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Use of #pragma in C - Stack Overflow 65 #pragma is used to do something implementation-specific in C, i e be pragmatic for the current context rather than ideologically dogmatic The one I regularly use is #pragma pack(1) where I'm trying to squeeze more out of my memory space on embedded solutions, with arrays of structures that would otherwise end up with 8 byte alignment
Difference between #pragma and _Pragma() in C - Stack Overflow 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
c - #pragma pack effect - Stack Overflow #pragma pack instructs the compiler to pack structure members with particular alignment Most compilers, when you declare a struct, will insert padding between members to ensure that they are aligned to appropriate addresses in memory (usually a multiple of the type's size) This avoids the performance penalty (or outright error) on some architectures associated with accessing variables that
What is __pragma and what are the differences between __pragma and #pragma #pragma is a preprocessor directive in its own right; it can't be used within a #define directive So, this is why __pragma exists: it provides a way for a pragma to be issued from wherever the macro that uses it is expanded This is a non-standard compiler extension (MSVC, Intel, and some C compilers support it to varying degrees)
What does #pragma comment mean? - Stack Overflow #pragma comment is a compiler directive which indicates Visual C++ to leave a comment in the generated object file The comment can then be read by the linker when it processes object files #pragma comment(lib, libname) tells the linker to add the 'libname' library to the list of library dependencies, as if you had added it in the project properties at Linker->Input->Additional dependencies
c++ - #pragma once vs include guards? - Stack Overflow For those who would like to use #pragma once and include guards together: If you are not using MSVC, then you won't get much optimization from #pragma once And you shouldn't put "#pragma once" into a header that supposed to be included multiple times with each inclusion possibly having a different effect
Where does the word pragma come from? - Stack Overflow A pragma (from the Greek word meaning action) is used to direct the actions of the compiler in particular ways, but has no effect on the semantics of a program (in general)
How can I prevent GCC optimizing some statements in C? In this case, the store has the side effect of causing a page fault, and you want the compiler to preserve the page fault This way, the surrounding code can still be optimized, and your code is portable to other compilers which don't understand GCC's #pragma or __attribute__ syntax
c - What does #pragma message do? - Stack Overflow The #pragma is a preprocessor directive that provides additional information to the compiler They are not part of the core language but allow for various compiler-specific customizations and optimizations The correct syntax for #pragma message requires the message to be enclosed in parentheses and double quotes The pragma message can be used to output a message during compilation For