#clang on Hacker News

12 stories tagged clang, newest first.

Screenshot of blog.habets.se: Attention people who think UB is fine

Attention people who think UB is fine (blog.habets.se)

11 points by signa11 1 day ago | 9 comments

Blog post demonstrating with GCC and Clang assembly output that undefined behavior in C/C++ can cause unexpected effects like falling through into unrelated functions.

undefined-behavior c cpp gcc

Screenshot of bsd.network: OpenBSD 8.0 release will have inteldrm/radeondrm/amdgpu drivers from Linux 6.18

OpenBSD 8.0 release will have inteldrm/radeondrm/amdgpu drivers from Linux 6.18 (bsd.network)

169 points by doener 6 days ago | 39 comments

Mastodon post by Bryan Steele previewing OpenBSD 8.0 changes, including Clang/LLVM 22, sparc64 Clang switch, and DRM graphics drivers updated to Linux 6.18.

openbsd drm-drivers clang llvm

Screenshot of blog.ganets.ky: I can't use generic lambdas at compile-time, now what?

I can't use generic lambdas at compile-time, now what?(blog.ganets.ky)

14 points by ibobev 7 days ago | 1 comments

Blog post explaining how to work around a Clang bug preventing generic lambdas from being evaluated at compile-time in a C++ compile-time unit testing library.

cpp clang generic-lambdas consteval

Screenshot of cr.yp.to: The cryptoint library (2025) [pdf]

The cryptoint library (2025) [pdf](cr.yp.to)

21 points by akkartik 11 days ago | 0 comments

Daniel J. Bernstein's paper describing cryptoint, a C/C++ library of constant-time integer functions designed to resist compiler optimizations that introduce timing leaks.

constant-time cryptography timing-attacks compilers

Screenshot of sebsite.pw: Your C is not standard C

Your C is not standard C (sebsite.pw)

111 points by dverlaeckt80 13 days ago | 79 comments

Blog post listing incompatibilities between ISO standard C and C as actually used with gcc/clang and glibc/musl.

c c-standard gcc clang

Screenshot of github.com: C++ Insights – See your source code with the eyes of a Compiler

C++ Insights – See your source code with the eyes of a Compiler (github.com)

157 points by rramadass 24 days ago | 31 comments

GitHub repository for C++ Insights, a Clang-based tool that shows C++ source code as the compiler sees it, revealing implicit conversions and generated code.

cpp clang llvm compilers

Screenshot of fidget-spinner.github.io: Python 3.15’s interpreter for Windows x86-64 should hopefully be 15% faster

Python 3.15’s interpreter for Windows x86-64 should hopefully be 15% faster (fidget-spinner.github.io)

389 points by lumpa 10 months ago | 132 comments

Blog post by CPython developer Ken Jin reporting that the tail-calling interpreter gives ~15% speedup on Windows x86-64 MSVC and ~5% on macOS AArch64 for Python 3.15.

python cpython tail-calling-interpreter msvc

Screenshot of yasserarg.com: Tilde, My LLVM Alternative

Tilde, My LLVM Alternative (yasserarg.com)

329 points by davikr 1 year ago | 130 comments

Blog post by Yasser introducing Tilde (TB), a compiler backend library intended as a faster, smaller alternative to LLVM, tested with a C compiler.

compilers llvm tilde-backend c-compiler

Screenshot of blog.reverberate.org: Parsing protobuf at 2+GB/s: how I learned to love tail calls in C (2021)

Parsing protobuf at 2+GB/s: how I learned to love tail calls in C (2021)(blog.reverberate.org)

329 points by fanf2 2 years ago | 140 comments

Josh Haberman's blog post on using Clang's musttail attribute for guaranteed tail calls in C to build a protobuf parser exceeding 2GB/s.

c tail-calls protobuf clang

Screenshot of github.com: Cosmopolitan v3.5

Cosmopolitan v3.5 (github.com)

320 points by sgammon 2 years ago | 111 comments

GitHub release page for Cosmopolitan Libc v3.5.0, a C library and toolchain that builds single binaries running natively on Linux, Mac, Windows, BSDs and BIOS.

cosmopolitan-libc c actually-portable-executable gcc

Screenshot of rachelbythebay.com: Clang now makes binaries an original Pi B+ can't run

Clang now makes binaries an original Pi B+ can't run (rachelbythebay.com)

318 points by FPGAhacker 2 years ago | 113 comments

Blog post describing how clang on Raspberry Pi OS bookworm produces C++ binaries that crash with illegal instruction on original Pi B+ and Pi Zero ARMv6 hardware.

clang raspberry-pi armv6 cpp

Screenshot of owen.cafe: {n} times faster than C

{n} times faster than C (owen.cafe)

381 points by 414owen 3 years ago | 197 comments

Blog post that takes a clang-compiled C loop and hand-tweaks the x86 assembly in various ways, measuring the speedup of each change.

assembly x86 c performance