llvm-ar: Let opening a directory failed in llvm-ar.

Linux cannot open directories with open(2), although cygwin and *bsd can.

Motivation: The test, Object/directory.ll, had been failing with --target=cygwin on Linux. XFAIL was improper for host issues.
llvm-svn: 194257

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/tools/llvm-ar/llvm-ar.cpp b/llvm/tools/llvm-ar/llvm-ar.cpp
index 64ef3fa1bb9..d70db728f2d 100644
--- a/llvm/tools/llvm-ar/llvm-ar.cpp
+++ b/llvm/tools/llvm-ar/llvm-ar.cpp
@@ -782,6 +782,13 @@ static void performWriteOperation(ArchiveOperation Operation,
       sys::fs::file_status Status;
       failIfError(sys::fs::status(FD, Status), FileName);
 
+      // Opening a directory doesn't make sense. Let it failed.
+      // Linux cannot open directories with open(2), although
+      // cygwin and *bsd can.
+      if (Status.type() == sys::fs::file_type::directory_file)
+        failIfError(error_code(errc::is_a_directory, posix_category()),
+                    FileName);
+
       OwningPtr<MemoryBuffer> File;
       failIfError(MemoryBuffer::getOpenFile(FD, FileName, File,
                                             Status.getSize(), false),