Detect presence of multi-config generators

Code
1

If I have multi-config generators there are some configs I would like to remove for performance reasons I read about here, what’s the best way to do this?
I.e. at what stage can I expect the GENERATOR_IS_MULTI_CONFIG to be set? Naively tried at the top of a project but even on eg MacOS it was not set then. Thanks!

2

It’s a property, not a variable:

get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
# use `is_multi_config`
3

Thanks, yes should have stated that I’ve gotten so far. I just don’t see it ever kicking in for my Xcode or VS builds, so that’s where I’m confused.
It seems like just hard-coding the CMAKE_CONFIGURATION_TYPES to the types I use has a positive impact on the configuration time, so would just like to have that soft-coded instead.

4

What version of CMake are you using? Note that it’s new in 3.9. That seems older than most would use, but it’s the first thing to check…

5

Yes sorry, it’s 3.16.3, and looks like this:

cmake_minimum_required(VERSION 3.15.4)
project(myproj)
get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
if (is_multi_config)
	message(STATUS "is multiconfig")
else()
	message(STATUS "not multiconfig")
endif()
6

That’s really strange… Probably worth an issue AFAICT from that code.

7

Thanks - probably something stupid I do anyway. I hope to upgrade cmake quite soon so can test then again (I can’t test these locally alas).