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c++gccmingwglibmsys2

Can't link GTKmm 3 app with minGW64 ithin MSYS2: ustring constructor not found

I was trying to compile my GTKmm 3 app on Windows. Get an error during compilation that Glib::ustring doesn't have a constructor 

    Glib:: ustring:: ustring(std::string*)

although the code gets compiled successfully on Ubuntu.

Sample code:

#include <gtkmm.h>
#include <string>

int main()
{
    std::string a("aa");
    Glib::ustring b(a);
    return 0;
}

Compiling with: 

g++ -std=c++14  -c test.cpp `pkg-config gtkmm-3.0 --cflags` && \
g++ test.o `pkg-config --libs gtkmm-3.0`

Output (on Windows 10 x64, MSYS2 MinGW64):

test.o:test.cpp:(.text+0x51): undefined reference to `Glib::ustring::ustring(std::string const&)'
test.o:test.cpp:(.text+0x51): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `Glib::ustring::ustring(std::string const&)'
collect2: error: ld returned 1 exit status

Windows: Glib 2.50.3, Glibmm 2.50.0, GCC 5.3.0 (MinGW 64bit)
Ubuntu: Glib 2.48.1, Glibmm 2.46.3, GCC 5.4.0

Solution

  • The problem was that I used wrong gcc.

    which gcc showed that I was using MSYS2 GCC instead of MINGW64 GCC.

    Solved by installing proper GCC/MinGW64: pacman -S mingw-w64-x86_64-toolchain