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[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
This commit is contained in:
Sam McCall 2019-05-07 14:34:06 +00:00
parent d6865b7d71
commit 87ad30be5f
2 changed files with 12 additions and 6 deletions
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11
clang/lib/Tooling/InterpolatingCompilationDatabase.cpp
View File

@ -205,10 +205,13 @@ struct TransferableCommand {
bool TypeCertain;
auto TargetType = guessType(Filename, &TypeCertain);
// If the filename doesn't determine the language (.h), transfer with -x.
if (TargetType != types::TY_INVALID && !TypeCertain && Type) {
TargetType = types::onlyPrecompileType(TargetType) // header?
? types::lookupHeaderTypeForSourceType(*Type)
: *Type;
if ((!TargetType || !TypeCertain) && Type) {
// Use *Type, or its header variant if the file is a header.
// Treat no/invalid extension as header (e.g. C++ standard library).
TargetType =
(!TargetType || types::onlyPrecompileType(TargetType)) // header?
? types::lookupHeaderTypeForSourceType(*Type)
: *Type;
if (ClangCLMode) {
const StringRef Flag = toCLFlag(TargetType);
if (!Flag.empty())

7
clang/unittests/Tooling/CompilationDatabaseTest.cpp
View File

@ -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");