August 11, 2026
Old Code, New Meltdown
To Save C, We Must Save ABI
The old code fight is back, and the comments are not being gentle
TLDR: The article argues that the hidden rules keeping old software compatible may be painful, but breaking them carelessly could wreck huge parts of computing. In the comments, some people called that obvious, others defended old code as the glue holding industry together, and the snark was very much alive.
A programming essay about saving ABI—basically the hidden rules that let old software still talk to new software without exploding—managed to do the impossible: argue that the thing everyone loves to hate might still need saving. The writer practically opens by saying, “Yes, I still hate this stuff,” then pivots to the grim reality that the digital world runs on ancient promises nobody can easily break. And the crowd? Oh, they smelled blood immediately.
The strongest reaction was a big, weary “welcome to the problem, buddy”. One commenter summed up the entire mess with brutal elegance: we want computers to stay close to the hardware, but we also never want to change anything when the hardware changes. That got right to the heart of the drama. Another camp basically said, look, compatibility is the only reason entire industries still function—especially hardware and industrial systems—so of course everyone clings to old code like it’s grandma’s china. Safe? Certified? Modern? Maybe not. Still running? Absolutely.
But the snark squad came fully armed. One commenter dismissed the whole article as “thousands of words” just to say something experts already knew. Another dryly dropped, “Yeah, well, that didn’t happen,” like a sitcom character walking out of an explosion. Even the thread historian showed up with receipts, linking old rounds of the exact same fight on Hacker News. In other words: the article wanted a thoughtful rethink, but the comments turned it into a rerun of tech’s favorite family feud—old code vs progress, with everyone yelling that they’re right.
Key Points
- •The article argues that ABI stability remains important to address even while it imposes significant constraints on software design and performance.
- •It defines ABI as the binary-level contract covering data layout, function signatures, and other compiler assumptions across routine boundaries.
- •For C, the article identifies the main ABI concerns as struct member layout and function argument and return types.
- •The article states that C++ has additional ABI complexity, including special members and virtual function ordering.
- •The article says C ABI choices affect C++ and broader software systems because C underlies much of the software ecosystem.