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C Preprocessor Error And Warning

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C Preprocessor Error Macro

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C Preprocessor Define

them; it only takes a minute: Sign up How do I generate an error or warning in the C preprocessor? up vote 19 down vote favorite 1 I have a program that must be compiled only in DEBUG mode. (testing

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purpose) How can I have the preprocessor prevent compilation in RELEASE mode? c-preprocessor share|improve this question edited Jun 25 at 23:11 phs 7,05822761 asked Feb 8 '10 at 12:29 Eonil 31k43203376 add a comment| 7 Answers 7 active oldest votes up vote 34 down vote accepted Place anywhere: #ifndef DEBUG #error Only Debug builds are supported #endif share|improve this answer answered Feb 8 '10 at 12:33 Hans Passant 653k819531598 add a comment| up vote 11 down vote C provide c preprocessor tutorial a #error statement, and most compilers add a #warning statement. The gcc documentation recommends to quote the message. share|improve this answer edited Nov 17 '15 at 17:28 answered Feb 8 '10 at 12:37 philant 22.8k94890 1 @Antonio Right, there is no [more] recommendation there. I replaced the link with one to gcc doc. –philant Nov 17 '15 at 17:29 add a comment| up vote 4 down vote You can use a error directive for that. The following code will throw an error at compile time if DEBUG is not defined: #ifndef DEBUG #error This is an error message #endif share|improve this answer edited Feb 8 '10 at 23:32 answered Feb 8 '10 at 12:34 Laurent Etiemble 20.9k44075 Sorry, I mix pragma and error while typing. Corrected in answer. –Laurent Etiemble Feb 8 '10 at 23:32 add a comment| up vote 4 down vote Maybe something more sofisticated, but it is only copy&paste of previous solutions. :-) #ifdef DEBUG #pragma message ( "Debug configuration - OK" ) #elif RELEASE #error "Release configuration - WRONG" #else #error "Unknown configuration - DEFINITELY WRONG" #endif P.S. There is also one way how to generate warning. Create unreferenced labe like HereIsMyWarning: and don't reference it. During compilation you will get warning like 1>..\Example.c(71) : warning C4102: 'HereIsMyWarning' : unreferenced label share|improve this answer edited May 27 '15 at 15:20 Janito Vaqueiro Ferreira Filho 3,2641820 answered May

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings c preprocessor ifdef and policies of this site About Us Learn more about Stack Overflow c preprocessor ## operator the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation c preprocessor concatenate Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it http://stackoverflow.com/questions/2221517/how-do-i-generate-an-error-or-warning-in-the-c-preprocessor only takes a minute: Sign up Portability of #warning preprocessor directive up vote 38 down vote favorite 2 I know that the #warning directive is not standard C/C++, but several compilers support it, including gcc/g++. But for those that don't support it, will they silently ignore it or will it result in a compile failure? In other words, can I http://stackoverflow.com/questions/171435/portability-of-warning-preprocessor-directive safely use it in my project without breaking the build for compilers that don't support it? c++ compiler-construction warnings c-preprocessor portability share|improve this question edited Jun 3 at 20:00 Brian Tompsett - 汤莱恩 3,083112675 asked Oct 5 '08 at 3:40 jonner 3,03041827 add a comment| 5 Answers 5 active oldest votes up vote 19 down vote accepted It is likely that if a compiler doesn't support #warning, then it will issue an error. Unlike #pragma, there is no recommendation that the preprocessor ignore directives it doesn't understand. Having said that, I've used compilers on various different (reasonably common) platforms and they have all supported #warning. share|improve this answer answered Oct 5 '08 at 3:53 Greg Hewgill 509k1088771043 add a comment| up vote 60 down vote It should be noted that MSVC uses the syntax: #pragma message ( "your warning text here" ) The usual #warning syntax generates a fatal error C1021: invalid preprocessor command 'warning' so it is not portable to those compilers. share|improve this answer answered Nov 11 '08 at 0:30 nolandda 1,09721015 19 This i

resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers https://msdn.microsoft.com/en-us/library/c8tk0xsk.aspx Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. C/C++ Preprocessor Reference Preprocessor Preprocessor Directives Preprocessor Directives #error Directive #error Directive #error Directive #define Directive #error Directive #if, #elif, #else, and #endif Directives #ifdef and #ifndef Directives #import Directive #include Directive #line Directive Null Directive #undef Directive #using Directive TOC Collapse the table of c preprocessor content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. #error Directive (C/C++) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003  The #error directive emits a user-specified error message at compile time and then c preprocessor error terminates the compilation.Syntax Copy #errortoken-string RemarksThe error message that this directive emits includes the token-string parameter. The token-string parameter is not subject to macro expansion. This directive is most useful during preprocessing for notifying the developer of a program inconsistency or the violation of a constraint. The following example demonstrates error processing during preprocessing: Copy #if !defined(__cplusplus) #error C++ compiler required. #endif See AlsoPreprocessor Directives Show: Inherited Protected Print Export (0) Print Export (0) Share IN THIS ARTICLE Is this page helpful? Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you! We appreciate your feedback. Dev centers Windows Office Visual Studio Microsoft Azure More... Learning resources Microsoft Virtual Academy Channel 9 MSDN Magazine Community Forums Blogs Codeplex Support Self support Programs BizSpark (for startups) Microsoft Imagine (for students) United States (English) Newsletter Privacy & cookies Terms of use Trademarks © 2016 Microsoft © 2016 Microsoft

 

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