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  • Use of #pragma in C - Stack Overflow
    #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
    has the same effect as #pragma GCC dependency "parse y" The same effect could be achieved using macros, for example #define DO_PRAGMA(x) _Pragma (#x) DO_PRAGMA (GCC dependency "parse y") According to IBM tutorial: The _Pragma operator is an alternative method of specifying #pragma directives For example, the following two statements are
  • What does #pragma once mean in C? - Stack Overflow
    So if #pragma once fails the old method will still work 2023 update I see some people in the comment section advocate for using guards instead of #pragma once This makes little to no sense in 2023 and beyond unless you are targeting some special compiler that you know does not support #pragma once
  • 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)
  • c - #pragma pack effect - Stack Overflow
    #pragma pack specifically is used to indicate that the struct being packed should not have its members aligned It's useful when you have a memory mapped interface to a piece of hardware and need to be able to control exactly where the different struct members point It is notably not a good speed optimization, since most machines are much faster at dealing with aligned data
  • c++ - What does #pragma comment mean? - Stack Overflow
    Compiler companies usually create their own extensions to facilitate their features For example, (I believe) Microsoft started the "#pragma once" deal and it was only in MS products, now I'm not so sure Pragma Directives It includes "#pragma comment" in the table you'll see HTH I suspect GCC, for example, has their own set of #pragma's
  • 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
  • Where does the word pragma come from? - Stack Overflow
    The programming language Ada was quite possibly the first compiler to use pragma to specify preprocessor directives The word was used as a shortened form of "pragmatic information" When the C programming language was designed it didn't initially have pragma directives, but was quickly added to the specification to support custom compiler
  • What is the use of #pragma section lt;XYZ gt; in C?
    #pragma name If the preprocessor recognizes the specified "name", it performs whatever action they stand for, or passes information on to the compiler If "name" is not supported by the c implementation it's ignored For example gcc compiler accept the list of pragmas listed here For the #pragma section, the documentation of gcc said:
  • What is the use of pragma code section and data section?
    The CODE_SECTION pragma allocates space for the func in a section named section name The CODE_SECTION pragma is useful if you have code objects that you want to link into an area separate from the text section The syntax of the pragma in C could be: #pragma CODE_SECTION (func, "section name") The syntax of the pragma in C++ could be:





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