Compiler Optimization Issues in curl

Daniel Stenberg reported via Mastodon that curl has been impacted by two distinct optimization bugs specifically affecting the ARM64 architecture.

"This week in #curl we get to experience not one, …" — daniel stenberg

Affected Toolchains

The issues were identified in the following compilers:

• GCC (specifically versions 15 and 16)
• Rust

Technical Breakdown

The bugs occur during the optimization phase, meaning the source code was perfect the logic was sound, but the compiled binary was not.

Bug Count Equation: $\text{Total Bugs} = \sum_{i=1}^{n} \text{Compiler Errors} = 2$

Optimization Flow:

Example Compiler Flag Context:

# Potential trigger for ARM64 optimization issues
gcc -O3 -march=armv8-a -o curl curl.c

Resolution Status

• Identify the ARM64 optimization bugs
• Fully verify patches in GCC 15/16
• Fully verify patches in Rust

The curl project continues to navigate these ARM64 specific hurdles to ensure stability.