undefined reference to `matplot::gca()'

[gitzone83]

Bug category

• bug - compilation error
• bug - compilation warning
• bug - runtime error
• bug - runtime warning
• bug - logic error

Describe the bug

I installed matplotplusplus using the following instructions from the official guide

mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-O2" -DMATPLOTPP_BUILD_EXAMPLES=OFF -DMATPLOTPP_BUILD_TESTS=OFF
sudo cmake --build . --parallel 2 --config Release
sudo cmake --install .

on Ubuntu 22.04 system with g++ 12 and cmake 3.22 under Eclipse 2023-12 IDE

Steps to Reproduce

just create a new cmake project with defaults, create a simple default project with the following code

#include

#include <matplot/matplot.h>
#include
#include

int main(int argc, char **argv) {

std::cout << "Hello World" << std::endl;

std::vector<int> y = {2, 4, 7, 7, 6, 3, 9, 7, 3, 5};
matplot::plot(y);

return 0;

}

and build it.

Output

Building in: /home/user/workspace-cpp/Project-Cmake/build/default
cmake --build . --target all
[ 50%] Linking CXX executable Project-Cmake
/usr/bin/ld: CMakeFiles/Project-Cmake.dir/Project-Cmake.cpp.o: in function auto matplot::plot<std::vector<int, std::allocator<int> >>(std::vector<int, std::allocator<int> >)': Project-Cmake.cpp:(.text._ZN7matplot4plotISt6vectorIiSaIiEEJEEEDaT_DpOT0_[_ZN7matplot4plotISt6vectorIiSaIiEEJEEEDaT_DpOT0_]+0x2c): undefined reference to matplot::gca()'
/usr/bin/ld: CMakeFiles/Project-Cmake.dir/Project-Cmake.cpp.o: in function std::shared_ptr<matplot::line> matplot::axes_type::plot<std::vector<int, std::allocator<int> > >(std::vector<int, std::allocator<int> > const&, std::basic_string_view<char, std::char_traits<char> >)': Project-Cmake.cpp:(.text._ZN7matplot9axes_type4plotISt6vectorIiSaIiEEEESt10shared_ptrINS_4lineEERKT_St17basic_string_viewIcSt11char_traitsIcEE[_ZN7matplot9axes_type4plotISt6vectorIiSaIiEEEESt10shared_ptrINS_4lineEERKT_St17basic_string_viewIcSt11char_traitsIcEE]+0x67): undefined reference to matplot::axes_type::plot(std::vector<double, std::allocator > const&, std::basic_string_view<char, std::char_traits >)'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/Project-Cmake.dir/build.make:97: Project-Cmake] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/Project-Cmake.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2
Build complete (5 errors, 0 warnings): /home/user/workspace-cpp/Project-Cmake/build/default

Platform

• cross-platform issue - linux
• cross-platform issue - windows
• cross-platform issue - macos

Environment Details:

• OS: ubuntu 22.04
• OS Version:
• Compiler: cmake 3.22
• Compiler version: gcc/g++ 12

Additional context

[lord-marcel]

I have the same issue

[HayatoTenryuu]

Same issue here, with both gca() and gcf(), though I'm on Windows 11.