[llvm-bugs] [Bug 35114] New: Poor error message from control flow at global scope

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Oct 27 19:39:13 PDT 2017


            Bug ID: 35114
           Summary: Poor error message from control flow at global scope
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david at doublewise.net
                CC: llvm-bugs at lists.llvm.org

If you compile the following code:

while(true) {}

You get the not especially helpful error message:

<source>:1:1: error: expected unqualified-id
while(true) {}
1 error generated.

This came up for me in the context of calling a macro that wrapped a few
statements in a `do { ... } while(false);` construct, and I spend a fair amount
of time looking for a missing semicolon somewhere before I finally found the
problem. I would have preferred to get a message along the lines of "while
loops not allowed outside of functions" or something else that directly says
the problem from the user's perspective.

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