Why Am I Getting the '64-bit mode not compiled in' Error When Using Cgo?

Underlying Cause of "64-bit mode not compiled in" Error in Cgo

When attempting to integrate C code into a Go program using Cgo, an error message "64-bit mode not compiled in" can arise. This indicates that the C compiler used during compilation lacks support for 64-bit mode, resulting in a clash with the Go build being executed in 64-bit.

Addressing the Issue

To resolve this issue, the issue, it is necessary to update the C compiler. While the g and gcc compilers appear to be installed, investigating version compatibility is vital.

Recommended Compiler Versions:

• For 32-bit and 64-bit Go builds on 64-bit Windows OS: tdm64-gcc-5.1.0-2.exe
• For 64-bit Go builds only (not 32-bit target on 64-bit OS): MinGW-w64 x64-4.8.1-release-posix-seh-rev5

Installation and Configuration:

1. Download and install the recommended C compiler.
2. Add the compiler's bin directory to the PATH environment variable to allow access from the command prompt.
3. Ensure that the compiler path is prioritized higher than any potentially conflicting paths in the PATH variable.

Additional Considerations:

• Use "where gcc" command: Run "where gcc" in command prompt to identify the currently active version of gcc. If multiple versions exist, prioritize the desired version or remove conflicting ones.
• Consult Online Resources: Refer to resources such as "Differences between Mingw-w64 and TDM-GCC for a simple GDI project" and "What is the difference between Orwell's MinGW and TDM Dev-C versions?" for further clarification on compiler compatibility.

By implementing these steps, developers can resolve the "64-bit mode not compiled in" error and successfully integrate C code into their Go programs.

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