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Thread: Problems linking gsl 2.1

  1. #1
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    Default Problems linking gsl 2.1

    I'm using Qt 5.8 and gsl 2.1 (compiled with cygwin64), this is what i use in the .pro file to link gsl:

    INCLUDEPATH+=C:/gsl/include/
    INCLUDEPATH += C:/gsl/LIBS
    LIBS += -LC:/gsl/lib -lgsl -lgslcblas -lm

    when i include the headers and compile i don't have any problem even when i declare and object, but when i tray to use any function i got this error:

    C:\Users\CIFAS-1\untitled4\mainwindow.cpp:9: error: undefined reference to `gsl_matrix_alloc'.

    Please any one has some idea?

  2. #2
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    Default Re: Problems linking gsl 2.1

    Have you tried putting an environment extern "C" around the function declarations in your gsl header file?
    Qt Code:
    1. extern "C" {
    2. ...
    3. gsl_matrix_alloc();
    4. ...
    5. }
    To copy to clipboard, switch view to plain text mode 

    It's only a guess. I just saw that in gsl_matrix_double.h from the GSL source, this actually should already be declared in C++.

  3. #3
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    Default Re: Problems linking gsl 2.1

    compiled with cygwin64
    And is your app also built with the gcc compiler from your cygwin distro? From the error message, this looks like a Visual Studio linker error. The two compilers are incompatible - you must build all binaries with either one or the other, can't mix and match.
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  4. #4
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    Default Re: Problems linking gsl 2.1

    No my app was built with the mingw compiler from Qt (the deafult compiler) in windows

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