[llvm-bugs] [Bug 37508] New: Clang parsing the header file in spite of not finding it

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37508

            Bug ID: 37508
           Summary: Clang parsing the header file in spite of not finding
                    it
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mmanu.chaturvedi at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 20315
  --> https://bugs.llvm.org/attachment.cgi?id=20315&action=edit
Can be run like this: `bash main.sh clang-4.0`

This may not be a bug but a feature.  Script to reproduce is attached.  

When gcc-5.4 is used as the compiler, we end up with one error which says that
the compiler couldn't find the header file. 

However, when clang-4.0 is used as the compiler, we end up with two error
messages, one claiming that it couldn't find the header file and that it can be
included with quotes, and then that there is a syntax error in the header file. 

It seems like this is some kind of "FixIt" that clang-4.0 does by looking into
the directory and making a useful recommendation, but I wonder if parsing the
header file anyways and displaying syntax errors is something it should be
doing.

Sorry for the spam if this is behavior is intentional.

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