Porting libgccjit to Windows: Challenges, Licensing, and Practical Insights
libgccjit, an embedded GCC JIT library, has been experimentally ported to Windows, with developers overcoming libtool and Automake differences, handling DLL creation, and noting GPLv3 licensing implications, demonstrating the feasibility of GCC JIT on Windows despite limited adoption prospects.
libgccjit is an embedded library implementing GCC JIT compilation, allowing dynamic linking to bytecode interpreters and other programs to generate native code at runtime.
Developers have experimentally ported libgccjit to Windows and submitted a patch, successfully testing it in Emacs's local compilation branch, indicating it can run well on Windows.
During the port, differences in libtool and Automake required workarounds, such as copying lib/libgccjit.so to bin/libgccjit.dll because creating a DLL directly was not possible, and the Windows build does not need the --enable-host-shared option.
The GCC codebase is licensed under the “viral” GPLv3, meaning that even if libgccjit runs on Windows, few Windows programs will adopt it due to the requirement to open‑source derivative works, though the experience shows that cross‑platform open‑source projects can potentially use GCC JIT on Windows.
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