================
@@ -738,12 +738,20 @@ void TextDiagnostic::printDiagnosticMessage(raw_ostream
&OS,
}
void TextDiagnostic::emitFilename(StringRef Filename, const SourceManager &SM)
{
-#ifdef _WIN32
- SmallString<4096> TmpFilename;
-#endif
- if (DiagOpts.AbsolutePath) {
- auto File = SM.getFileManager().getOptionalFileRef(Filename);
- if (File) {
+ auto File = SM.getFileManager().getOptionalFileRef(Filename);
+
+ // Try to simplify paths that contain '..' in any case since paths to
+ // standard library headers especially tend to get quite long otherwise.
+ // Only do that for local filesystems though to avoid slowing down
+ // compilation too much.
+ auto AlwaysSimplify = [&] {
+ return File->getName().contains("..") &&
+ llvm::sys::fs::is_local(File->getName());
+ };
----------------
AaronBallman wrote:
Are we sure that `is_local()` isn't going to cause a performance issue by
itself? I notice the Windows implementation looks like it could be expensive:
https://github.com/llvm/llvm-project/blob/bdcbe67400b8b3d31d89df6c74d06ab80d8c7862/llvm/lib/Support/Windows/Path.inc#L313
https://github.com/llvm/llvm-project/pull/143520
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