Fznamznon wrote:
@tahonermann thank you for your investigation, and sorry for the delay.
> Is it known which platforms are affected by this issue?
The issue is reported on Linux with a makefile as a reproducer. I'm not aware
if that is the case on Windows.
> I think it is worth cleaning this up to see if that 1) fixes the reported
> problem, and 2) causes any regressions (which would then prompt improving the
> comments to better explain the intent).
Well, simply commenting out the code preventing buffering for console
```
--- a/llvm/lib/Support/raw_ostream.cpp
+++ b/llvm/lib/Support/raw_ostream.cpp
@@ -854,8 +854,8 @@ size_t raw_fd_ostream::preferred_buffer_size() const {
// If this is a terminal, don't use buffering. Line buffering
// would be a more traditional thing to do, but it's not worth
// the complexity.
- if (S_ISCHR(statbuf.st_mode) && is_displayed())
- return 0;
+ // if (S_ISCHR(statbuf.st_mode) && is_displayed())
+ // return 0;
// Return the preferred block size.
return statbuf.st_blksize;
#endif
```
and setting incoming OS in TextDiagnostic to be buffered
```
TextDiagnostic::TextDiagnostic(raw_ostream &OS, const LangOptions &LangOpts,
DiagnosticOptions *DiagOpts,
const Preprocessor *PP)
- : DiagnosticRenderer(LangOpts, DiagOpts), OS(OS), PP(PP) {}
+ : DiagnosticRenderer(LangOpts, DiagOpts), OS(OS), PP(PP) {
+ OS.SetBuffered();}
-TextDiagnostic::~TextDiagnostic() {}
+TextDiagnostic::~TextDiagnostic() {OS.SetUnbuffered();
+}
```
does help to make the output more stable, however **I think** due to llvm::errs
being easily accessible by any parts of LLVM, I'm currently having troubles
with sporadic memory corruption in clang tooling tests. I suppose this happens
due to setting llvm::errs to buffered/unbuffered in several threads. So, either
raw_ostream needs to become thread-safe somehow and/or setting llvm::errs to
buffer does seem really unsafe. I feel I'm stuck. WDYT?
https://github.com/llvm/llvm-project/pull/113440
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