test cases: use C++17 for protobuf because of abseil-cpp

On the openSUSE builder, we got a horrifying CI failure like:
```
FAILED: asubdir/subdir-prog.p/main.cpp.o
c++ -Iasubdir/subdir-prog.p -Iasubdir '-I../test cases/frameworks/5 protocol buffers/asubdir' -fdiagnostics-color=always -D_GLIBCXX_ASSERTIONS=1 -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -std=c++14 -O0 -g -DPROTOBUF_USE_DLLS -DNOMINMAX -MD -MQ asubdir/subdir-prog.p/main.cpp.o -MF asubdir/subdir-prog.p/main.cpp.o.d -o asubdir/subdir-prog.p/main.cpp.o -c '../test cases/frameworks/5 protocol buffers/asubdir/main.cpp'
In file included from /usr/include/google/protobuf/stubs/common.h:20,
                 from /usr/include/google/protobuf/io/coded_stream.h:107,
                 from asubdir/subdir-prog.p/defs.pb.h:26,
                 from ../test cases/frameworks/5 protocol buffers/asubdir/main.cpp:1:
/usr/include/absl/strings/string_view.h:52:26: error: ‘string_view’ in namespace ‘std’ does not name a type
   52 | using string_view = std::string_view;
      |                          ^~~~~~~~~~~
[...]
```

This turns out to be because of a *huge* mess with abseil-cpp and protobuf. We're
still trying to handle it in Gentoo, even (see bgo#912819) and https://github.com/gentoo/gentoo/pull/32281.

In summary, abseil-cpp started to require C++17 (unless built with a special option
which causes ABI problems). Let's switch the protobuf test case to use C++17
accordingly. There's some precedence for Just Doing This, like in cb54f0d707e5673eb1d8aaafae59a6d5fde25e18
recently for Boost, and 792a84199b8829c923968e8816a27e021647d146 previously for
protobuf itself.

Bug: https://bugs.gentoo.org/912819
See also: https://github.com/gentoo/gentoo/pull/32281
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
1 file changed
tree: 628d9f80c8e99b1d348e9439542048a965b68fd1
  1. .github/
  2. ci/
  3. cross/
  4. data/
  5. docs/
  6. graphics/
  7. man/
  8. manual tests/
  9. mesonbuild/
  10. packaging/
  11. test cases/
  12. tools/
  13. unittests/
  14. .editorconfig
  15. .flake8
  16. .gitattributes
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  22. CODEOWNERS
  23. contributing.md
  24. COPYING
  25. MANIFEST.in
  26. meson.py
  27. pyproject.toml
  28. README.md
  29. run_cross_test.py
  30. run_format_tests.py
  31. run_meson_command_tests.py
  32. run_mypy.py
  33. run_project_tests.py
  34. run_single_test.py
  35. run_tests.py
  36. run_unittests.py
  37. setup.cfg
  38. setup.py
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  40. skip_ci.py
README.md

Status

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Dependencies

  • Python (version 3.7 or newer)
  • Ninja (version 1.8.2 or newer)

Latest Meson version supporting previous Python versions:

  • Python 3.6: 0.61.5
  • Python 3.5: 0.56.2
  • Python 3.4: 0.45.1

Installing from source

Meson is available on PyPi, so it can be installed with pip3 install meson. The exact command to type to install with pip can vary between systems, be sure to use the Python 3 version of pip.

If you wish you can install it locally with the standard Python command:

python3 -m pip install meson

For builds using Ninja, Ninja can be downloaded directly from Ninja GitHub release page or via PyPi

python3 -m pip install ninja

More on Installing Meson build can be found at the getting meson page.

Creating a standalone script

Meson can be run as a Python zip app. To generate the executable run the following command:

./packaging/create_zipapp.py --outfile meson.pyz --interpreter '/usr/bin/env python3' <source checkout>

Running

Meson requires that you have a source directory and a build directory and that these two are different. In your source root must exist a file called meson.build. To generate the build system run this command:

meson setup <source directory> <build directory>

Depending on how you obtained Meson the command might also be called meson.py instead of plain meson. In the rest of this document we are going to use the latter form.

You can omit either of the two directories, and Meson will substitute the current directory and autodetect what you mean. This allows you to do things like this:

cd <source root>
meson setup builddir

To compile, cd into your build directory and type ninja. To run unit tests, type ninja test.

More on running Meson build system commands can be found at the running meson page or by typing meson --help.

Contributing

We love code contributions. See the contribution page on the website for details.

IRC

The channel to use is #mesonbuild either via Matrix (web interface) or OFTC IRC.

Further info

More information about the Meson build system can be found at the project's home page.

Meson is a registered trademark of Jussi Pakkanen.