gcc preprocessor error Waialua Hawaii

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gcc preprocessor error Waialua, Hawaii

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. The include file is then referenced repeatedly. Except for expansion of predefined macros, all these operations are triggered with preprocessing directives. So what is the correct solution?

These mostly correspond to the syntactic tokens used by the C compiler, but there are a few differences. Dr. Header files serve two purposes. and __VA_ARGS__).

C Preprocessor Trick For Implementing Similar Data Types Retrieved January 9, 2011. ↑ Meyers, Randy (May 2001). "The New C: X Macros". GCC accepts the ASCII control sequences LF, CR LF, CR, and LFCR as end-of-line markers. Arduino and 7-segment LED counter driven by two tactile switches I have posted on YouTube a couple of videos about a project I made with the Arduino prototype board. All these tricks are extremely confusing and should not be used in code intended to be readable.

This is called token pasting or token concatenation. See Argument Prescan for detailed discussion. File star.def: EXPAND_EXPAND_STAR_MEMBER(x, int) EXPAND_EXPAND_STAR_MEMBER(y, int) EXPAND_EXPAND_STAR_MEMBER(z, int) EXPAND_EXPAND_STAR_MEMBER(radius, double) #undef EXPAND_EXPAND_STAR_MEMBER File star_table.c: typedef struct { #define EXPAND_EXPAND_STAR_MEMBER(member, type) type member; #include "star.def" } starStruct; void serialize_star(const starStruct *const star, For example, the following might be added to the above code: #define print_int(val) printf("%d", val) #define print_double(val) printf("%g", val) void print_star(const starStruct *const star) { /* print_##type will be replaced with

It could be updated to use #include and std::cout instead. <<< previous table of contents next >>> Published under the terms of the GNU General Public I'm not sure whether static_assert was included in C99 or C11, it is certainly in C11. You can continue a line comment onto the next line with backslash-newline. You could include the old header with an absolute pathname: #include "/usr/include/old-header.h" This works, but is not clean; should the system headers ever move, you would have to edit the new

What are you trying to achieve with this anyway? –Alexey Frunze Sep 28 '12 at 9:41 I have a hierarchy of many makefiles that define AAA in various ways, It exists to cause the standard header file limits.h to work correctly. Why microcontroller takes many clock cycles to start up with PLL clock source? Example: #include /* incorrect */ int main (void) { printf ("Hello World!\n"); return 0; } The program above tries to include the non-existent file 'stdoi.h' giving the error 'stdoi.h: No

Parameters are not replaced inside string constants, but you can use the # preprocessing operator instead. Spaces or tabs are permitted between the # and error, but not escape characters or other symbols or macros. String literals are string constants, character constants, and header file names (the argument of #include). Initial processing Tokenization The preprocessing language Initial processing The preprocessor performs a series of textual transformations on its input.

Instead, you can write a series of adjacent string constants and stringified arguments. If the new definition is effectively the same, the redefinition is silently ignored. A few compilers define WIN32 instead. In standard C, no string literal may extend past the end of a line.

The preprocessor will replace the stringified arguments with string constants. Text is available under the Creative Commons Attribution-ShareAlike License.; additional terms may apply. The solution is not to use macro at all. We recommend it be used only when there is no other alternative.

The #define directive is used to define values or macros that are used by the preprocessor to manipulate the program source code before it is compiled. C++ compilers use the same C preprocessor.[1] The preprocessor is a part of the compiler which performs preliminary operations (conditionally compiling code, including files etc...) to your code before the compiler The line may, however, be continued with backslash-newline, or by a block comment which extends past the end of the line. This immunity is granted on an ad-hoc basis, when we find that a warning generates lots of false positives because of code in macros defined in system headers.

Parentheses need not balance, and the body need not resemble valid C code. (If it does not, you may get error messages from the C compiler when you use the macro.) For example you are trying to compile Mozilla SpiderMonkey 1.7 and one of the compiler lines is the following: /usr/bin/gcc -Djs_1_7_EXPORTS -DXP_UNIX -DSVR4 -DSYSV -D_BSD_SOURCE -DPOSIX_SOURCE -DHAVE_LOCALTIME_R -DX86_LINUX -D_IEEE_LIBM -DJS_EDITLINE -DEDITLINE Common Predefined Macros The common predefined macros are GNU C extensions. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.

The language of preprocessor directives is only weakly related to the grammar of C, and so is sometimes used to process other kinds of text files. NUL is a special case because of the high probability that its appearance is accidental, and because it may be invisible to the user (many terminals do not display NUL at Other uses[edit] Since the C preprocessor can be invoked separately from the compiler with which it is supplied, it can be used separately, on different languages. This is the path by which the preprocessor opened the file, not the short name specified in #include or as the input file name argument.

It simply looks for the file named, starting with the directory in the search path after the one where the current file was found. There are also six digraphs, which the C++ standard calls alternative tokens, which are merely alternate ways to spell other punctuators. For example, in the m68k-aout environment it expands to an _, but in the m68k-coff environment (as TIGCC is) it expands to nothing. You can have named arguments as well as variable arguments in a variadic macro.

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 By convention, values defined using #define are named in uppercase. System header files declare the interfaces to parts of the operating system. The number of arguments you give must match the number of parameters in the macro definition.

But what if you want to refer to the old header from the new one? Is the NHS wrong about passwords? Why (in universe) are blade runners called blade runners? Besides, what is there that you want to warn against but not throw an error against?

This stage corresponds roughly to the standard's "translation phase 4" and is what most people think of as the preprocessor's job. NOTE: The explicit inline declaration is not really necessary unless the definition is in a header file, since your compiler can inline functions for you (with gcc this can be done This is called a computed include.