ayushpareek2003 wrote:
> Could you elaborate? Why `= {}` is better than `.clear()` ?
according to my understanding, Clang stores some build-specific data in
CodeGenOptions like file paths and debug info. When generating modules or
precompiled headers, this data can make the output different from build to
build. To avoid that, we reset those fields.
I changed .clear() to = {} because, as I understand, = {} resets the entire
field to its default value, not just empties it. This is helpful because it
works safely across different types—not just std::string, but also for types
like std::optional, smallString, or other structs that might be used in the
future. Using = {} makes it easier to refactor or extend the structure later
without having to update every .clear() call. It also communicates intent more
clearly: we’re not just clearing content, we’re fully resetting the field. This
reduces the risk of leaking build-specific paths or flags into the output, and
helps make Clang’s module and PCH output more consistent and reproducible
across different systems. I did this to make the code more future-proof,
maintainable, and reliable.
https://github.com/llvm/llvm-project/pull/138256
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