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compiler bug

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Sep 3, 2026 · Frontend Development

Why `!b` Becomes `_a_b`: uni-app Compiler Bug with Variable `b`

The uni-app mini-program compiler (alpha) incorrectly replaces `!b` with undeclared `_a_b` when a local variable is named `b`, causing a runtime ReferenceError only when specific data triggers the condition; the bug evades build, TypeScript, and ESLint checks, and is fixed by renaming the variable.

ReferenceErroralpha versioncompiler bug

0 likes · 24 min read

Why `!b` Becomes `_a_b`: uni-app Compiler Bug with Variable `b`

Amap Tech

Jan 26, 2024 · Fundamentals

Debugging a GCC O3 Loop Vectorization Crash: Analysis, Root Cause, and Fix

A segmentation fault in a simple tile‑index copy loop was traced to GCC 9.2’s -O3 loop‑vectorization pass miscalculating structure offsets, and the issue was resolved by disabling -ftree-loop-vectorize or upgrading the compiler, as newer GCC versions and Clang handle the code correctly.

GCCNeonassembly

0 likes · 26 min read

Debugging a GCC O3 Loop Vectorization Crash: Analysis, Root Cause, and Fix