problems with linux/tcp.h and g++

problems with linux/tcp.h and g++

[Giacomo]

Hi to all!

I developed a kernel module which needs linux/tcp.h and a userspace
program that
communicates with it via netlink.

Kernel code uses linux/tcp.h

userspace C code correctly uses linux/tcp.h

A gui written in C++, using linux/tcp.h produces a compilation error:

In file included from ../common/defs/ipfi_structures.h:9,
                 from ../ipfi/src/includes/ipfire_structs.h:20,
                 from iqlistener.h:4,
                 from iqlistener.cpp:1:
/usr/include/linux/tcp.h:72: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:72: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:73: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:73: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:74: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:74: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:75: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:75: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:76: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:76: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:77: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:77: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:78: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:78: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:79: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:79: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:80: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:80: error: a function call cannot appear in a
constant-expression
/usr/include/linux/tcp.h:81: error: '__u32 __fswab32(__u32)' cannot
appear in a constant-expression
/usr/include/linux/tcp.h:81: error: a function call cannot appear in a
constant-expression

The same code used to compile until a recent update.

Now I am including netinet/tcp.h instead of linux/tcp.h to compile in userspace.

Is there any known issue with linux/tcp.h?

Which is the differece between linux/ and netinet/includes and which
is more correct to use?

Thanks for any hint.

Kernel 2.6.30
gcc version 4.3.3
glibc 2.10.1
sys-kernel/linux-headers 2.6.30

-- 
Giacomo S.
http://www.giacomos.it

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