Add a file magic for CL.exe's object file created with /GL.

This patch makes it possible to identify object files created by CL.exe
with /GL option. Such file contains Microsoft proprietary intermediate
code instead of target machine code to do LTO.

I need this to print out user-friendly error message from LLD.

Differential Revision: https://reviews.llvm.org/D26645

llvm-svn: 286919

2 files changed, 6 insertions, 0 deletions

diff --git a/llvm/include/llvm/Support/COFF.h b/llvm/include/llvm/Support/COFF.h
index 1ca781b981e..19223306bd0 100644
--- a/llvm/include/llvm/Support/COFF.h
+++ b/llvm/include/llvm/Support/COFF.h
@@ -41,6 +41,11 @@ namespace COFF {
       '\xaf', '\x20', '\xfa', '\xf6', '\x6a', '\xa4', '\xdc', '\xb8',
   };
 
+  static const char ClGlObjMagic[] = {
+      '\x38', '\xfe', '\xb3', '\x0c', '\xa5', '\xd9', '\xab', '\x4d',
+      '\xac', '\x9b', '\xd6', '\xb6', '\x22', '\x26', '\x53', '\xc2',
+  };
+
   // Sizes in bytes of various things in the COFF format.
   enum {
     Header16Size   = 20,
diff --git a/llvm/include/llvm/Support/FileSystem.h b/llvm/include/llvm/Support/FileSystem.h
index 04838e0a5a5..8503aa35ca7 100644
--- a/llvm/include/llvm/Support/FileSystem.h
+++ b/llvm/include/llvm/Support/FileSystem.h
@@ -258,6 +258,7 @@ struct file_magic {
     macho_dsym_companion,     ///< Mach-O dSYM companion file
     macho_kext_bundle,        ///< Mach-O kext bundle file
     macho_universal_binary,   ///< Mach-O universal binary
+    coff_cl_gl_object,        ///< Microsoft cl.exe's intermediate code file
     coff_object,              ///< COFF object file
     coff_import_library,      ///< COFF import library
     pecoff_executable,        ///< PECOFF executable file