gcc preprocessor #error #warning West Sacramento California

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gcc preprocessor #error #warning West Sacramento, California

There are two kinds of macros. Normally, only the headers found in specific directories are considered system headers. Some macros are automatically defined for you. GCC provides an informative message when this occurs if '-v' is used.

If you write just the name, it is left alone. C preprocessors vary in some details. 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. That will start from the beginning, and find your new header again.

If somewhere after this #define directive there comes a C statement of the form foo = (char *) malloc (BUFFER_SIZE); then the C preprocessor will recognize and expand the macro BUFFER_SIZE. 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 Their exact behavior may depend on command-line flags supplied on invocation. Naturally you can spin any complexity here, but if it gets more then a few lines you may want to put the complexity into a separate script as cluttered Makefiles can

When the macro is expanded, however, it will all come out on one line. For example, #define foo() bar foo()baz expands to barbaz, not barbaz. Dr. The tokens following ‘#warning’ are used as the warning message.

This is unlikely to cause problems if you use double-quote includes, which are close enough to string constants. more hot questions question feed about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science The set of valid directive names is fixed. It may also be forbidden in open text; the standard is ambiguous.

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 The preprocessor will replace the macros with their definitions throughout the program. The macro here is written as all uppercase to emphasize that it is a macro, not a compiled function. The solution to this problem is to ensure that files do not mutually include each other, or to use "include guards" (see section 7.4.2 Providing your own templates for an example).

The C preprocessor is intended to be used only with C, C++, and Objective-C source code. There is also one way how to generate warning. of the atom whose 1s electron moves nearly at the speed of light? If you have a separate generated.sh script that too would be on the dependency list.

There are two kinds of comments. 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, It need not be exactly the same amount of whitespace, though. How should I deal with a difficult group and a DM that doesn't help?

Join them; it only takes a minute: Sign up C preprocessor: expand macro in a #warning up vote 19 down vote favorite 9 I would like to print a macro value It searches for a file named file first in the directory containing the current file, then in the same directories used for <file>. With the passing of Thai King Bhumibol, are there any customs/etiquette as a traveler I should be aware of? This is called a computed include.

If they need to be changed, they can be changed in one place, and programs that include the header file will automatically use the new version when next recompiled. These transformations correspond roughly to the first three "phases of translation" described in the C standard. You can't type the actual contents of the pre-processor definition. For example, #define lang_init() c_init() lang_init() expands to c_init() A function-like macro is only expanded if its name appears with a pair of parentheses after it.

For example, #if !defined(FOO) && defined(BAR) #error "BAR requires FOO." #endif The directive ‘#warning’ is like ‘#error’, but causes the preprocessor to issue a warning and continue preprocessing. 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 We recommend you avoid using it except for its defined purpose. c gcc c-preprocessor share|improve this question edited Nov 2 '14 at 18:56 AstroCB 7,656113261 asked Sep 28 '12 at 9:35 elomage 1,73811015 1 According to the C standard from 1999,

There is no way to convert a macro argument into a character constant. 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 3,2741820 answered May A preprocessing directive cannot cover more than one line. Such copying would be time-consuming and error-prone.

A more complex #if example can use operators, for example something like: #if !(defined __LP64__ || defined __LLP64__) || defined _WIN32 && !defined _WIN64 // we are compiling for a 32-bit Unlike normal parameter replacement, the argument is not macro-expanded first. Why does this execution plan have Compute Scalars? What happens if one brings more than 10,000 USD with them in the US?

lprintf ("success!\n") --> fprintf (log, "success!\n"); The above explanation is ambiguous about the case where the only macro parameter is a variable arguments parameter, as it is meaningless to try to The header file eliminates the labor of finding and changing all the copies as well as the risk that a failure to find one copy will result in inconsistencies within a Many implementations (including, e.g., the C compilers by GNU, Intel, Microsoft and IBM) provide a non-standard directive to print out a warning message in the output, but not stop the compilation