Gcc Support Pragma Once

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c++ - Is #pragma once a safe include guard? - Stack Overflow

    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.

pragma once - Wikipedia

    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 …

Gcc - Does Mingw 4.8.2 support ' #pragma once'

    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.

#pragma Directive in C/C++ - GeeksforGeeks

    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

Pragmas Accepted by GCC — gcc 6 documentation

    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.

58770 – GCC very slow compiling with #pragma once

    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.

there's no substitute for #pragma once - GCC, the GNU ...

    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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