Linux 6.19 Goes Ahead and Enables Microsoft C Extensions Support

7 days ago

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Linux 6.19 enables Microsoft C Extensions support by setting the -fms-extensions compiler option.
Microsoft C Extensions allow non-standard C/C++ constructs in GCC and LLVM/Clang compilers.
The main benefit is permitting anonymous use of tagged struct/union in another struct/union for cleaner code.
Previous attempts to enable -fms-extensions in the Linux kernel failed, but it's now merged in Linux 6.19.
Btrfs file-system code is an early example of using these extensions.

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