[Bug 50255] New: server/fd.c:1986:18: error: 'O_SYMLINK' undeclared

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50255

            Bug ID: 50255
           Summary: server/fd.c:1986:18: error: 'O_SYMLINK' undeclared
           Product: Wine-staging
           Version: 6.0-rc1
          Hardware: x86-64
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: gerald at pfeifer.com
                CC: leslie_alistair at hotmail.com, marcus at jet.franken.de,
                    z.figura12 at gmail.com

Created attachment 68780
  --> https://bugs.winehq.org/attachment.cgi?id=68780
Proposed patch to unbreak the build

6.0-rc1 features a new build failure versus 5.22:

server/fd.c: In function 'open_fd':
server/fd.c:1986:18: error: 'O_SYMLINK' undeclared (first use in this
function)
 1986 |         flags |= O_SYMLINK;
      |                  ^~~~~~~~~

Indeed O_SYMLINK appears nowhere under /usr/include on FreeBSD 11.x
nor on my openSUSE system with glibc 2.32. 

The latter does have O_PATH, so the following snippet from server/fd.c
comes to the rescue:

  #if !defined(O_SYMLINK) && defined(O_PATH)
  # define O_SYMLINK (O_NOFOLLOW | O_PATH)
  #endif

The attached patch fixes (or works around) this issue.  Successfully
tested on FreeBSD 11/i386.

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