GDB's py-format-string test case depends on endianness. In particular it
relies on the first byte of the machine representation of 42 (as an int)
to be 42 as well. While this is indeed the case for little-endian
machines, big-endian machines store a zero in the first byte instead. The
wrong assumption leads to lots of FAILs on such architectures.
Fix this by filling the affected union with bytes of the same value, such
that endianness does not matter. Use the value 42, to keep the character
in the first byte unchanged.
gdb/testsuite/ChangeLog:
* gdb.python/py-format-string.c (string.h): New include.
(main): Fill a_struct_with_union.the_union.an_int with bytes of
the same value, for endianness-independence.
* gdb.python/py-format-string.exp (default_regexp_dict)
(test_pretty_structs, test_format): Adjust expected output to the
changed initialization.
The str () function, called on a gdb.Value instance, produces a string
representation similar to what can be achieved with the print command,
but it doesn't allow to specify additional formatting settings, for
instance disabling pretty printers.
This patch introduces a new format_string () method to gdb.Value which
allows specifying more formatting options, thus giving access to more
features provided by the internal C function common_val_print ().
gdb/ChangeLog:
2019-04-01 Marco Barisione <mbarisione@undo.io>
Add gdb.Value.format_string ().
* python/py-value.c (copy_py_bool_obj):
(valpy_format_string): Add gdb.Value.format_string ().
* NEWS: Document the addition of gdb.Value.format_string ().
gdb/doc/ChangeLog:
2019-04-01 Marco Barisione <mbarisione@undo.io>
* python.texi (Values From Inferior): Document
gdb.Value.format_string ().
gdb/testsuite/ChangeLog:
2019-04-01 Marco Barisione <mbarisione@undo.io>
Test gdb.Value.format_string ().
* gdb.python/py-format-string.exp: New test.
* gdb.python/py-format-string.c: New file.
* gdb.python/py-format-string.py: New file.
