[Bug binutils/29442] New: objdump: DWARF error: could not find variable specification at offset 0x3d3 with dwz

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=29442

            Bug ID: 29442
           Summary: objdump: DWARF error: could not find variable
                    specification at offset 0x3d3 with dwz
           Product: binutils
           Version: 2.37
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: mliska at suse dot cz
  Target Milestone: ---

The following simple test case fails when dwz is used:

$ cat demo.C
namespace std {
  enum { _S_fixed, _S_floatfield = _S_fixed };
  struct {
    struct {};
  }
  __ioinit;
}

int main() {
  return 0;
}

$ g++ demo.C -g && cp a.out b.out && dwz -m xxx.so a.out b.out && objdump -S
a.out >/dev/null
objdump: DWARF error: could not find variable specification at offset 0x3d3

As seen the reference is defined in xxx.so shared part:

$ eu-readelf -w -N a.out | grep -A3 -B3 3d3
             decl_column          (data1) 11
             sibling              (ref_udata) [   387]
 [   387]    variable             abbrev: 30
             specification        (GNU_ref_alt) [   3d3]
             location             (exprloc) 
              [ 0] addr 0x404019
 [   396]    subprogram           abbrev: 32

$ eu-readelf -w -N a.out | less

...

 Compilation unit at offset 920:
 Version: 5, Abbreviation section offset: 0, Address size: 8, Offset size: 4
 Unit type: partial (3)
...
 [   3d3]      variable             abbrev: 31
               name                 (strp) "__ioinit"
               decl_file            (data1) demo.C (10)
               decl_line            (data1) 6
               decl_column          (data1) 3
               type                 (ref_udata) [   3c4]
               declaration          (flag_present) yes

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