Search results
Jan 9, 2024 · In C, the #pragma directive is a special purpose directive that is used to turn on or off some features. #pragma also allows us to provide some additional information or instructions to the compiler. It is compiler-specific i.e., the behavior of pragma directive varies from compiler to compiler.
#pragma is for compiler directives that are machine-specific or operating-system-specific, i.e. it tells the compiler to do something, set some option, take some action, override some default, etc. that may or may not apply to all machines and operating systems. See msdn for more info. edited Mar 25, 2017 at 18:28. MD XF. 8,061 9 42 72.
Apr 4, 2021 · Pragma Directives: The pragma directive is used to control the actions of the compiler in a particular portion of a program without affecting the program as a whole. Pragma directives are included in the C program to take effect.
_Pragma is an operator, much like sizeof or defined, and can be embedded in a macro. Its syntax is _Pragma (string-literal), where string-literal can be either a normal or wide-character string literal. It is destringized, by replacing all ‘ \\ ’ with a single ‘ \ ’ and all ‘ \" ’ with a ‘ " ’.
The pragma directive is used to access compiler-specific preprocessor extensions. A common use of #pragma is the #pragma once directive, which asks the compiler to include a header file only a single time, no matter how many times it has been imported: #pragma once. // header file code.
Aug 3, 2017 · Pragma directives specify machine- or operating-specific compiler features. The __pragma keyword, which is specific to the Microsoft compiler , enables you to code pragma directives within macro definitions.
In computer programming, a directive or pragma (from "pragmatic") is a language construct that specifies how a compiler (or other translator) should process its input. Depending on the programming language, directives may or may not be part of the grammar of the language and may vary from compiler to compiler.
30.1 Pragmas. A pragma is an annotation in a program that gives direction to the compiler. • Pragma Basics. Pragma syntax and usage. • Severity Pragmas. Settings for compile-time pragma output. • Optimization Pragmas.
GCC supports several types of pragmas, primarily in order to compile code originally written for other compilers. Note that in general we do not recommend the use of pragmas; See Declaring Attributes of Functions , for further explanation.
Mar 30, 2022 · The #pragma directives offer a way for each compiler to offer machine- and operating system-specific features, while maintaining overall compatibility with the C and C++ languages. Pragma directives are machine-specific or operating system-specific by definition, and are typically different for every compiler.
