Can't find std::shared_mutex

kitfox

std::shared_mutex was added with the c++ 17 standard, but it does not seem to be available when I #include <shared_mutex>. I've configured my .pro file to use CONFIG += c++20, but the standard library appears to only be from c++ 14. How would I be able to link against a later standard library?

https://en.cppreference.com/w/cpp/header/shared_mutex

KroMignon

@kitfox I think you have to change CONFIG += c++20 to CONFIG += c++17, AFAIK CONFIG += c++20 do not exist ==> https://doc.qt.io/qt-5/qmake-variable-reference.html#config

Or maybe use CONFIG += c++latest

jsulm

@kitfox You forgot to mention the compiler (including exact version) you're using.

kitfox

How would I check that?

jsulm

@kitfox said in Can't find std::shared_mutex:

How would I check that?

In your Kit configuration

kitfox

This is what my kit screens look like. How do I tell what compiler will link against c++17? I tried switching to Qt 5.14.1, but that still doesn't have it.

KroMignon

@kitfox I think you have to change CONFIG += c++20 to CONFIG += c++17, AFAIK CONFIG += c++20 do not exist ==> https://doc.qt.io/qt-5/qmake-variable-reference.html#config

Or maybe use CONFIG += c++latest

kitfox

That worked. Thanks.