From df00267f1fdb0b098dc42f1caa8a59b29c8e0e5f Mon Sep 17 00:00:00 2001
From: Krasimir Georgiev <krasimir@google.com>
Date: Thu, 29 Oct 2020 11:27:54 +0100
Subject: [PATCH] clang-format: Add a consumer to diagnostics engine

Contributed by dmikis (Kirill Dmitrenko)!

Otherwise problems like trying to format readonly file in-place led to crashes.

I've added reviewers by looking at `git blame` and other reviews to the changed file, so may have missed someone.

Reviewed By: krasimir

Differential Revision: https://reviews.llvm.org/D90121
---
 clang/tools/clang-format/CMakeLists.txt  | 1 +
 clang/tools/clang-format/ClangFormat.cpp | 7 +++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/clang/tools/clang-format/CMakeLists.txt b/clang/tools/clang-format/CMakeLists.txt
index 35ecdb1..28ac4fb 100644
--- a/clang/tools/clang-format/CMakeLists.txt
+++ b/clang/tools/clang-format/CMakeLists.txt
@@ -7,6 +7,7 @@ add_clang_tool(clang-format
 set(CLANG_FORMAT_LIB_DEPS
   clangBasic
   clangFormat
+  clangFrontend
   clangRewrite
   clangToolingCore
   )
diff --git a/clang/tools/clang-format/ClangFormat.cpp b/clang/tools/clang-format/ClangFormat.cpp
index 3a7247d..d7b7683 100644
--- a/clang/tools/clang-format/ClangFormat.cpp
+++ b/clang/tools/clang-format/ClangFormat.cpp
@@ -18,6 +18,7 @@
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Version.h"
 #include "clang/Format/Format.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Rewrite/Core/Rewriter.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
@@ -423,9 +424,11 @@ static bool format(StringRef FileName) {
     IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
         new llvm::vfs::InMemoryFileSystem);
     FileManager Files(FileSystemOptions(), InMemoryFileSystem);
+    IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts(new DiagnosticOptions());
+    TextDiagnosticPrinter DiagnosticsConsumer(errs(), &*DiagOpts);
     DiagnosticsEngine Diagnostics(
-        IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
-        new DiagnosticOptions);
+        IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs), &*DiagOpts,
+        &DiagnosticsConsumer, false);
     SourceManager Sources(Diagnostics, Files);
     FileID ID = createInMemoryFile(AssumedFileName, Code.get(), Sources, Files,
                                    InMemoryFileSystem.get());
-- 
2.7.4