whats-new-cpp-docs.md

title	ms.date	description	ms.custom	monikerRange
What's new for the Microsoft C++ docs	06/26/2024	A list of new articles and doc updates for the Microsoft C/C++ compiler, ATL/MFC, C runtime, and standard library docs.	intro-whats-new	>=msvc-160

Microsoft C++ docs: What's new for November 2023 to June 2024

This article lists major changes to the Microsoft C++ docs for November 2023 to June 2024.

• For what was new in the docs in previous months, see What's new history.
• For what's new related to C++ in Visual Studio, see What's new for C++ in Visual Studio.
• For the latest C and C++ conformance with ISO standards status, see C++ conformance improvements in Visual Studio.

C/C++ compiler intrinsics and assembly language

Updated articles

• ARM64 intrinsics - added entries to table for new arm64 intrinsics

Active Template Library (ATL), Microsoft Foundation Classes (MFC)

Updated articles

• Setting the Dialog Box's Background Color - add code example for setting a dialog box's background color
• Unicode and Multibyte Character Set (MBCS) Support - Clarified MBCS support in unicode-and-multibyte-character-set-mbcs-support.md

C/C++ projects and build systems

New articles

• /ARM64XFUNCTIONPADMINX64 (Minimum x64 function padding)
• /NOFUNCTIONPADSECTION (Disable function padding)
• /experimental:log (Structured SARIF diagnostics)
• /feature (ARM64)
• /LINKREPROFULLPATHRSP (Generate file containing absolute paths of linked files)
• /Qspectre-jmp
• /volatileMetadata (Generate metadata on volatile memory accesses)
• Structured SARIF Diagnostics
• Tutorial: Troubleshoot function inlining on build time
• Tutorial: Troubleshoot header file impact on build time

Updated articles

• /LARGEADDRESSAWARE (Handle Large Addresses) - largeaddressaware:no isn't recommended for 64-bit apps
• /Qspectre - New /QSpectre flag
• /arch (ARM64) - document __arm_arch macro
• Advanced Property Page - add SARIF diagnostics documentation
• Linker options
  • new flag: /LINKREPROFULLPATHRSP
  • new linker switches for 17.8
• Linking - new linker switches for 17.8

C language

New articles

• typeof_unqual, __typeof_unqual__ (C23)
• typeof, __typeof__ (C23)

Updated articles

• C Keywords - conformance updates
• C Type Specifiers - conformance updates

Code quality

New articles

• Warning C26459
• Warning C26837
• Warning C26861
• Warning C26862
• Warning C26863
• Warning C26864
• Warning C6392
• Warning C6393
• Warning C6394
• Warning C6396
• Warning C6397
• Warning C6398

Updated articles

• Using Clang-Tidy in Visual Studio - fixed code example
• Warning C6031 - fix some code examples
• Warning C6059 - add heuristics
• Warning C6201 - add heuristics

C++ in Visual Studio

Updated articles

• break statement (C++) - doc fix
• Examples of Lambda Expressions - fixed code example
• Inline functions (C++) - address mistakes in inline functions cpp and remove content contrasting inline functions and macros

Cross platform development

Updated articles

• Install cross-platform mobile development with C++ - updates regarding Xamarin

C runtime library

Updated articles

• Translation mode constants - clarify that _O_TEXT is ANSI

C/C++ compiler and tools errors and warnings

New articles

• Compiler Error C2323
• Compiler Warning (level 1) C5072
• Compiler Warning (level 4) C5266
• Compiler warning (level 4) C5267
• Linker tools warning LNK4306
• Linker tools warning LNK4307
• Microsoft C/C++ compiler warnings C5000 through C5199
• Microsoft C/C++ compiler warnings C5200 through C5399

Updated articles

• Updated several compiler error and warning topics to include or refine examples.

