[cmake-developers] Retrieving OS Version in CMake

[Brad King]

Would there be a use case for a Module that could retrieve
OS name and version

We do have these variables:

https://cmake.org/cmake/help/v3.11/variable/CMAKE_HOST_SYSTEM_NAME.html
https://cmake.org/cmake/help/v3.11/variable/CMAKE_HOST_SYSTEM_VERSION.html

and this command:

https://cmake.org/cmake/help/v3.11/command/cmake_host_system_information.html

but...

(e.g. on macOS parse “sw_vers” to get “Mac OS X” and “10.13.4”, on Linux
parse /etc/os-release to get “Fedora” and “28”)?

...they don't go down to this level of detail. Perhaps the

cmake_host_system_information

command could be taught additional queries for that.

-Brad
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[Harry Mallon]

Hi Brad,

I hadn't seen cmake_host_system_information, that is pretty useful. It already parses "sw_vers" on macOS. "OS_RELEASE" is "10.13.5" for example. So that is half of the problem. This does mean that "OS_NAME" does not equal "CMAKE_HOST_SYSTEM_NAME" on macOS, which is indicated by the docs. (https://cmake.org/cmake/help/v3.11/command/cmake_host_system_information.html).

Would you say on Linux we would change the values of current cmake_host_system_information variables to match the intent on macOS? Or is it best to add new fields?

e.g. one of the below?
* OS_NAME: "Linux" -> "Fedora", OS_RELEASE: "$(uname -r)" -> "28"
* OS_RELEASE: "$(uname -r)" -> "Fedora 28"
* LINUX_DISTRO: "Fedora 28"

It seems at the moment that macOS behaves slightly differently to Linux. I haven’t tried Windows or other yet. Maybe the docs for cmake_host_system_information should be expanded to cover behaviour on common platforms and a little more info on intent of each thing?

Best,
Harry


Harry Mallon
CODEX | Senior Software Engineer
60 Poland Street | London | England | W1F 7NT
E ***@codex.online | T [phone]
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[Brad King]

Post by Harry Mallon
Or is it best to add new fields?

We should only add new fields and revise documentation to match
existing behavior.

Post by Harry Mallon
e.g. one of the below?
* OS_NAME: "Linux" -> "Fedora", OS_RELEASE: "$(uname -r)" -> "28"
* OS_RELEASE: "$(uname -r)" -> "Fedora 28"
* LINUX_DISTRO: "Fedora 28"

A separate LINUX_DISTRO sounds good, but we'd need to make sure
whatever convention is used for the version (in the name or as
a separate value) makes sense for all distros' conventions.

-Brad
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