[LLVMbugs] [Bug 7811] New: Linker (llvm-ld) lose debug information on global variables even without optimizations enabled

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7811

           Summary: Linker (llvm-ld) lose debug information on global
                    variables even without optimizations enabled
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Linker
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: quickslyver at free.fr
                CC: llvmbugs at cs.uiuc.edu


Reproducer:

$cat bug.c
int a;

$clang -c -emit-llvm -g -O0 bug.c -o bug.bc
$llvm-ld -no-shell-script bug.bc -v -disable-inlining -disable-opt -b linked.bc
$llvm-dis bug.bc && llvm-dis linked.bc
$cat bug.ll
[...cut...]
!0 = metadata !{i32 524340, i32 0, metadata !1, metadata !"a", metadata !"a",
metadata !"a", metadata !1, i32 1, metadata !3, i1 false, i1 true, i32* @a} ; [
DW_TAG_variable ]
[...cut...]

$ cat linked.ll
[...cut...]
!0 = metadata !{i32 524340, i32 0, metadata !1, metadata !"a", metadata !"a",
metadata !"a", metadata !1, i32 1, metadata !3, i1 false, i1 true, null} ; [
DW_TAG_variable ]
[...cut...]

------------------------------------------------
"i32* @a" is replaced by "null".
Is there some "hidden" optimizations even with "-disable-inlining -disable-opt"
because if I use "llvm-link" instead of "llvm-ld" there is not this bug.

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