[LLVMbugs] [Bug 14498] New: debug info line table for functions starts at the first statement rather than the opening brace

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14498

             Bug #: 14498
           Summary: debug info line table for functions starts at the
                    first statement rather than the opening brace
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: googler
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: dblaikie at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
            Blocks: 14330
    Classification: Unclassified


For:
  1 void
  2 func
  3 (
  4 )
  5 {
  6 return;
  7 }

With frame pointers enabled (gcc default, clang -fno-omit-frame-pointer
-mno-omit-leaf-frame-pointer)

GCC produces this line table:
  address line
  0       5
  4       6
  5       7
  7       7

Clang produces this line table:
  0       5
  4       6
  6       6

While the trailing line might be debatable, it might be helpful to have Clang
break in at the same initial location ("{"). This would help pass several GDB
7.5 tests (sevenal in gdb.cp/namespace.exp, one in gdb.python/python.exp)

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