Re: [patch] use __asm__ and __volatile__ in i386/arm/s390 byteorder.h

From: H. Peter Anvin
Date: Mon Jun 18 2007 - 14:10:08 EST


Robert Hancock wrote:
>
> If we expect userspace apps to include them, then I would vote for no,
> not for anything outside of #ifdef __KERNEL__ in exported headers. Keep
> in mind also that C++ apps may need to include these as well and those
> extensions don't always play well in C++ mode. (Last instance I ran into
> was the ioctl argument checking macros _IOR, _IOW, etc. that create
> non-compiling code if you use them in a C++ program.)
>

Some of the actual ioctl macros generate silently wrong code if you use
them in a C program.

-hpa
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