[llvm-bugs] [Bug 24716] New: .debug_lines wrong when inlined functions are used.

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https://llvm.org/bugs/show_bug.cgi?id=24716

            Bug ID: 24716
           Summary: .debug_lines wrong when inlined functions are used.
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dawn+bugzilla at burble.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When inlined functions are used, Clang trunk reports 0 for line entries while
older clang versions report non-existent lines.  To reproduce, compile the
following source using:
    clang++ -c -g -o x.o x.cpp

x.h:
    struct S {
        int a;
        S() : a(3) {}
        int mfunc() {
            return a;
        }
    };

x.cpp:
    // Skip lines from x.h so we can make sure we're not seeing any lines
    // reported from them in x.cpp.
    // x.h:
    //    struct S {
    //        int a;
    //        S() : a(3) {}
    //        int mfunc() {
    //            return a;
    //        }
    //    };
    #include "x.h"
    S s;

then dump the .debug_line entries with your favorite dwarf dumper.  objdump
--dwarf=decodedline was used here.  Using clang 3.4, we see:
    CU: ./x.cpp:
    File name                            Line number    Starting address
    x.cpp                                         12               0x3b0

    x.cpp                                         12               0x3bb
    x.cpp                                          3               0x3d0
#FIXME!
    x.cpp                                          3               0x3d4
#FIXME!

    ./x.h:
    x.h                                            3               0x3e0
    x.h                                            3               0x3f0
    x.h                                            3               0x400
    x.h                                            3               0x40c

The inlined code from the header file is being reported as being in x.cpp. 
Using Clang 3.6 and trunk, these line numbers are 0 but still wrong.

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