On 10/10/22 05:55, Volker Hilsheimer via Development wrote:
Hi,


We are using `#pragma once` in a number of examples and tests in the Qt source 
tree, but I don’t think we have officially endorsed it in favour of explicit 
include guards.

#pragma once is “non-standard but widely supported” [1], with some caveats, 
e.g. when there are multiple header files with the same name (which each 
compiler then handles differently, as there is no standard).

 From what I see, it should in practice be ok to use. But perhaps I’m missing 
something. Does anything speak against using ‘#pragma once’ in new files?

Speaking as co-maintainer of CMake, we have effectively required #pragma once to build CMake itself since August 2017, we officially codified this as policy in September 2020, and we will soon be writing a clang-tidy plugin to enforce this in our CI. We have not received any complaints about it. Just my $0.02.

Kyle

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