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C #error Preprocessor

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C++ Static_assert

a minute: Sign up How can I force a compile error in C++? up vote 10 down vote favorite I would like to create a compile-time error in my C++ code with a custom error message. I want to do this for a couple of reasons: to force compilation to fail while I'm working on new features which haven't been implemented

#if In C

yet. (compile time ! TODO reminder) to create a more readable error when attempting to implement an unsupported template specialization. I'm sure there is a trick to doing this but I cant find a resource explaining the method. I would wrap the code in a #define of the form COMPILE_FAIL("error message"); Thanks D c++ debugging compilation compiler-errors output share|improve this question asked Jan 31 '13 at 19:51 Dominic Birmingham 8518 2 What you need is static_assert. stackoverflow.com/questions/6765770/compile-time-assertion –legends2k Jan 31 '13 at 19:54 did you try #error ? –thang Jan 31 '13 at 20:05 static_assert totally does the job on msvc10... :-) –Dominic Birmingham Jan 31 '13 at 20:59 add a comment| 3 Answers 3 active oldest votes up vote 27 down vote Use #error: #error "YOUR MESSAGE" This produces an error from the preprocessor. If you want to detect an error at a later stage (e.g. during template processing), use static_assert (a C++11 feature). share|improve this answer answered Jan 31 '13 at 19:53 nneonneo 98.6k19121219 add a comment| up vote 14 down vote Look into static_a

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation 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 http://stackoverflow.com/questions/14633987/how-can-i-force-a-compile-error-in-c other. Join 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 purpose) How can I have the preprocessor prevent compilation in RELEASE mode? c-preprocessor share|improve this question http://stackoverflow.com/questions/2221517/how-do-i-generate-an-error-or-warning-in-the-c-preprocessor edited Jun 25 at 23:11 phs 7,05722761 asked Feb 8 '10 at 12:29 Eonil 31.1k43203377 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 655k819611605 add a comment| up vote 11 down vote C provide 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 22.9k94890 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

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss http://stackoverflow.com/questions/17959728/annotation-processor-generating-a-compiler-error the workings and policies of this site About Us Learn more http://stackoverflow.com/questions/1752607/how-to-intentionally-cause-a-custom-java-compiler-warning-message about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation 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 generate compiler each other. Join them; it only takes a minute: Sign up Annotation Processor, generating a compiler error up vote 10 down vote favorite 4 I'm trying to create a custom annotation that, for example, ensures that a field or method is both public and final, and would generate a compile time error if the field or method is generate compiler error not both public and final, as in these examples: // Compiles @PublicFinal public final int var = 2; // Compiles @PublicFinal public final void myMethod {} // Compile time error @PublicFinal private final int fail = 2; So far, I've made both the custom annotation interface: import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Documented @Retention(RetentionPolicy.SOURCE) @Target({ElementType.METHOD, ElementType.FIELD}) public @interface PublicFinal { } and Processor: import javax.annotation.processing.AbstractProcessor; import javax.annotation.processing.RoundEnvironment; import javax.annotation.processing.SupportedAnnotationTypes; import javax.lang.model.element.Modifier; import javax.lang.model.element.TypeElement; import java.util.Set; @SupportedAnnotationTypes("PublicFinal") public class PubicFinalProcessor extends AbstractProcessor { @Override public boolean process( Set annotations, RoundEnvironment roundEnv) { for (TypeElement typeElement : annotations) { Set modifiers = typeElement.getModifiers(); if (!modifiers.contains(Modifier.FINAL) || !modifiers.contains(Modifier.PUBLIC)) { // Compile time error. // TODO How do I raise an error? } } // All PublicFinal annotations are handled by this Processor. return true; } } As hinted by the TODO, I do not know how to generate the compile time error. The documentation of Processor makes it clear that I should not be throwing an exception, If a

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation 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 only takes a minute: Sign up How to intentionally cause a custom java compiler warning message? up vote 56 down vote favorite 36 I'm about to commit an ugly temporary hack in order to work around a blocking issue while we wait for an external resource to be fixed. Aside from marking it with a big scary comment and a bunch of FIXMEs, I'd love to have the compiler throw an obvious warning message as a reminder so we don't forget to take this out. For example, something like: [javac] com.foo.Hacky.java:192: warning: FIXME temporary hack to work around library bug, remove me when library is fixed! Is there a way I can cause an intentional compiler warning with a message of my choosing? Failing that, what's the easiest thing to add to the code to throw an existing warning, with perhaps a message in a string on the offending line so it gets printed in the warning message? EDIT: Deprecated tags don't seem to be doing anything for me: /** * @deprecated "Temporary hack to work around remote server quirks" */ @Deprecated private void doSomeHackyStuff() { ... } No compiler or runtime errors in eclipse or from sun javac 1.6 (running from ant script), and it's definitely executing the function. java compiler-warnings javac share|improve this question edited Nov 18 '09 at 0:29 asked Nov 17 '09 at 23:27 pimlottc 1,41011517 1 FYI: the @Deprecated only gives a compiler warning, not a compiler or runtime error. The code should definitely run –BalusC Nov 18 '09 at 3:16 Try running with javac directly. I suspect Ant is hiding some output. Or see my updated answer below for more details. –Peter Recore Nov 18 '09 at 4:00 add a comment| 9 Answers 9 active oldest votes up vote 27 down vote accepted One technique that I've seen used is to tie this into unit testing (you do unit test, right?). Basically you create a unit test that fails once the external resource fix is achieved. Then you comment that unit test to tell ot

 

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