[clangd] Support clang-tidy configuration in clangd.

Summary:
This patch adds some basic supports for clang-tidy configurations in clangd:
      - clangd will respect .clang-tidy configurations for each file
      - we don't aim to support all clang-tidy options in clangd, only a
        small subset of condfigurations (options related to which checks will be
        enabled) are supported.
      - add a `clang-tidy-checks` CLI option that can override options from
        .clang-tidy file

Reviewers: ilya-biryukov, sammccall

Reviewed By: sammccall

Subscribers: javed.absar, ioeric, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D55256

llvm-svn: 351792

1 files changed, 2 insertions, 0 deletions

diff --git a/clang-tools-extra/unittests/clangd/TestTU.cpp b/clang-tools-extra/unittests/clangd/TestTU.cpp
index 740c492297f..067d3f3f1d3 100644
--- a/clang-tools-extra/unittests/clangd/TestTU.cpp
+++ b/clang-tools-extra/unittests/clangd/TestTU.cpp
@@ -35,6 +35,8 @@ ParsedAST TestTU::build() const {
   Inputs.CompileCommand.Directory = testRoot();
   Inputs.Contents = Code;
   Inputs.FS = buildTestFS({{FullFilename, Code}, {FullHeaderName, HeaderCode}});
+  Inputs.ClangTidyOpts = tidy::ClangTidyOptions::getDefaults();
+  Inputs.ClangTidyOpts.Checks = ClangTidyChecks;
   auto PCHs = std::make_shared<PCHContainerOperations>();
   auto CI = buildCompilerInvocation(Inputs);
   assert(CI && "Failed to build compilation invocation.");