#include folder needed to link app

9 messages · Page 1 of 1 (latest)

rugged tiger
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hey!
can someone explain me why removing the -I flags generates a linking error? and with only two functions

g++ -I./ftxui/include -o main.cpp.o -c src/main.cpp

when i run this command to generate the object file, everything works, but without the -I flag, i get this linking error when i try to link my app:

main.cpp:(.text+0x7a3): undefined reference to `ftxui::window(std::shared_ptr<ftxui::Node>, std::shared_ptr<ftxui::Node>, ftxui::BorderStyle)'
/usr/bin/ld: main.cpp.o: in function `main':
main.cpp:(.text+0xec3): undefined reference to `ftxui::size(ftxui::WidthOrHeight, ftxui::Constraint, int)'
/usr/bin/ld: main.cpp:(.text+0xf9a): undefined reference to `ftxui::Screen::ToString[abi:cxx11]() const'
collect2: error: ld returned 1 exit status
make: *** [Makefile:3: build] Error

include folder doesn't contains implementation of Screen::ToString, only declaration:

class Screen {
 public:
   // ...
   std::string ToString();
   // ...
}
strong parcelBOT
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trim latch
rugged tiger
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but it only happens with these specific functions, i use other functions from ftxui, and i don't need the include folder in order to link the app

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i even use Screen::Create without any issue, but Screen::ToString no

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ok no, i commented out the line with Screen::Create, and i have a shit ton of linking errors
this line was "hiding" other errors

trim latch
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As to the include not being needed, that’s because the object file includes the linker-readable names of the functions, and the missing errors are probably because the linker bailed, or the compiler decided those paths weren’t being used in the optimization phase

rugged tiger
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okok thanks for the clarifications !

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!solved