How to enable C 17 compiling in Visual Studio

Question

I want to use C  17 features   How can I switch compiling from C  14 to C  17 in Microsoft Visual Studio   Or it s not avaiable in release versions of VS

User · Answer

If bringing existing Visual Studio 2015 solution into Visual Studio 2017 and you want to build it with c  17 native compiler  you should first Retarget the solution projects to v141   THEN the dropdown will appear as described above   Configuration Properties -  C C   -  Language -  Language Standard

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MSBuild  Visual Studio project solution   vcproj   sln    Add to Additional options in Project Settings   std c  latest to enable latest features - currently C  17 as of VS2017  VS2015 Update 3    https   blogs msdn microsoft com vcblog 2016 06 07 standards-version-switches-in-the-compiler    permissive- will disable non-standard C   extensions and will enable standard conformance in VS2017   https   blogs msdn microsoft com vcblog 2016 11 16 permissive-switch   EDIT  Oct 2018   The latest VS2017 features are documented here   https   docs microsoft com en-gb cpp build reference std-specify-language-standard-version  VS2017 supports   std  c  14 c  17 c  latest  now  These flags can be set via the project s property pages      To set this compiler option in the Visual Studio development   environment         Open the project s Property Pages dialog box  For details  see Working   with Project Properties     Select Configuration Properties  C C      Language     In C   Language Standard  choose the language standard to   support from the dropdown control  then choose OK or Apply to save   your changes       CMake   Visual Studio 2017  15 7   supports CMake projects  CMake makes it possible to enable modern C   features in various ways  The most basic option is to enable a modern C   standard by setting a target s property in CMakeLists txt   add library    PROJECT NAME   set property  TARGET   PROJECT NAME    PROPERTY       Enable C  17 standard compliance     CXX STANDARD 17     In the case of an interface library   add library    PROJECT NAME  INTERFACE  target compile features    PROJECT NAME    INTERFACE       Enable C  17 standard compliance     cxx std 17

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There s now a drop down  at least since VS 2017 3 5  where you can specifically select C  17  The available options are  under project   Properties   C C     Language   C   Language Standard    ISO C  14 Standard  msvc command line option   std c  14 ISO C  17 Standard  msvc command line option   std c  17 The latest draft standard  msvc command line option   std c  latest    I bet  once C  20 is out and more fully supported by Visual Studio it will be  std c  20

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Visual studio 2019 version  The drop down menu was moved to   Right click on project  not solution  Properties  or Alt   Enter  From the left menu select Configuration Properties General In the middle there is an option called  quot C   Language Standard quot  Next to it is the drop down menu Here you can select Default  ISO C   14  17 or latest

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Visual Studio 2020 version In tasks json file   after you build and debug with the g  -9  Add -std c  2a for 2020 features  c  1z for 2017 features   Add -fconcepts to use concept keyword  quot args quot         quot -std c  2a quot       quot -fconcepts quot       quot -g quot       quot   file  quot       quot -o quot       quot   fileDirname    fileBasenameNoExtension  quot      now compile and you can use the 2020 features

User · Answer

Visual Studio 2015 Update 3 does not support the C  17 feature you are looking for  emplace back   returning a reference    Support For C  11 14 17 Features  Modern C     C  11 14 17 Features In VS 2015 RTM  VS 2015 Update 2   s STL is C  17-so-far Feature Complete  Visual Studio 2015 Update 3  STL Fixes In VS 2015 Update 3

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