linker-errors - w3toppers.com

Duplicate Symbols for Architecture arm64

For me it helped to switch the “No Common Blocks” compiler setting to NO: It pretty much seems to make sense, the setting is explained here: What is GCC_NO_COMMON_BLOCKS used for?

Function already defined error in C++

By default, these functions have external linkage. That means each translation unit has functions called double round(double r) and float round(float r), which causes a name collision at link time. Some possible solutions are: Declare the functions as static, which implies internal linkage Inline the functions Move the implementation out of the header and into … Read more

Linking files in g++

You probably tried to either compile and link instead of just compiling source files or somehow forgot something. Variation one (everything in one line; recompiles everything all the time): g++ -o myexecutable first.cpp second.cpp third.cpp [other dependencies, e.g. -Lboost, -LGL, -LSDL, etc.] Variation two (step by step; if no -o is provided, gcc will reuse … Read more

Referencing memory operands in .intel_syntax GNU C inline assembly

Compile with gcc -masm=intel and don’t try to switch modes inside the asm template string. AFAIK there’s no equivalent before clang14 (Note: MacOS installs clang as gcc / g++ by default.) Also, of course you need to use valid GNU C inline asm, using operands to tell the compiler which C objects you want to … Read more

Trying to include a library, but keep getting ‘undefined reference to’ messages

The trick here is to put the library AFTER the module you are compiling. The problem is a reference thing. The linker resolves references in order, so when the library is BEFORE the module being compiled, the linker gets confused and does not think that any of the functions in the library are needed. By … Read more

Cuda C – Linker error – undefined reference

You have a problem with symbol name mangling. nvcc uses the host C++ compiler to compile host code, and this implies that symbol name mangling is applied to code emitted by the CUDA toolchain. There are two solutions to this problem. The first is to define dummy_gpu using C linkage, so change your my_cuda.cu to … Read more

Multiple definition of … linker error

Don’t define variables in headers. Put declarations in header and definitions in one of the .c files. In config.h extern const char *names[]; In some .c file: const char *names[] = { “brian”, “stefan”, “steve” }; If you put a definition of a global variable in a header file, then this definition will go to … Read more

Using pthread in c++

You might try using the -pthread option to g++. -pthread Adds support for multithreading with the pthreads library. This option sets flags for both the preprocessor and linker.

Linker Error in iOS (duplicate symbols for architecture x86_64)

If not mistaken, you are using the sdk which just released by Facebook at September 10th, 2015 which named as FacebookSDKs-iOS-20150910.zip. Try to use sdk that released at August 13th, 2015 which named as FacebookSDKs-iOS-20150813.zip and report to Facebook about the duplication problem if you can. Thank you.

Unable to compile Rust hello world on Windows: linker link.exe not found

I downloaded and installed the Build Tools for Visual Studio 2019. During installation I selected the C++ tools. It downloaded almost 5GB of data. I restarted the machine after installation and compiling the code worked fine: > cargo run Compiling helloworld v0.1.0 (C:\Users\DELL\helloworld) Finished dev [unoptimized + debuginfo] target(s) in 12.05s Running `target\debug\helloworld.exe` Hello, world!