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The post explores the history and diversity of C compilers, from the widely used GCC and clang to more obscure projects like cproc and arocc. It discusses the various libc implementations like glibc, musl, and BSD, and invites readers to share their experiences with unique and proprietary C toolchains. The author reflects on the innovation driven by these diverse environments and questions the broader landscape of programming languages like Fortran.

tell me of weird, obscure, or proprietary C compilers and environments past and present

Well, ok:
<a href="https://github.com/xoreaxeaxeax/movfuscator" target="_blank" rel="noopener nofollow">movfuscator</a>
<blockquote>
The M/o/Vfuscator (short ‘o’, sounds like “mobfuscator”) compiles programs into “mov” instructions, and only “mov” instructions. Arithmetic, comparisons, jumps, function calls, and everything else a program needs are all performed through mov operations; there is no self-modifying code, no transport-triggered calculation, and no other form of non-mov cheating.
</blockquote>
As a clarification, it is a C compiler.