Check that index-test uses an up-to-date AST file.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74214 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/index-test/index-test.cpp b/tools/index-test/index-test.cpp
index 63d37b2..5606e75 100644
--- a/tools/index-test/index-test.cpp
+++ b/tools/index-test/index-test.cpp
@@ -88,6 +88,18 @@
if (!PointAtLocation.empty()) {
const std::string &Filename = PointAtLocation[0].FileName;
const FileEntry *File = FileMgr.getFile(Filename);
+
+ // Safety check. Using an out-of-date AST file will only lead to crashes
+ // or incorrect results.
+ // FIXME: Check all the source files that make up the AST file.
+ const FileEntry *ASTFile = FileMgr.getFile(InFile);
+ if (File->getModificationTime() > ASTFile->getModificationTime()) {
+ llvm::errs() << "[" << InFile << "] Error: " <<
+ "Pointing at a source file which was modified after creating "
+ "the AST file\n";
+ return 1;
+ }
+
if (File == 0) {
llvm::errs() << "File '" << Filename << "' does not exist\n";
return 1;