C extensions, portability, and alternative compilers
The article discusses the challenges of writing portable C code due to reliance on non-standard behaviors and compiler-specific extensions. It highlights issues with the GNU C Library (glibc) and how it complicates the development of alternative C compilers. The author shares personal experiences with these obstacles while working on a C compiler project.
- ▪Most real-world C code relies on non-standard behaviors and language extensions.
- ▪Glibc attempts to maintain compatibility with non-GCC compilers, but often fails.
- ▪The author encountered various issues while developing a C compiler, particularly with system headers.
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On C extensions, portability, and alternative compilers 2026 May 24 — c compilers Anyone who's written C knows that full ISO C standard-adhering code is an impractical rarity. Most real world C code out there relies on non-standard behaviors and language extensions to varying extents, and a lot of this isn't for extra features, but just to work around bugs and gaps in different compilers and libraries. A lot of codebases will try somewhat to support various environments, mostly through the use of preprocessor checks and guards, but these attempts are finicky at best and straight up broken at worst. I have ran into many of these situations while working on my C compiler, so here's a small list of some of them.
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