Re: #pragma once?

[Patrick Palka]

On Mon, Jan 6, 2014 at 3:47 PM, Josh Triplett <josh@xxxxxxxxxxxxxxxx> wrote:
> 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.

Unfortunately in GCC #pragma once is slower and slightly buggier than
regular include guards:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58770
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