[Bug 6830] New: winedbg can't find debuginfo in core libraries when GNU_HASH section is present in wine-pthread

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=6830

Summary: winedbg can't find debuginfo in core libraries when
                    GNU_HASH section is present in wine-pthread
           Product: Wine
           Version: CVS
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-debug
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

On my x86 Fedora Core 6 machine, winedbg wasn't finding debuginfo for the core
wine libraries.

I tracked down the problem.  I compiled wine with the default FC-6 gcc which
passes --hash-style=gnu to the linker by default.  is_dt_flag_valid, not
recognizing the DT_GNU_HASH dynamic entry tag, returned 0 when called on that
tag.  This resulted in elf_load_file returning before setting
elf_info->dbg_hdr_addr, when loading wine-pthread.  elf_info->dbg_hdr_addr
remaining NULL meant that elf_enum_modules_internal returned early, and so
elf_enum_sync_cb wasn't being called for each of the core libraries.

I'm attaching a fix.