Hello!

I have fixed abseil[1] on GNU/Hurd Debian and also
libgav1[2] for testing it. They both work well.
The libgav1 patch will be posted on another thread
later.

There are some problems related to kernel in
debugging feature. They can be safely disabled
like other platforms that do not support it. I
have disabled them, since they don't affect the
normal functionality. I plan to discuss them
with kernel developers soon. After that, I can
push the patch to upstream.

The fix is fairly simple. Basically, I did,

- Mark GNU/Hurd supporting `mmap` and `write`

  - No `mmap` makes it fail to build.

  - No `write` makes the log unit test fail. Because some
    death unit tests suppose the error message to be printed
    before the program crash and `write` is used to avoid
    glibc cache.

- Fix macro and header including bug. I don't know why I
  have to add `#include <signal.h>` on GNU/Hurd. Maybe the
  source relies on indirect including on other platforms. 

- Errno and message are totally different on GNU/Hurd. I
  have ported them for GNU/Hurd.

- Disable symbolize and signal stack memory consumption
  test due to the kernel related problems mentioned above.

Thanks for people who helped me!

Yuqian Yang (6):
  GNU/Hurd: mark support mmap, write. fix misuse macro.
  GNU/Hurd: fix missing signal.h including.
  GNU/Hurd: fix errno and message.
  GNU/Hurd: disable vdso on GNU/Hurd.
  GNU/Hurd: disable symbolize.
  GNU/Hurd: skip signal consumption test.

 absl/base/config.h                                | 2 +-
 absl/base/internal/raw_logging.cc                 | 2 +-
 absl/base/internal/strerror_test.cc               | 5 +++++
 absl/debugging/internal/stack_consumption_test.cc | 3 +++
 absl/debugging/internal/symbolize.h               | 2 +-
 absl/debugging/internal/vdso_support.h            | 2 ++
 absl/log/internal/test_helpers.cc                 | 4 ++++
 absl/log/log_modifier_methods_test.cc             | 6 ++++--
 absl/log/stripping_test.cc                        | 4 ++--
 9 files changed, 23 insertions(+), 7 deletions(-)

[1] https://salsa.debian.org/debian/abseil
[2] https://salsa.debian.org/multimedia-team/libgav1
-- 
Yuqian Yang <crup...@crupest.life>

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