CMake doesn't require GCC 8 or later, but uses a GCC-8-or-later option about gui_starter_template HOT 2 CLOSED

I made a pull request #10 that has some relevance to this issue.

On my branch, I specified that Travis-CI should use gcc-7 instead of gcc-5. This causes the vm to install GCC 7.4.0, which handles all of the specified compiler flags without any problem, and the build completes successfully. I claim that this is evidence that GCC 7.4.0 (I can't speak to version 7.3.x and below) supports the -Wduplicated-branches flag.

As far as I can tell, a CMakeLists.txt file does not have any way to tell you what compiler version you should be using: it either builds or it fails.

Maybe we could add a command line option that conditionally adds warning flags based on what compiler you specify? Alternately, you could use try_compile() to work out what warning flags are available on whatever compiler you're using, and set the warning flags accordingly.

from gui_starter_template.

Since the readme now recommends gcc 7 or above, I think this is resolved. If you disagree, you are welcome to reopen this.

from gui_starter_template.