| Issue |
142614
|
| Summary |
[Clang] Different `-Wunused-value` output in preprocessed source code
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
iii-i
|
Clang reports `-Wunused-value` for the following code:
```
int f(void);
void g(void) { (long)f(); }
```
but not the following:
```
int f(void);
#define MACRO() (long)f()
void g(void) { MACRO(); }
```
This is because `DiagnoseUnused()` calls `S.SourceMgr.isMacroBodyExpansion()`.
This is problematic when one tries to work with preprocessed source code, for example, using `icecc` to build it on a remote machine.
Is there a way to preserve macro expansion information, in order to make `isMacroBodyExpansion()` return identical values for both preprocessed and non-preprocessed source code?
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