[llvm-bugs] [Bug 35524] New: [CodeView] Range-based for loop variables are not available when debugging

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Mon Dec 4 17:06:54 PST 2017


            Bug ID: 35524
           Summary: [CodeView] Range-based for loop variables are not
                    available when debugging
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: DebugInfo
          Assignee: unassignedbugs at nondot.org
          Reporter: zturner at google.com
                CC: amccarth at google.com, dxf at google.com,
                    hans at chromium.org, llvm-bugs at lists.llvm.org,
                    llvm at inglorion.net, rnk at google.com

I encountered in yaml2coff.cpp.  In the function layoutCOFF, there is a loop
that begins like this.

  // Assign each section data address consecutively.
  for (COFFYAML::Section &S : CP.Obj.Sections) {

If you put a breakpoint in this loop and hover over S, or add a watch for it,
it displays as "Variable is optimized away and not available."

This is at O0, so we really need this.

I haven't tried to make a minimal repro yet, but hopefully it's straightforward
to do.  This should be easy enough for anyone to repro though.

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