Why Does My C Code Produce 'Undefined Symbols' Errors on macOS, and How Can I Fix Them?

Error while Compiling C Code: Undefined Symbols

When compiling C code on macOS Lion, errors related to undefined symbols indicate that the compiler is linking the code against the C standard library (-lcrt1.10.6.o) instead of the C standard library (-lstdc .6.dylib).

Cause:

This error typically occurs when using the C front-end (gcc) to compile C code, resulting in incorrect linking against the appropriate libraries.

Solution:

To resolve this error, use the C compiler (g or clang ) to compile the code. These compilers handle C syntax and automatically link against the C standard library, preventing the undefined symbol errors.

Example using g :

$ g++ main.cpp -o main

Example using clang :

$ clang++ main.cpp -o main

After compiling with the correct compiler, you should no longer encounter the undefined symbol errors. The output of the -v flag, which displays the linker invocation, can be used to verify that the proper standard libraries are being linked.

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