Preprocessor Error In C
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#warning In C
Business Learn more about hiring developers or posting ads with us Stack Overflow Questions #error c++ Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, #error gcc just like you, helping each other. Join them; it only takes a minute: Sign up #error directive in C? up vote 21 down vote favorite 4 Can you please give the information about #error directive in
Error Directive Must Use C++ For The Type Iostream
C? What is #error directive? what the use of it? c share|improve this question edited Mar 13 '13 at 23:21 Kornel 62.7k24138200 asked Mar 16 '11 at 5:59 PHP 1,16431739 migrated from programmers.stackexchange.com Mar 16 '11 at 9:38 This question came from our site for professionals, academics, and students working within the systems development life cycle who care about creating, delivering, and maintaining software responsibly. 4 This seems more like a question for
C Preprocessor Message
stackoverflow.com –jmort253 Mar 16 '11 at 6:29 add a comment| 3 Answers 3 active oldest votes up vote 24 down vote accepted It's a preprocessor directive that is used (for example) when you expect one of several possible -D symbols to be defined, but none is. #if defined(BUILD_TYPE_NORMAL) # define DEBUG(x) do {;} while (0) /* paranoid-style null code */ #elif defined(BUILD_TYPE_DEBUG) # define DEBUG(x) _debug_trace x /* e.g. DEBUG((_debug_trace args)) */ #else # error "Please specify build type in the Makefile" #endif When the preprocessor hits the #error directive, it will report the string as an error message and halt compilation; what exactly the error message looks like depends on the compiler. share|improve this answer answered Mar 16 '11 at 6:09 geekosaur 34.7k47491 1 That is one paranoid null statement... –Chris Lutz Mar 16 '11 at 9:40 Wouldn't it be more appropriate to say it halts preprocessing? I guess preprocessing can be viewed as a step in compilation, but it can definitely be done as a separate step, and is internally performed as a separate step, so it fails/reports a fatal error earlier on than a compilation error. –RastaJedi Apr 19 at 19:57 add a comment| up vote 12 down vote I may have invalid code but its something like... #if defined USING_SQLITE && defined U
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Use Of #error Directive In C
about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack #error in excel Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping http://stackoverflow.com/questions/5323349/error-directive-in-c each other. Join them; it only takes a minute: Sign up #error directive in C? up vote 21 down vote favorite 4 Can you please give the information about #error directive in C? What is #error directive? what the use of it? c share|improve this question edited Mar 13 '13 at 23:21 Kornel 62.7k24138200 asked Mar 16 http://stackoverflow.com/questions/5323349/error-directive-in-c '11 at 5:59 PHP 1,16431739 migrated from programmers.stackexchange.com Mar 16 '11 at 9:38 This question came from our site for professionals, academics, and students working within the systems development life cycle who care about creating, delivering, and maintaining software responsibly. 4 This seems more like a question for stackoverflow.com –jmort253 Mar 16 '11 at 6:29 add a comment| 3 Answers 3 active oldest votes up vote 24 down vote accepted It's a preprocessor directive that is used (for example) when you expect one of several possible -D symbols to be defined, but none is. #if defined(BUILD_TYPE_NORMAL) # define DEBUG(x) do {;} while (0) /* paranoid-style null code */ #elif defined(BUILD_TYPE_DEBUG) # define DEBUG(x) _debug_trace x /* e.g. DEBUG((_debug_trace args)) */ #else # error "Please specify build type in the Makefile" #endif When the preprocessor hits the #error directive, it will report the string as an error message and halt compilation; what exactly the error message looks like depends on the compiler. share|improve this answer answered Mar 16 '11 at 6:
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