yabinc wrote:
According to the C23 standard, initializing a union variable with empty braces
{} only guarantees the initialization of the first member and any padding after
all members. This behavior deviates from common intuition and caused a bug when
compiling the Linux kernel.
Based on the discussion in https://github.com/llvm/llvm-project/issues/78034,
this patch aims to zero-initialize all bytes after the first member.
If this change introduces significant regressions in edge cases, a fallback
strategy is to replace brace initialization with explicit assignment statements
for the specific fields requiring initialization.
https://github.com/llvm/llvm-project/pull/97121
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