Mar 11, 2019 · Having said that, it appears to work both ways round here on my Slackware64 box. Not sure why it works. I've certainly encountered undefined reference failures owing to incorrect order before. Anyway, give the following a go and see if it makes any difference. gcc test.c -lm Failing that, there's likely something faulty with your toolchain.
Apart from the causes already discussed, “undefined reference” may also occur because of the following reasons. #4) Wrong Project Type. When we specify wrong project types in C++ IDEs like the visual studio and try to do things that the project does not expect, then, we get “undefined reference”. #5) No Library It looks like you haven't included the headers to define the pardiso functions as using C linkage (no C++ mangling of the names). Also, it seems like a very bad idea to link against 3 incompatible OpenMP libraries and 2 incompatible Fortran run-time libraries in random order. Same problem will happen if a .c file tries to call a function defined in a .cpp file without declaring it with extern “C”.If this happens, ensure you have extern “C” in your header file and that the header file is actually included by the .cpp file before the function is defined. Nov 20, 2013 · undefined reference Posted by richard_damon on November 20, 2013 The other thing that can cause this is if you compile task.c as a cpp file, since task.h will then declare it extern “C”, but task.c won’t, the names won’t match to the linker. Jul 25, 2013 · When I also include the display.c file (#include "display.c") i got other Errors. Depending to display.c because the compiler miss some other Functions which are defined / declared in other C-Files. So my question is how can I told Eclipse to include the C-Files from the 3rd party Folders. Thanks Chris Aug 07, 2015 · Undefined reference means the compiler can't find the definition of the function. Make sure that you are compiling and linking both main.cpp and Dog.cpp (if you use an IDE you should have all files in the same project).
Nov 20, 2013 · undefined reference Posted by richard_damon on November 20, 2013 The other thing that can cause this is if you compile task.c as a cpp file, since task.h will then declare it extern “C”, but task.c won’t, the names won’t match to the linker.
Dec 19, 2010 · test.c:(.text+0x6b): undefined reference to `cos' collect2: ld returned 1 exit status What is weird is that when I try this (without the for loop) : float a = cos(3. 14); printf(" a = %f ", a); I get no errors Can anyone, please help me. Thank you in advance Apart from the causes already discussed, “undefined reference” may also occur because of the following reasons. #4) Wrong Project Type. When we specify wrong project types in C++ IDEs like the visual studio and try to do things that the project does not expect, then, we get “undefined reference”. #5) No Library It looks like you haven't included the headers to define the pardiso functions as using C linkage (no C++ mangling of the names). Also, it seems like a very bad idea to link against 3 incompatible OpenMP libraries and 2 incompatible Fortran run-time libraries in random order. Same problem will happen if a .c file tries to call a function defined in a .cpp file without declaring it with extern “C”.If this happens, ensure you have extern “C” in your header file and that the header file is actually included by the .cpp file before the function is defined.
Undefined reference to "WinMain@16" in C . Undefined reference to "WinMain@16" in Code::Blocks? Sal P. I am using codeblocks and I just started to try Windows
Nov 20, 2013 · undefined reference Posted by richard_damon on November 20, 2013 The other thing that can cause this is if you compile task.c as a cpp file, since task.h will then declare it extern “C”, but task.c won’t, the names won’t match to the linker.