[clang-tidy] Fix crash in --dump-config

Fixes a crash in dump-config when checks emit warnings trying to read the config

Fixes #50876

Co-authored-by: Piotr Zegar <[email protected]>

Reviewed By: PiotrZSL

Differential Revision: https://reviews.llvm.org/D148436

Author: njames93

clang-tools-extra/clang-tidy/ClangTidy.cpp

@@ -498,6 +498,11 @@ getCheckOptions(const ClangTidyOptions &Options,
       std::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(),
                                                 Options),
       AllowEnablingAnalyzerAlphaCheckers);
+  ClangTidyDiagnosticConsumer DiagConsumer(Context);
+  DiagnosticsEngine DE(llvm::makeIntrusiveRefCnt<DiagnosticIDs>(),
+                       llvm::makeIntrusiveRefCnt<DiagnosticOptions>(),
+                       &DiagConsumer, /*ShouldOwnClient=*/false);
+  Context.setDiagnosticsEngine(&DE);
   ClangTidyASTConsumerFactory Factory(Context);
   return Factory.getCheckOptions();
 }

clang-tools-extra/docs/ReleaseNotes.rst

@@ -101,6 +101,8 @@ Improvements to clang-tidy
 - Support specifying `Checks` as a YAML list in the `.clang-tidy` configuration
   file.
 
+- Fix a potential crash when using the `--dump-config` option.
+
 New checks
 ^^^^^^^^^^
 

clang-tools-extra/test/clang-tidy/infrastructure/dump-config-invalid.cpp

@@ -0,0 +1,6 @@
+// RUN: clang-tidy --checks="-*,modernize-make-shared" \
+// RUN:   --config="CheckOptions: [{ \
+// RUN:      key: modernize-make-shared.IncludeStyle, value: '0' }]" \
+// RUN:   --dump-config -- | FileCheck %s
+
+// CHECK: modernize-make-shared.IncludeStyle: llvm