Find all needed information about Gcc Support Pragma Once. Below you can see links where you can find everything you want to know about Gcc Support Pragma Once.
https://stackoverflow.com/questions/787533/is-pragma-once-a-safe-include-guard
GCC supports #pragma once since 3.4, see http://en.wikipedia.org/wiki/Pragma_once for further compiler support. The big upside I see on using #pragma once as opposed to include guards is to avoid copy/paste errors.
https://en.wikipedia.org/wiki/Pragma_once
In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation. Thus, #pragma once serves the same purpose as include guards, but with several advantages, including: less code, avoidance of name clashes, and sometimes improvement in …
https://www.howtobuildsoftware.com/index.php/how-do/PE2/gcc-mingw-does-mingw-482-support-pragma-once
The real question is whether gcc (the compiler portion of the MinGW system) supports #pragma once. The answer is yes. The #pragma feature is actually supported by the C preprocessor used by gcc, which is documented separately.
https://www.geeksforgeeks.org/pragma-directive-in-c-c/
Sep 11, 2018 · This happens because GCC does not support #pragma startup or exit. However, you can use the below code for a similar output on GCC compilers. However, you can use the below code for a similar output on GCC compilers.1.8/5
https://dmalcolm.fedorapeople.org/gcc/2015-08-31/rst-experiment/pragmas-accepted-by-gcc.html
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.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58770
The GCC preprocessor is very optimized for include guards. Perhaps the same optimizations are not applied for "#pragma once". Someone will need to investigate where the two code paths differ and what could be the reason for the slow-down.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11569
#pragma once used in a.h file indicates that it is only to be parsed once, even if it is (directly or indirectly) included multiple times in the same source file. However, every time you use this pragma, you get a warning saying it is "obsolete", and there seems to be no compiler option to turnoff this warning.
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