How to use CRT SECURE NO WARNINGS

Question

I have compile error in my simple MFC window application generated from wizard with several lines of code      error C4996   strncpy   This function or variable may be unsafe  Consider using strncpy s instead  To disable deprecation  use  CRT SECURE NO WARNINGS  See online help for details    I set Configuration Properties gt  gt C C   gt  gt Preporocessor gt  gt Preprocessor Definitions gt  gt   CRT NONSTDC NO WARNINGS  But this does t helped  I have another very close project that generates only warning in this place and it has no  CRT NONSTDC NO WARNINGS definition   Only difference between projects is several different options in wizard   Why  CRT NONSTDC NO WARNINGS does not helps in first project and why second project compiles without problems without this definition

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I was getting the same error in Visual Studio 2017 and to fix it just added  define  CRT SECURE NO WARNINGS after  include  quot pch h quot   include  quot pch h quot   define  CRT SECURE NO WARNINGS

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For a quick fix or test  I find it handy just adding  define  CRT SECURE NO WARNINGS to the top of the file before all  include   define  CRT SECURE NO WARNINGS  include     int main

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Visual Studio 2019 with CMake Add the following to CMakeLists txt  add definitions -D CRT SECURE NO WARNINGS

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Add by     Configuration Properties  C C    Preporocessor  Preprocessor   Definitions    CRT SECURE NO WARNINGS

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Under  Project -  Properties -  C C   -  Preprocessor -  Preprocessor Definitions  add  CRT SECURE NO WARNINGS

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Adding  CRT SECURE NO WARNINGS to Project -  Properties -  C C   -  Preprocessor -  Preprocessor Definitions didn t work for me  don t know why    The following hint works   In stdafx h file  please add   define  CRT SECURE NO DEPRECATE   before include other header files

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If your are in Visual Studio 2012 or later this has an additional setting  SDL checks  Under  Property Pages -  C C   -  General     Additional Security Development Lifecycle  SDL  recommended checks  includes enabling additional secure code generation features and extra security-relevant warnings as errors      It defaults to YES - For a reason  I E you should use the secure version of the strncpy   If you change this to NO you will not get a error when using the insecure version   SDL checks in vs2012 and later

[c++] How to use _CRT_SECURE_NO_WARNINGS

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