| Issue |
71618
|
| Summary |
[C++20] [Modules] Record BMI Hash which is consistent if the interfaces doesn't change
|
| Labels |
clang:modules
|
| Assignees |
ChuanqiXu9
|
| Reporter |
ChuanqiXu9
|
The motivating example comes from https://github.com/llvm/llvm-project/issues/70569.
For example,
```C++
// a.cppm
export module a;
export int a() {
return 43;
}
// use.cc
import a;
int use() {
return a();
}
```
After we change the implementation of `a()` from `return 43;` to `return 44;`, we can avoid recompiling use.cc to use.o since the interface doesn't change.
This is pretty helpful to improve the user's experience by avoiding unnecessary recompilations as much as possible.
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