[Bug 3937] New: Macro and struct redefinition in <netinet/in.h> and <linux/in.h>

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3937

           Summary: Macro and struct redefinition in <netinet/in.h> and
                    <linux/in.h>
           Product: uClibc
           Version: unspecified
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
        AssignedTo: unassigned at uclibc.org
        ReportedBy: wuyun1984_1984 at 163.com
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


When <netinet/in.h> and <linux/in.h> are simultaneously included in your code,
a screen of compiling errors jumped out:

/usr/include/linux/in.h:26: error: redeclaration of enumerator ‘IPPROTO_IP’
/usr/include/netinet/in.h:33: error: previous definition of ‘IPPROTO_IP’ was
here
/usr/include/linux/in.h:27: error: redeclaration of enumerator ‘IPPROTO_ICMP’
/usr/include/netinet/in.h:37: error: previous definition of ‘IPPROTO_ICMP’ was
here
/usr/include/linux/in.h:28: error: redeclaration of enumerator ‘IPPROTO_IGMP’
/usr/include/netinet/in.h:39: error: previous definition of ‘IPPROTO_IGMP’ was
here
/usr/include/linux/in.h:29: error: redeclaration of enumerator ‘IPPROTO_IPIP’
/usr/include/netinet/in.h:41: error: previous definition of ‘IPPROTO_IPIP’ was
here
/usr/include/linux/in.h:30: error: redeclaration of enumerator ‘IPPROTO_TCP’
/usr/include/netinet/in.h:43: error: previous definition of ‘IPPROTO_TCP’ was
here
/usr/include/linux/in.h:31: error: redeclaration of enumerator ‘IPPROTO_EGP’
/usr/include/netinet/in.h:45: error: previous definition of ‘IPPROTO_EGP’ was
here
/usr/include/linux/in.h:32: error: redeclaration of enumerator ‘IPPROTO_PUP’
/usr/include/netinet/in.h:47: error: previous definition of ‘IPPROTO_PUP’ was
here
/usr/include/linux/in.h:33: error: redeclaration of enumerator ‘IPPROTO_UDP’
/usr/include/netinet/in.h:49: error: previous definition of ‘IPPROTO_UDP’ was
here
/usr/include/linux/in.h:34: error: redeclaration of enumerator ‘IPPROTO_IDP’
/usr/include/netinet/in.h:51: error: previous definition of ‘IPPROTO_IDP’ was
here
/usr/include/linux/in.h:36: error: redeclaration of enumerator ‘IPPROTO_RSVP’
/usr/include/netinet/in.h:61: error: previous definition of ‘IPPROTO_RSVP’ was
here
/usr/include/linux/in.h:37: error: redeclaration of enumerator ‘IPPROTO_GRE’
/usr/include/netinet/in.h:63: error: previous definition of ‘IPPROTO_GRE’ was
here
/usr/include/linux/in.h:39: error: redeclaration of enumerator ‘IPPROTO_IPV6’
/usr/include/netinet/in.h:55: error: previous definition of ‘IPPROTO_IPV6’ was
here
/usr/include/linux/in.h:41: error: redeclaration of enumerator ‘IPPROTO_ESP’
/usr/include/netinet/in.h:65: error: previous definition of ‘IPPROTO_ESP’ was
here
/usr/include/linux/in.h:42: error: redeclaration of enumerator ‘IPPROTO_AH’
/usr/include/netinet/in.h:67: error: previous definition of ‘IPPROTO_AH’ was
here
/usr/include/linux/in.h:43: error: redeclaration of enumerator ‘IPPROTO_PIM’
/usr/include/netinet/in.h:79: error: previous definition of ‘IPPROTO_PIM’ was
here
/usr/include/linux/in.h:45: error: redeclaration of enumerator ‘IPPROTO_COMP’
/usr/include/netinet/in.h:81: error: previous definition of ‘IPPROTO_COMP’ was
here
/usr/include/linux/in.h:46: error: redeclaration of enumerator ‘IPPROTO_SCTP’
/usr/include/netinet/in.h:83: error: previous definition of ‘IPPROTO_SCTP’ was
here
/usr/include/linux/in.h:48: error: redeclaration of enumerator ‘IPPROTO_RAW’
/usr/include/netinet/in.h:85: error: previous definition of ‘IPPROTO_RAW’ was
here
/usr/include/linux/in.h:50: error: redeclaration of enumerator ‘IPPROTO_MAX’
/usr/include/netinet/in.h:88: error: previous definition of ‘IPPROTO_MAX’ was
here
/usr/include/linux/in.h:54: error: redefinition of ‘struct in_addr’
/usr/include/linux/in.h:113: error: redefinition of ‘struct ip_mreq’
/usr/include/linux/in.h:119: error: redefinition of ‘struct ip_mreqn’
/usr/include/linux/in.h:125: error: redefinition of ‘struct ip_mreq_source’
/usr/include/linux/in.h:131: error: redefinition of ‘struct ip_msfilter’
/usr/include/linux/in.h:144: error: redefinition of ‘struct group_req’
/usr/include/linux/in.h:150: error: redefinition of ‘struct group_source_req’
/usr/include/linux/in.h:157: error: redefinition of ‘struct group_filter’
/usr/include/linux/in.h:170: error: redefinition of ‘struct in_pktinfo’
/usr/include/linux/in.h:178: error: redefinition of ‘struct sockaddr_in’
make: *** [test.o] Error 1


I think <netinet/in.h> should be originated from <linux/in.h>, but what
<linux/in.h> says is just opposite:

 * Authors:    Original taken from the GNU Project <netinet/in.h> file.
 *        Fred N. van Kempen, <waltje at uWalt.NL.Mugnet.ORG>

Is that mean I can never change the structs defined in netinet/in.h?
That is quit ridiculous.
The right logic is you can change the definition of them, but you should
re-compile the kernel and the application simultaneously.

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