[Bug 1739300] Re: The header files fcntl.h and linux/fcntl.h are incompatible

[Mike Jonkmans]

Setting the status to Confirmed, though i am the reporter.
This is slightly inconsistent. Brain hurts.

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Title:
  The header files fcntl.h and linux/fcntl.h are incompatible

Status in glibc package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The program try.c, below, does not compile.
  Though with HAVE_ARCH_STRUCT_FLOCK and HAVE_ARCH_STRUCT_FLOCK64 defined, it compiles.
  But then fails again to compile, when _GNU_SOURCE is also defined.
  I expect this to compile in all three cases.

  $ cat try.c
  //#define _GNU_SOURCE
  //#define HAVE_ARCH_STRUCT_FLOCK
  //#define HAVE_ARCH_STRUCT_FLOCK64
  #include <fcntl.h>
  #include <linux/fcntl.h>
  int main(int argc, char *argv[]){}

  $ gcc try.c 
  In file included from /usr/include/x86_64-linux-gnu/asm/fcntl.h:1:0,
                   from /usr/include/linux/fcntl.h:4,
                   from try.c:5:
  /usr/include/asm-generic/fcntl.h:195:8: error: redefinition of ‘struct flock’
   struct flock {
          ^~~~~
  In file included from /usr/include/fcntl.h:35:0,
                   from try.c:4:
  /usr/include/x86_64-linux-gnu/bits/fcntl.h:35:8: note: originally defined here
   struct flock
          ^~~~~
  $ gcc -DHAVE_ARCH_STRUCT_FLOCK -DHAVE_ARCH_STRUCT_FLOCK64 try.c ## this is ok

  $ gcc -D_GNU_SOURCE -DHAVE_ARCH_STRUCT_FLOCK -DHAVE_ARCH_STRUCT_FLOCK64 try.c 
  In file included from /usr/include/x86_64-linux-gnu/asm/fcntl.h:1:0,
                   from /usr/include/linux/fcntl.h:4,
                   from try.c:5:
  /usr/include/asm-generic/fcntl.h:155:8: error: redefinition of ‘struct f_owner_ex’
   struct f_owner_ex {
          ^~~~~~~~~~
  In file included from /usr/include/x86_64-linux-gnu/bits/fcntl.h:61:0,
                   from /usr/include/fcntl.h:35,
                   from try.c:4:
  /usr/include/x86_64-linux-gnu/bits/fcntl-linux.h:267:8: note: originally defined here
   struct f_owner_ex
          ^~~~~~~~~~

  $ gcc --version | head -1
  gcc (Ubuntu 7.2.0-8ubuntu3) 7.2.0

  $ lsb_release -rd
  Description:	Ubuntu 17.10
  Release:	17.10

  $ dpkg -S /usr/include/x86_64-linux-gnu/bits/fcntl.h
  libc6-dev:amd64: /usr/include/x86_64-linux-gnu/bits/fcntl.h
  # Package: libc6-dev
  # Version: 2.26-0ubuntu2

  $ dpkg -S /usr/include/x86_64-linux-gnu/asm/fcntl.h
  linux-libc-dev:amd64: /usr/include/x86_64-linux-gnu/asm/fcntl.h
  # Package: linux-libc-dev
  # Version: 4.13.0-19.22

  Regards, Mike

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