On Mon, Dec 4, 2017 at 2:09 PM, Mathieu Malaterre <mathieu.malaterre@xxxxxxxxx> wrote: > Hi there, > > I've always assumed (before #pragma once), that sentinels were written like: > > https://en.wikipedia.org/wiki/Include_guard#Use_of_.23include_guards > > However grepping the linux source code I see: > > $ cat sound/soc/samsung/pcm.h > #ifndef __S3C_PCM_H > #define __S3C_PCM_H __FILE__ > <...> > #endif /* __S3C_PCM_H */ > > Why would any use: > > #define __S3C_PCM_H __FILE__ > > instead of the simpler: > > #define __S3C_PCM_H > > This is not a copy/paste error, as I can find other references: > > $ grep -r "#define" * | grep "_H " | grep __FILE|wc > 63 189 4996 Shouldn't you be asking the question in the Linux kernel mailing list for the definitive answer? > Thanks, > -- > Mathieu -- Best regards, Tadeus
