gcc compiler directives #error Venus Texas

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gcc compiler directives #error Venus, Texas

An example of a function-like macro is: #define RADTODEG(x) ((x) * 57.29578) This defines a radians-to-degrees conversion which can be inserted in the code where required, i.e., RADTODEG(34). If you do this and you have inadvertently left incomplete or debug code in the image, then your compilation will fail. If you look at the warning generated with #warning, you'll typically see a number associated with it. To do this, click on the Project menu, select Properties..., and in the Build targets tab you can click on Release and then click on the Delete button.

Reply Nigel Jones says: September 27, 2011 at 6:05 pm An interesting comment Patrick. No macro expansion takes place. Is git really so easy to use that you can manage the cascade of branches that would occur during a typical debugging session? Perhaps this explains why device drivers for Windows / Linux cause so many problems?

An explanation over how these macros work can be found here. How much is "a ladleful"? Reply Andrew Neil says: September 27, 2011 at 5:54 pm The fundamental problem, of course, is that #warning is non-standard directive - so not all compilers support it. Why does this execution plan have Compute Scalars?

Is there any job that can't be automated? Then you can achieve something close to what you want: #include #define xstr(s) str(s) #define str(s) #s #define err_msg(x) #x " is " xstr(x) #define AAA 17 static_assert(AAA != 17, Real world variables Recent CommentsNigel Jones on A tutorial on signed and unsigned integersNigel Jones on A tutorial on signed and unsigned integersNigel Jones on Lowering power consumption tip #3 - The desired compile-time output would be warning: AAA = 17 What do I use for ???, or, how do I augment the code?

c-preprocessor share|improve this question 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 Related Published Jul 20, 2011 Do not republish this article, in whole or in part, on any other website. When you have a bunch of modified files you can choose to add/remove all or part of any changed file to/from the staging area. For instance, the GNU C preprocessor can be made more standards compliant by supplying certain flags.[5] Compiler-specific preprocessor features[edit] The #pragma directive is a compiler-specific directive, which compiler vendors may use

Either FIX_FOR_RELEASE() // Code that must be removed or fixed before you can release or FIX_FOR_RELEASE(statement that must be removed or fixed before you can release); share|improve this answer answered Feb Retrieved 1 May 2008. ^ Beal, Stephan (August 2004). "Supermacros". Once things are fixed/improved you selectively merge to your main tree only the parts that make sense. Therefore I'd use standard #error and not non-standard #warning.

It replaces comments with whitespace. One little-known usage pattern of the C preprocessor is known as X-Macros.[2][3][4] An X-Macro is a header file. Finally commit the (hopefully) fixed patch. Compilers running in non-standard mode must not set these macros, or must define others to signal the differences.

Deleting the Release mode only does it for the current project, so you can still use it in other projects. what I'd really like is an understanding of the way(s) to do "assert" in C…. asked 4 years ago viewed 20628 times active 1 year ago Visit Chat Linked 61 How do I show the value of a #define at compile-time? 46 Static assert in C A typical use is to warn about the usage of some old code, which is now deprecated and only included for compatibility reasons, e.g.: (GNU, Intel and IBM) #warning "Do not

asked 6 years ago viewed 15920 times active 1 year ago Visit Chat Linked 5 Prevent systemverilog compilation if certain macro isn't set 0 preprocessing directives to prevent a project from Browse other questions tagged c-preprocessor or ask your own question. DEBUG #define FIX_FOR_RELEASE(statement) _Pragma ("GCC error \"Must be fixed for release version\"") #else #define FIX_FOR_RELEASE(statement) statement #endif You can use this macro for temporary hacks, for example to get around code Including files[edit] One of the most common uses of the preprocessor is to include another file: #include int main(void) { printf("Hello, world!\n"); return 0; } The preprocessor replaces the line

Related 376How to generate a stacktrace when my gcc C++ app crashes465What is the difference between g++ and gcc?9#pragma init and #pragma fini using gcc compiler on linux1644Why doesn't GCC optimize is the commenting a mistake?). The tokens following ‘#warning’ are used as the warning message. You would have one branch for debugging an issue.

The second edition of the C Standard, C99, added support for __func__, which contains the name of the function definition within which it is contained, but because the preprocessor is agnostic The use of #warning is simple enough: #warning This is a warning This will result in the compiler issuing a warning with the text ‘This is a warning' printed to stderr. Either form should be fine to use since they are both standard. –Lundin Sep 29 '12 at 18:45 add a comment| up vote 2 down vote Many times I have my See comments at get_last_object." #endif If you have several configuration parameters that must be set up by the installation in a consistent way, you can use conditionals to detect an inconsistency

Before I delve into the uses of #warning, I must warn you (if you would pardon the pun) that #warning is a non standard directive. Neither ‘#error’ nor ‘#warning’ macro-expands its argument. The line must consist of complete tokens. Related 507Why use apparently meaningless do-while and if-else statements in C/C++ macros?8What C preprocessor macros have already been defined in gcc?43Does the C preprocessor strip comments or expand macros first?1Is there

The values of __FILE__ and __LINE__ can be manipulated with the #line directive. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. Dr. 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.

I usually find that at least 2/3 of the diff gets dropped at this point. 9. I don't really get the "Use a proper version control system" comment. generated.h: Makefile echo >generated.h "// WARNING: generated file. Harney 13.9k42027 1 We might be able to provide a better answer if you tell us why you want compilation to stop. –Michael Jan 23 '10 at 22:22 add a

Reply Nigel Jones says: September 27, 2011 at 2:48 pm Wow! Does a survey require an ethical approval? Fix me! /* Experimental code goes here */ #endif } In this case whenever I compile the module, I get a warning (i.e. I use "#pragma message" instead, as in #pragma message("WARNING in" __FILE__ ": Code disabled") I then have a script that extracts these messages from the build output and displays them to

For example, a project's policy might require that all sources compile with -Werror but certain files might have exceptions allowing specific types of warnings. Token stringification[edit] The # operator (known as the "Stringification Operator") converts a token into a string, escaping any quotes or backslashes appropriately. Similarly, the outer pair of parentheses maintain correct order of operation. Object-like macros were conventionally used as part of good programming practice to create symbolic names for constants, e.g., #define PI 3.14159 instead of hard-coding the numbers throughout the code.

This file contains a list of similar macro calls, which can be referred to as "component macros". For instance the following: // debugging macros so we can pin down message origin at a glance #define WHERESTR "[file %s, line %d]: " #define WHEREARG __FILE__, __LINE__ #define DEBUGPRINT2(...) fprintf(stderr, My problem is that in the code bases that I touch, device driver development in Windows and Linux, it's common to get hundreds to thousands of warnings. Hack away at the code as much as I want, changing things, commenting code, whatever. 4.

share|improve this answer edited Jan 4 '13 at 8:04 answered Sep 28 '12 at 10:22 Gilbert 2,06679 add a comment| up vote 1 down vote If you really want to emit Otherwise, it tests if a macro _WIN32 is defined instead. It seems like an additional step that just wouldn't happen consistently enough.