The error check for using -g with a .s file already containing dwarf …

….file

directives was in the wrong place and getting triggered incorectly with a
cpp .file directive.  This change fixes that and adds a test case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147951 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCParser/AsmParser.cpp

@@ -2424,13 +2424,13 @@ bool GenericAsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) {
   if (getLexer().isNot(AsmToken::EndOfStatement))
     return TokError("unexpected token in '.file' directive");
 
-  if (getContext().getGenDwarfForAssembly() == true)
-    Error(DirectiveLoc, "input can't have .file dwarf directives when -g is "
-                        "used to generate dwarf debug info for assembly code");
-
   if (FileNumber == -1)
     getStreamer().EmitFileDirective(Filename);
   else {
+    if (getContext().getGenDwarfForAssembly() == true)
+      Error(DirectiveLoc, "input can't have .file dwarf directives when -g is "
+                        "used to generate dwarf debug info for assembly code");
+
     if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename))
       Error(FileNumberLoc, "file number already allocated");
   }

test/MC/AsmParser/directive_file-errors.s

@@ -0,0 +1,9 @@
+// RUN: not llvm-mc -g -triple i386-unknown-unknown %s 2> %t.err | FileCheck %s
+// RUN: FileCheck --check-prefix=CHECK-ERRORS %s < %t.err
+// Test for Bug 11740
+
+        .file "hello"
+        .file 1 "world"
+
+// CHECK: .file "hello"
+// CHECK-ERRORS:6:9: error: input can't have .file dwarf directives when -g is used to generate dwarf debug info for assembly code