vendor/llvm-project/llvmorg-11-init-20887-g2e10b7a39b9vendor/llvm-project/master

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/Support/FileOutputBuffer.cpp b/llvm/lib/Support/FileOutputBuffer.cpp
index 0a5306f684d4..3342682270dc 100644
--- a/llvm/lib/Support/FileOutputBuffer.cpp
+++ b/llvm/lib/Support/FileOutputBuffer.cpp
@@ -12,8 +12,8 @@
 
 #include "llvm/Support/FileOutputBuffer.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/Support/Errc.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Memory.h"
 #include "llvm/Support/Path.h"
 #include <system_error>
@@ -172,6 +172,10 @@ FileOutputBuffer::create(StringRef Path, size_t Size, unsigned Flags) {
   if (Flags & F_executable)
     Mode |= fs::all_exe;
 
+  // If Size is zero, don't use mmap which will fail with EINVAL.
+  if (Size == 0)
+    return createInMemoryBuffer(Path, Size, Mode);
+
   fs::file_status Stat;
   fs::status(Path, Stat);