[LLVMbugs] [Bug 14660] New: debug info loop condition checks should be associated with the loop header, not the end of the scope

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14660

             Bug #: 14660
           Summary: debug info loop condition checks should be associated
                    with the loop header, not the end of the scope
           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, echristo at gmail.com,
                    llvmbugs at cs.uiuc.edu
            Blocks: 14330
    Classification: Unclassified


given:

while (*myp > 0) {
  (*myp)++;
}

Clang produces a line table that includes the condition test on the 3rd line
(the closing '}') leading to the jump back to the start of the loop.

GCC produces a line table that associates that condition test with the first
line of the code, not the 3rd.

GCC's behavior makes more sense to me as I expect the condition test to be
matched to the line on which the user wrote the condition.

Causes failures in gdb.threads/schedlock.exp

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