Messages in this thread | | | Date | Tue, 7 Jan 2014 06:55:32 +0100 | From | Sam Ravnborg <> | Subject | Re: #pragma once? |
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On Mon, Jan 06, 2014 at 12:47:07PM -0800, Josh Triplett wrote: > [CCing build-system folks and others likely to know about potential > issues.] > > Does anyone have any objection to the use of "#pragma once" instead of > the usual #ifndef-#define-...-#endif include guard? GCC, LLVM/clang, > and the latest Sparse all support either method just fine. (I added > support to Sparse myself.) Both have equivalent performance. "#pragma > once" is simpler, and avoids the possibility of a typo in the defined > guard symbol. For kernel headers no concern.
For UAPI headers we should be more carefull - as we do not know which compiler it ends up seeing - and what version.
Sam
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