Build Issues with CMake >= 3.26.0

[aschneuw]

Problem description

When building with CMake >= 3.26.0 the dependency build QCodeEditor fails with a compilation error (QT include libraries)

Steps to reproduce (important)

• Same Dockerfile as in master with the following changes:
• • using cmake from (https://pypi.org/project/cmake/3.26.0/)
• • ubuntu 20.04 base image instead of 18.04

Workaround

Add -std=c++11 to 3rdparty/QCodeEditor/CMakeLists.txt target_compile_options

if(CMAKE_COMPILER_IS_GNUCXX)
target_compile_options(QCodeEditor
PRIVATE
-ansi
-pedantic
-Wall
-Wextra
-Weffc++
-Woverloaded-virtual
-std=c++11
-Winit-self
-Wunreachable-code
)
endif(CMAKE_COMPILER_IS_GNUCXX)

[zdavkeos]

I can confirm the suggested change works. I suggest making a pr.