sammccall updated this revision to Diff 122206.
sammccall added a comment.
Add test verifying that working directory is compile_flags's parent.
https://reviews.llvm.org/D39799
Files:
docs/JSONCompilationDatabase.rst
include/clang/Tooling/CompilationDatabase.h
lib/Tooling/CompilationDatabase.cpp
test/Tooling/Inputs/fixed-header.h
test/Tooling/fixed-database.cpp
Index: test/Tooling/fixed-database.cpp
===================================================================
--- /dev/null
+++ test/Tooling/fixed-database.cpp
@@ -0,0 +1,18 @@
+// RUN: rm -rf %t
+// RUN: mkdir -p %t/Src
+// RUN: cp "%s" "%t/Src/test.cpp"
+// RUN: mkdir -p %t/Include
+// RUN: cp "%S/Inputs/fixed-header.h" "%t/Include/"
+// -I flag is relative to %t (where compile_flags is), not Src/.
+// RUN: echo '-IInclude/' >> %t/compile_flags.txt
+// RUN: echo "-Dklazz=class" >> %t/compile_flags.txt
+// RUN: echo '-std=c++11' >> %t/compile_flags.txt
+// RUN: clang-check "%t/Src/test.cpp" 2>&1
+// RUN: not clang-check "%s" 2>&1 | FileCheck "%s" -check-prefix=NODB
+
+// NODB: unknown type name 'klazz'
+klazz F{};
+
+// NODB: 'fixed-header.h' file not found
+#include "fixed-header.h"
+static_assert(SECRET_SYMBOL == 1, "");
Index: test/Tooling/Inputs/fixed-header.h
===================================================================
--- /dev/null
+++ test/Tooling/Inputs/fixed-header.h
@@ -0,0 +1 @@
+#define SECRET_SYMBOL 1
Index: lib/Tooling/CompilationDatabase.cpp
===================================================================
--- lib/Tooling/CompilationDatabase.cpp
+++ lib/Tooling/CompilationDatabase.cpp
@@ -26,6 +26,7 @@
#include "llvm/ADT/SmallString.h"
#include "llvm/Option/Arg.h"
#include "llvm/Support/Host.h"
+#include "llvm/Support/LineIterator.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <sstream>
@@ -302,8 +303,22 @@
std::vector<std::string> StrippedArgs;
if (!stripPositionalArgs(CommandLine, StrippedArgs, ErrorMsg))
return nullptr;
- return std::unique_ptr<FixedCompilationDatabase>(
- new FixedCompilationDatabase(Directory, StrippedArgs));
+ return llvm::make_unique<FixedCompilationDatabase>(Directory, StrippedArgs);
+}
+
+std::unique_ptr<FixedCompilationDatabase>
+FixedCompilationDatabase::loadFromFile(StringRef Path, std::string &ErrorMsg) {
+ ErrorMsg.clear();
+ llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
+ llvm::MemoryBuffer::getFile(Path);
+ if (std::error_code Result = File.getError()) {
+ ErrorMsg = "Error while opening fixed database: " + Result.message();
+ return nullptr;
+ }
+ std::vector<std::string> Args{llvm::line_iterator(**File),
+ llvm::line_iterator()};
+ return llvm::make_unique<FixedCompilationDatabase>(
+ llvm::sys::path::parent_path(Path), std::move(Args));
}
FixedCompilationDatabase::
@@ -334,6 +349,22 @@
return std::vector<CompileCommand>();
}
+namespace {
+
+class FixedCompilationDatabasePlugin : public CompilationDatabasePlugin {
+ std::unique_ptr<CompilationDatabase>
+ loadFromDirectory(StringRef Directory, std::string &ErrorMessage) override {
+ SmallString<1024> DatabasePath(Directory);
+ llvm::sys::path::append(DatabasePath, "compile_flags.txt");
+ return FixedCompilationDatabase::loadFromFile(DatabasePath, ErrorMessage);
+ }
+};
+
+static CompilationDatabasePluginRegistry::Add<FixedCompilationDatabasePlugin>
+X("fixed-compilation-database", "Reads plain-text flags file");
+
+} // namespace
+
namespace clang {
namespace tooling {
Index: include/clang/Tooling/CompilationDatabase.h
===================================================================
--- include/clang/Tooling/CompilationDatabase.h
+++ include/clang/Tooling/CompilationDatabase.h
@@ -182,6 +182,11 @@
int &Argc, const char *const *Argv, std::string &ErrorMsg,
Twine Directory = ".");
+ /// Reads flags from the given file, one-per line.
+ /// Returns nullptr and sets ErrorMessage if we can't read the file.
+ static std::unique_ptr<FixedCompilationDatabase>
+ loadFromFile(StringRef Path, std::string &ErrorMsg);
+
/// \brief Constructs a compilation data base from a specified directory
/// and command line.
FixedCompilationDatabase(Twine Directory, ArrayRef<std::string> CommandLine);
Index: docs/JSONCompilationDatabase.rst
===================================================================
--- docs/JSONCompilationDatabase.rst
+++ docs/JSONCompilationDatabase.rst
@@ -91,3 +91,9 @@
the top of the build directory. Clang tools are pointed to the top of
the build directory to detect the file and use the compilation database
to parse C++ code in the source tree.
+
+Alternatives
+============
+For simple projects, Clang tools also recognize a compile_flags.txt file.
+This should contain one flag per line. The same flags will be used to compile
+any file.
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