += -Wl,-b-static-libgcc -Wl,-b-static-libstdc++@

    but linker return this error:

    @:-1: error: invalid BFD target `-static-libstdc++'@

    I can't believe there is no way to link statically libstdc++


  • Lifetime Qt Champion

    Hi,

    What about giving the full path to the library ?

    IIRC something like:

    @LIBS += /usr/lib/gcc/i486-linux-gnu/4.7/libstdc++.a@



  • Hi

    Thank you for your reply.

    Unfortunately your suggestion doesn't work, libstdc++ still linked dynamically. I already tried similar test by additing the

    @LIBS += -L/usr/lib/gcc/i486-linux-gnu/4.7@

    flasg bug same result...


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