CODEWITHSUNDEEP
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gary
gary

Reputation: 521

Suppressing "use of the 'X' attribute is a C++17 extension" warnings

I'm using Qt Creator and I have CONFIG += c++17 in my .pro file, and I'm using the nodiscard attribute where appropriate. However, the compiler still needlessly warns that use of the '[[nodiscard]]' attribute is a C++17 extension.

Is there a way to suppress that particular warning? Or even all warnings of the type "X is a C++XX extension"? I've looked everywhere for a flag to include in CXXFLAGS without success.

I'm using Qt Creator version 4.9.2 and g++ version 8.3.0

Upvotes: 1

Views: 560

Answers (1)

Xplatforms
Xplatforms

Reputation: 2232

Since Qt 5.12 you can use config flag CONFIG += c++17

Before Qt 5.12 you need to add compiler flags through qmake flags: QMAKE_CXXFLAGS += -std=c++17 for GCC & MinGW and QMAKE_CXXFLAGS += /std:c++latest or QMAKE_CXXFLAGS += /std:c++17 <- depends on MSVC compiler you are using.

Here is Qt qmake manual variable reference for more info

And Gerrit code review of task QTBUG-67527 for even more info

After you have added this flags:

  1. run qmake on the project again

  2. clean your project. (delete shadow build folder if necessary)

  3. rebuild your project

Upvotes: 1

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