[libcxx-dev] gdb on libcxx-libcxxabi-libunwind-armv7-linux build bot

[Adhemerval Zanella via libcxx-dev]

Hi Sterling,

Maxim has asked to take a loot at it.  The failure is essentially:

FAIL: /home/buildslave/buildslave/libcxx-libcxxabi-libunwind-armv8-linux-noexceptions/llvm/projects/libcxx/test/pretty_printers/gdb_pretty_printer_test.sh.cpp:137
GDB printed:
   <incomplete type>
Value should match:
Traceback (most recent call last):
  File "/home/buildslave/buildslave/libcxx-libcxxabi-libunwind-armv8-linux-noexceptions/llvm/projects/libcxx/test/pretty_printers/gdb_pretty_printer_test.py", line 64, in invoke
    print("   " + check_literal)
TypeError: Can't convert 'bytes' object to str implicitly

I am not sure if it is something related to python2/3. The system does have
both installed (python 2.7.12 and 3.5.2, with 2 being the default).  I tried
to issue the faulty testcase with python3, and it shows the same issue

I am not very familiar with this code, but trying to make peace with
the types by changing it to:

 52             else:
 53                 check_literal = expectation_val.string(encoding="utf-8")
 54                 check_literal_utf8 = check_literal.encode("utf-8")
 55                 test_fails = value.encode("utf-8") != check_literal_utf8

Also does not help either.  For the change above, the first failure shows:

FAIL: /home/buildslave/buildslave/libcxx-libcxxabi-libunwind-armv8-linux-noexceptions/llvm/projects/libcxx/test/pretty_printers/gdb_pretty_printer_test.sh.cpp:137
GDB printed:
   Traceback (most recent call last):
  File "/home/buildslave/buildslave/libcxx-libcxxabi-libunwind-armv8-linux-noexceptions/llvm/projects/libcxx/utils/gdb/libcxx/printers.py", line 221, in to_string
    value_field = _value_of_pair_first(self.val["__r_"])
gdb.error: There is no member named __r_.

Value should match:
   "kdjflskdjf"

Which indicates that something is still missing here. I am checking if it
is possible to give you direct access to the bot.