C++ in Visual Studio tutorials

Updated articles

• Create a console calculator in C++

Read and write code using C++ in Visual Studio

New articles

• C++ Include Diagnostics in Visual Studio
• Visualize C/C++ macro expansion

Updated articles

• Walkthrough: Deploying Your Program (C++) - update steps

Linux with C++ in Visual Studio

Updated articles

• Connect to your target Linux system in Visual Studio

C/C++ in Visual Studio overview

New articles

• Microsoft Visual C++ compiler versioning

Updated articles

• C++ Conformance improvements, behavior changes, and bug fixes in Visual Studio 2022 - updates for 17.10, added _alignof
• Microsoft C++ docs: What's new for August 2023 to November 2023
• What's new for C++ in Visual Studio 2022 - updates for 17.10

C++ porting and upgrade guide

Updated articles

• C++ binary compatibility between Visual Studio versions - clarify linking binaries built with different versions of the toolset

C/C++ preprocessor reference

Updated articles

• Compiler warnings that are off by default - add new warning for VS 17.6 - C5266 & C5267 and add warning level info
• Predefined macros - documented __arm_arch macro

Overview of Windows programming in C++

Updated articles

• ClickOnce Deployment for Visual C++ Applications - fixed code example
• Microsoft Visual C++ Redistributable latest supported downloads - note 2013 no longer supported and other updates

What's new history

This section lists major changes to the Microsoft C++ docs for August 2023 to early November 2023.

Active Template Library (ATL), Microsoft Foundation Classes (MFC)

Updated articles

• CComDynamicUnkArray Class - updated remarks

C/C++ projects and build systems

New articles

• /ifcMap
• /Zc:checkGwOdr (Enforce Standard C++ ODR violations under /Gw)
• /KERNEL (Create kernel mode binary)

Updated articles

• Configure CMake debugging sessions - updated screenshots.
• /permissive- (Standards conformance) - reflect new behavior as of 17.6
• /Zc:externConstexpr (Enable extern constexpr variables) - reflect new behavior as of 17.6
• Overview of ARM64EC ABI conventions - ppdated register mapping for integer registers table
• /DEBUG (Generate debug info) - correct documentation for /DEBUG:FASTLINK and /DEBUG

Code quality

New articles

• Build reliable and secure C++ programs
• Warning C6395
• Warning C26479

Updated articles

• How to specify additional code information by using _Analysis_assume_ - updated remarks

Clarified behavior for the following warnings:

• Warning C6053
• Warning C26478
• Warning C26817
• Warning C26820

C++ in Visual Studio

New articles

• alignas (C++)

Updated articles

• alignas (C++) - updated remarks
• if-else statement (C++) - improved code examples
• __fastcall - added info about classes, structs, and unions
• decltype (C++) - fixed code example
• noreturn - improved example

C runtime library

Updated articles

• fegetround, fesetround - noted change of values for FE_UPWARD and FE_DOWNWARD

C/C++ compiler and tools errors and warnings

Updated articles

Clarified behavior for the following warnings:

• Compiler Error C2018, Compiler Error C2023
• Compiler Error C2024, Compiler Error C2049
• Compiler Error C2058, Compiler Error C2061
• Compiler Error C2082, Compiler Error C2129
• Compiler Error C2345, Compiler Error C2397
• Compiler Error C2510, Compiler Error C2534
• Compiler Error C2993, Compiler Error C3550
• Compiler Error C3551

Read and write code using C++ in Visual Studio

New articles

• Clean up C/C++ includes in Visual Studio
• Configure C/C++ Include Cleanup in Visual Studio
• Include Cleanup messages
• lnt-make-member-function-const
• lnt-naming-convention

C/C++ in Visual Studio overview

Updated articles

• C++ Conformance improvements, behavior changes, and bug fixes in Visual Studio 2022 - added conformance updates for 17.7 and 17.8.
• What's new for C++ in Visual Studio 2022 - updated what's new in C++.

C++ Standard Template Library (STL) reference

Updated articles

• auto_ptr class - added deprecation info

Active Template Library (ATL), Microsoft Foundation Classes (MFC)

Updated articles

• Connection maps - corrected parameter description of pRefCount in AfxConnection(Un)Advise
• CSimpleStringT Class - updated code example
• MFC class hierarchy chart - updated MFC hierarchy chart