[Bug gdb/20645] New: Build with "-fdebug-types-section" -> Dwarf Error: wrong version in compilation unit header

["internet at 123gen dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20645

            Bug ID: 20645
           Summary: Build with "-fdebug-types-section" -> Dwarf Error:
                    wrong version in compilation unit header
           Product: gdb
           Version: 7.11.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: internet at 123gen dot com
  Target Milestone: ---

Hello,

On Windows (MinGW / Cygwin), when I build a test program with GCC with the
"-fdebug-types-section" option, I cannot debug the resulting program in GDB,
which errors out with:

    Reading symbols from test.exe...Dwarf Error: wrong version in compilation
unit header (is 1024, should be 2, 3, or 4) [in module /[...]/test.exe]

(the "1024" varies - sometimes "1", sometimes "0", depending on the source
program)

Tests:
- MinGW - GCC 6.2 & GDB 7.11.1 / 7.10: FAIL
- Cygwin - GCC 5.4 & GDB 7.10.1: FAIL
- Linux Mint - GCC 4.8 & GDB 7.7: SUCCESS

It is interesting this also fails on Cygwin; this leads me to believe this has
something to do with the way the ".debug_types" section is created or read from
in PE/COFF binaries (as opposed to ELF binaries, where it works fine).

I have verified I do in fact have a ".debug_types" section, and my homegrown
crash logger based on libdwarf <https://www.prevanders.net/dwarf.html> manages
to parse the debug data as usual (so it is of course far less strict than GDB).

I have no idea whether this is the right place to report this, nor which
component precisely is at fault.

Thanks for your help


Very basic repro:
- test.cpp:
    #include <algorithm>
    int main() { return 0; }
- g++ test.cpp -fdebug-types-section -g -o test.exe
- gdb test.exe

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