[Clfs-support] Problem with Linux (2.6.17.13-09092006) header

[David Whitney]

Hello,

I've been trying to track down the URL where I can look for additional
patches (if any) for the Linux kernel that I used to build CLFS.  I am
having trouble compiling an application that uses the swab.h header file in
the /usr/include/linux/byteorder directory.

Here's the error I am getting:
archiver Makefile - compiling: source/cdrom/ArcCDInterface.cpp
In file included from
/home/whitney/olymed/olylfs/usr/include/linux/byteorder/little_endian.h:12,
                 from
/home/whitney/olymed/olylfs/usr/include/asm/byteorder.h:6,
                 from
/home/whitney/olymed/olylfs/usr/include/linux/cdrom.h:14,
                 from source/cdrom/ArcCDInterface.cpp:25:
/home/whitney/olymed/olylfs/usr/include/linux/byteorder/swab.h:80:1: error:
"___constant_swab16" redefined
/home/whitney/olymed/olylfs/usr/include/linux/byteorder/swab.h:55:1: error:
this is the location of the previous definition
/home/whitney/olymed/olylfs/usr/include/linux/byteorder/swab.h:81:1: error:
"___constant_swab32" redefined
/home/whitney/olymed/olylfs/usr/include/linux/byteorder/swab.h:59:1: error:
this is the location of the previous definition
/home/whitney/olymed/olylfs/usr/include/linux/byteorder/swab.h:82:1: error:
"___constant_swab64" redefined
/home/whitney/olymed/olylfs/usr/include/linux/byteorder/swab.h:65:1: error:
this is the location of the previous definition
make[1]: *** [release/cdrom/ArcCDInterface.o] Error 1


Upon examination of swab.h, it is quite apparent what is causing the issue.
Here's a sample:

 55 #define ___constant_swab16(x) \
 56         ((__u16)( \
 57                 (((__u16)(x) & (__u16)0x00ffU) << 8) | \
 58                 (((__u16)(x) & (__u16)0xff00U) >> 8) ))
...
 80 #define ___constant_swab16(x) __bswap_constant_16(x)

Normally the redeclaration of a constant, or in this case a macro, would
cause a warning to be issued by GCC, however I am compiling with the -Werror
option.  Either way, it seems odd that a multiple definition of this macro
exists.  I've noticed in the headers for kernel 2.6.23.1-21 on my Fedora 7
system the issue no longer exists.  Is there a remedy for this issue (i.e. a
patch) if I wish to remain using the kernel version 2.6.17.13 as specified
in the CLFS-1.0 guide?

Thank you in advance for your suggestions.

Dave
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