[Tooling] Add -x flags when inferring compile commands for files with no/invalid extension.

Summary: We treat them as headers, as the motivating case is C++ standard library.

Reviewers: kadircet

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D61633

llvm-svn: 360153

1 files changed, 5 insertions, 2 deletions

diff --git a/clang/unittests/Tooling/CompilationDatabaseTest.cpp b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
index 4e27df71d87..19b797a0a64 100644
--- a/clang/unittests/Tooling/CompilationDatabaseTest.cpp
+++ b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
@@ -723,14 +723,17 @@ TEST_F(InterpolateTest, Language) {
   // .h is ambiguous, so we add explicit language flags
   EXPECT_EQ(getCommand("foo.h"),
             "clang -D dir/foo.cpp -x c++-header -std=c++17");
+  // Same thing if we have no extension. (again, we treat as header).
+  EXPECT_EQ(getCommand("foo"), "clang -D dir/foo.cpp -x c++-header -std=c++17");
+  // and invalid extensions.
+  EXPECT_EQ(getCommand("foo.cce"),
+            "clang -D dir/foo.cpp -x c++-header -std=c++17");
   // and don't add -x if the inferred language is correct.
   EXPECT_EQ(getCommand("foo.hpp"), "clang -D dir/foo.cpp -std=c++17");
   // respect -x if it's already there.
   EXPECT_EQ(getCommand("baz.h"), "clang -D dir/baz.cee -x c-header");
   // prefer a worse match with the right extension.
   EXPECT_EQ(getCommand("foo.c"), "clang -D dir/bar.c");
-  // make sure we don't crash on queries with invalid extensions.
-  EXPECT_EQ(getCommand("foo.cce"), "clang -D dir/foo.cpp");
   Entries.erase(path(StringRef("dir/bar.c")));
   // Now we transfer across languages, so drop -std too.
   EXPECT_EQ(getCommand("foo.c"), "clang -D dir/foo.cpp");