[Varnish] #736: Migration to Cygwin plataform

[Varnish]

#736: Migration to Cygwin plataform
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 Reporter:  jdzst            |        Type:  enhancement
   Status:  new              |    Priority:  normal     
Milestone:                   |   Component:  build      
  Version:                   |    Severity:  normal     
 Keywords:  cygwin, windows  |  
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 It will be nice to support Varnish in Cygwin plataform
 (http://www.cygwin.com)

 After weeks making some tests I was able to build successful Varnish in
 Cygwin, the problems that I have found are:

  1) Cygwin doesn't support CLOCK_MONOTONIC but HAVE_CLOCK_GETTIME is
 defined

  2) RTLD_LOCAL is not defined in dlfcn.h headers

  3) madvise function and MADV_RANDOM define does not exists, in Cygwin
 their correct names are posix_madvise and POSIX_MADV_RANDOM

  4) In Cygwin SO_RCVTIMEO_WORKS and SO_SNDTIMEO_WORKS doesn't work
 properly because in Windows setsockopt/getsockopt expects time-out in
 "int" milliseconds instead of "struct timeval" (in future, i think it
 could be fixed)

  5) Linkage problems ("Undefined reference" errors). The undefined
 reference is because fundamentally ELF (UNIX) and PE/COFF (Windows) are
 very different in terms of how linking works under the hood.  The short
 explanation is that PE/COFF requires all references to be resolved at
 link-time:
    * http://www.cygwin.com/ml/cygwin/2006-12/msg00592.html
    * http://www.cygwin.com/ml/cygwin/2005-07/msg00675.html
    * http://www.mail-archive.com/cygwin@cygwin.com/msg81837.html

   6) VCL compilation problems ("Undefined reference" errors). VCL compiled
 DLL uses simbols from EXE. It is necesary to create a fake import file
 from EXE to allow compilation.


 I have solved all problems modifing source code and automake scripts. I
 attach all modification to this ticket.

 It is also necessary to execute varnishd with cc_command parameter in
 order to compile VCL correctly:

 -p cc_command='cc -shared /tmp/varnish-2.1.2/bin/varnishd/varnishd-
 cache_vrt.o /tmp/varnish-2.1.2/bin/varnishd/varnishd-cache_backend_cfg.o
 -L/usr/local/lib -L/tmp/varnish-2.1.2/bin/varnishd/ -lvarnish -lvarnishd
 -Wl,--export-all-symbols -Wl,-x  -o %o %s'


 I have tested varnish and works OK.

 I think it will be interesting to add this information to wiki:
   * http://www.varnish-cache.org/wiki/Installation

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Ticket URL: <http://varnish-cache.org/ticket/736>
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