[GRASS-dev] Re: [GRASS GIS] #1125: wingrass7 - ctypes - compiling error

[GRASS GIS]

#1125: wingrass7 - ctypes - compiling error
------------------------------+---------------------------------------------
 Reporter:  hellik            |       Owner:  grass-dev@…              
     Type:  defect            |      Status:  new                      
 Priority:  blocker           |   Milestone:  6.5.0                    
Component:  Compiling         |     Version:  svn-trunk                
 Keywords:  wingrass, ctypes  |    Platform:  MSWindows Vista          
      Cpu:  x86-32            |  
------------------------------+---------------------------------------------

Comment(by glynn):

 Replying to [comment:13 martinl]:

 > > BTW, is there a way how to disable LFS? - {{{--disable-largefile}}}
 doesn't seems to work.
 >
 > using {{{--disable-largefile}}} I am getting on *MS Windows*
 >
 {{{
 checking for _LARGEFILE_SOURCE value needed for large files... no
 checking for fseeko... no
 checking if system supports Large Files at all... yes
 }}}
 >
 > and
 >
 {{{
 USE_LARGEFILES      = 1
 }}}

 > Not sure why it's not working on MS Windows.

 The "meta" answer is: because the code was lifted wholesale from cdrtools
 without any attempt at understanding it.

 The Windows check for "if system supports Large Files at all" tests that
 off64_t can represent 2^63-1, and that fseeko64 and ftello64 exist. This
 check will always pass.

 The Linux check tests that off_t can represent 2^63-1 and that fseeko and
 ftello exist. These checks will only pass if the relevant feature macros
 have been defined.

 Essentially, Linux has macros to enable the LFS features and to make LFS
 the default. Windows has neither; the LFS features are always available
 but must be used explicitly.

 The USE_LARGEFILES setting is based upon whether the LFS check passes, not
 whether you requested LFS. On Linux, they're effectively the same thing,
 as the LFS check will only pass if you ask for it; on Windows, it always
 passes.

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/1125#comment:14>
GRASS GIS <http://grass.osgeo.org>