[PATCH 0/4] various libctf-specific fixes

[Nick Alcock]

These are a bunch of things that have accumulated over the last few
months.  One of them could in theory be considered a format change
(since it extends the meaning of the variable section), but the
variable section is rarely used, its use is off by default with
the default linker flags, and in practice no users of this feature
are negatively affected and all actually work slightly better with
this change.

The most important change is a fix to sourceware bug 28933, a buffer
overrun when libctf reads in uncompressed (i.e., probably very small)
CTF that was generated on a machine of the opposite endianness.
To prevent this happening again we generalize the byteswapper so that
it can be used to swap out of the native endianness as well as into
it, and add an environment variable that can be used when debugging
to force writeout of the CTF dict in the non-native endianness
instead, so we can finally properly test the code paths that only
kick in when byteswapping.

Nick Alcock (4):
  ld, testsuite: improve CTF-availability test
  include, libctf, ld: extend variable section to contain functions too
  libctf, ld: diagnose corrupted CTF header cth_strlen
  libctf: add LIBCTF_WRITE_FOREIGN_ENDIAN debugging option

 include/ctf.h                                 |   8 +-
 .../ld-ctf/data-func-conflicted-vars.d        |  69 ++++++
 ld/testsuite/ld-ctf/diag-cttname-invalid.s    |   2 +-
 ld/testsuite/ld-ctf/diag-cttname-null.s       |   2 +-
 ld/testsuite/ld-ctf/diag-cuname.s             |   2 +-
 ld/testsuite/ld-ctf/diag-parlabel.s           |   2 +-
 ld/testsuite/ld-ctf/diag-parname.s            |   2 +-
 ld/testsuite/ld-ctf/diag-strlen-invalid.d     |   5 +
 ...ttname-invalid.s => diag-strlen-invalid.s} |   0
 ld/testsuite/lib/ld-lib.exp                   |  24 +-
 libctf/ctf-impl.h                             |   2 +
 libctf/ctf-link.c                             |  37 ++-
 libctf/ctf-open.c                             | 102 +++++---
 libctf/ctf-serialize.c                        | 219 +++++++++---------
 14 files changed, 322 insertions(+), 154 deletions(-)
 create mode 100644 ld/testsuite/ld-ctf/data-func-conflicted-vars.d
 create mode 100644 ld/testsuite/ld-ctf/diag-strlen-invalid.d
 copy ld/testsuite/ld-ctf/{diag-cttname-invalid.s => diag-strlen-invalid.s} (100%)


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