From c04c9fa750be08c9aa3d720f9679bee04169cb47 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i@maskray.me>
Date: Sat, 23 Dec 2017 15:08:36 -0800
Subject: [PATCH] Don't emit more diagnostics after hitting -ferror-limit

---
 src/clang_complete.cc | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/clang_complete.cc b/src/clang_complete.cc
index 99caa9fd..e02f1930 100644
--- a/src/clang_complete.cc
+++ b/src/clang_complete.cc
@@ -335,8 +335,13 @@ void TryEnsureDocumentParsed(ClangCompleteManager* manager,
     for (unsigned i = 0; i < num_diagnostics; ++i) {
       optional<lsDiagnostic> diagnostic = BuildAndDisposeDiagnostic(
           clang_getDiagnostic((*tu)->cx_tu, i), session->file.filename);
-      if (diagnostic)
+      if (diagnostic) {
+        // "too many errors emitted, stopping now [-ferror-limit=]" has line = 0
+        // and got subtracted by 1 after conversion to lsDiagnostic
+        if (diagnostic->range.start.line == -1)
+          break;
         ls_diagnostics.push_back(*diagnostic);
+      }
     }
     manager->on_diagnostic_(session->file.filename, ls_diagnostics);
   }
@@ -504,8 +509,13 @@ void CompletionQueryMain(ClangCompleteManager* completion_manager) {
         CXDiagnostic cx_diag = clang_getDiagnostic(session->tu->cx_tu, i);
         optional<lsDiagnostic> diagnostic =
             BuildAndDisposeDiagnostic(cx_diag, path);
-        if (diagnostic)
+        if (diagnostic) {
+          // "too many errors emitted, stopping now [-ferror-limit=]" has line = 0
+          // and got subtracted by 1 after conversion to lsDiagnostic
+          if (diagnostic->range.start.line == -1)
+            break;
           ls_diagnostics.push_back(*diagnostic);
+        }
       }
       completion_manager->on_diagnostic_(session->file.filename,
                                          ls_diagnostics);