CMake build config

[guoh27]

No description provided.

[gmarcais]

Not to get into a compilation system war, but is there a compelling reason to use CMake that Autotools does not cover? It is a relatively simple project, I am more used to Autotools and don't yet see a clear benefit to switching.

The proposed CMakelists.txt does not generate the noshell.pc file and does not support testing.

[guoh27]

Now cmake is full available.
It will get the version from configure.ac.
And contains both installation and testing content.

[gmarcais]

That looks more promising. I changed the base to branch develop. Also, when trying your PR, I get the following error:

gusqt@gus-laptop ~/D/NoShell  1 > cmake -S . -B build-cmake                                                                                          45163d1?
CMake Warning (dev) at /usr/share/cmake/Modules/GNUInstallDirs.cmake:243 (message):
  Unable to determine default CMAKE_INSTALL_LIBDIR directory because no
  target architecture is known.  Please enable at least one language before
  including GNUInstallDirs.
Call Stack (most recent call first):
  CMakeLists.txt:4 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

[guoh27]

An exists issue #409

[gmarcais]

It seems to compile and run the test properly, and I should merge that PR. I have one more request: although I did ask to be able to run the tests, can the dependency on gtest be optional? One should be able to compile and install the library even if gtest is not installed. If gtest is not installed, the testing programs are not compiled and at most a warning is printed.

[guoh27]

Yes, gtest is optional, you can turn off the build of tests by passing -DNOSHELL_BUILD_TESTS=OFF to cmake, for example cmake -S . -B build -DNOSHELL_BUILD_TESTS=OFF,
At the same time, when NoShell is the topmost project, this option is ON by default, and when it is in another project's build tree, this option is OFF by default.

[gmarcais]

Thank you for the PR. I merged it. It will appear in the next version.