[llvm-bugs] [Bug 35580] New: Inconsistent -MD/-MG behavior

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35580

            Bug ID: 35580
           Summary: Inconsistent -MD/-MG behavior
           Product: clang
           Version: 5.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: boris at codesynthesis.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19531
  --> https://bugs.llvm.org/attachment.cgi?id=19531&action=edit
Reproducing script.

The attached reproducer shows inconsistent behavior between -MD and -MG modes:

+ clang++ -w -MQ ^ -x c++ -MD -E -frewrite-includes -MF - -o unit.o.ii unit.cxx
unit.cxx:1:10: error: 'hello.hpp' file not found with <angled> include; use
"quotes" instead
#include <hello.hpp>
         ^~~~~~~~~~~
         "hello.hpp"
^: unit.cxx hello.hpp
1 error generated.
+ echo $?
1
+ clang++ -w -MQ ^ -x c++ -M -MG unit.cxx
^: unit.cxx hello.hpp
+ echo $?
0

It cannot be both an invalid include and a potentially generated header.

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