Ubuntu 22.04

[garethsb]

To start with, apply patch for non-constant SIGSTKSZ. See #259.

[garethsb]

I think the Ubuntu 14.04 failure was an intermittent one.

This patch seems to solve the Catch compile issue on Ubuntu 22.04, but... I'm seeing the install test step fail... looks like an issue with bst::optional being std::optional when building my-nmos-node, but presumably being boost::optional when building the rest of nmos-cpp. That's odd, because C++17 is the default language standard with GCC 11.2, so I expected std::optional throughout.

[garethsb]

Ah, the problem will be related to #206...

We currently have:

nmos-cpp/Development/cmake/NmosCppCommon.cmake

Lines 22 to 24 in dff1585

	if(NOT DEFINED CMAKE_CXX_STANDARD)
	set(CMAKE_CXX_STANDARD 11)
	endif()

This CMake file is included when building the library (and example apps in the same go) but not when building my-nmos-node. The nmos-cpp::compile-settings have this to specify the minimum requirements:

nmos-cpp/Development/cmake/NmosCppCompileSettings.cmake

Line 2 in dff1585

target_compile_features(compile-settings INTERFACE cxx_std_11)

Generally, maybe we should default to the compiler default (remove setting CMAKE_CXX_STANDARD completely), so that with GCC 11.2 it would build with C++17 unless overridden by the user. The reason we didn't is that the default for GCC 4 and GCC 5 is C++98, which ain't gonna work.

[garethsb]

The reason we didn't is that the default for GCC 4 and GCC 5 is C++98, which ain't gonna work.

Huh, so the Ubuntu 14.04 build has succeeded too. OK then...

[garethsb]

Assuming the latest build-test is all green ✔️ I think this could be squash merged and resolves #251 and resolves #259.