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

[cvs-commit at gcc dot gnu.org]

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

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by Martin Liska <marxin@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=06ce017c7d73f90db1c99f9e6a56c486b0313864

commit 06ce017c7d73f90db1c99f9e6a56c486b0313864
Author: Martin Liska <mliska@suse.cz>
Date:   Wed Aug 3 22:31:09 2022 +0200

    dwarf: use find_abstract_instance for vars and DW_AT_specification

    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

    With the patch the same output is emitted as before usage of dwz.

    bfd/ChangeLog:

            PR 29442
            * dwarf2.c (struct varinfo): Use const char * type.
            (scan_unit_for_symbols): Call find_abstract_instance for
            DW_AT_specification for variables that can be in a different CU
            (e.g. done by dwz)

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