[ET Trac] [Einstein Toolkit] #1506: compiling Cactus on Windows

[Einstein Toolkit]

#1506: compiling Cactus on Windows
--------------------------------+-------------------------------------------
 Reporter:  jtao                |       Owner:                     
     Type:  defect              |      Status:  new                
 Priority:  minor               |   Milestone:                     
Component:  Cactus              |     Version:  development version
 Keywords:  compiling, windows  |  
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 Hi,

 In the process to create the cactusBSSN benchmark for SPEC, I worked with
 Mat from PGI(now NVIDIA) to help resolve some compilation issues on
 Windows. I don't have patches for each one of them, but attemptive
 solutions could be found in the email below.

 These are not critical issues but it would be good to be resolved to help
 future windows users if there is any.

 Regards,
 Jian


 Mathew COLGROVE wrote:
 > Hi Jian,
 >
 > I've been working on porting cactusBSSN to Windows.  After working
 through some header file configuration, I encountered several undefined
 references.  I've been able to work around some of them, but a few others
 I need some help with.
 >
 > 1) "STDOUT_FILENO" and "STDERR_FILENO" in Cactus/main/Warnlevel.c
 > These symbols are found in "unistd.h" which is not available on Windows.
 I just commented these lines out since I don't think this section is
 executed. Though, the proper fix would be to define then in
 > the cctk_Config.h file if not "HAVE_UNISTD_H" is not.

 The function isatty is defined in unistd.h. A conditional macro will be
 necessary for that function as well in this case.

 #if HAVE_UNISTD_H

   if (!isatty (STDOUT_FILENO))
     val = "";

 #endif


 > 2) "hypot" and "copysign" in Cactus/main/Complex.c
 >
 > Windows does support "hypot" and "copysign", however they spell them
 "_hypot" and "_copysign".  To work around, I created two versions of each
 macro that use these symbols.

 I will probably do the same.

 > 3) "regexec", "regfree", and "regcomp" in Cactus/main/Parameters.c and
 Cactus/utils/misc.c
 >
 > Windows does not support these functions.  We may be able to integrate a
 port from glibc into the benchmark but I would rather not.  Since previous
 versions of Cactus did not used these symbols, can we use an older version
 other these files?

 As a matter of fact, Cactus includes files from the src of the GNU
 C library. You can find them under Your_Cactus/src/gnu.

 It is likely that you pre-configured Cactus on a linux box or other
 systems which provide the library. Cactus will then use the
 system default instead.

 To compiler regex.c getopt.c distributed with Cactus, you need to go to

 Your_Cactus/configs/spec/config-data/

 and set both BUILD_GETOPT BUILD_REGEX to yes.

 # GNU stuff
 BUILD_GETOPT = yes
 BUILD_REGEX  = yes

 This will solve #4 below as well.
 > 4) "getopt_long_only", "optarg", and "optind"  in
 Cactus/main/ProcessCommandLine.c
 >
 > Again, there is no Windows equivalent for these symbols.  We may be able
 to integrate something from
 http://gnuwin32.sourceforge.net/packages/libgw32c.htm, but I would rather
 not.  Since previous versions of Cactus did not used these symbols, can we
 use an older version other this file?
 >
 > 5) "gethostname" and "gethostbyname" in Cactus/utils/Network.c
 >
 > Windows does have these functions but we'd need to link with a DLL which
 I'd rather not have to do (the user should have the option on how to
 link).  Though, I think we'd be safe to remove these functions.

 Yes, the prototypes of gethostname and gethostbyname can be found in
 winsock2.h, and Cactus knows how to deal with them on Windows.

 ---------------------------------------
 Network.c :
 ...
 #elif defined HAVE_WINSOCK2_H
 #include <winsock2.h>
 #endif /* HAVE_WINSOCK2_H */
 ...
 ---------------------------------------

 If linking DLL will be an issue, I would suggest you keep Util_GetHostName
 but make it a dummy function since Util_GetHostName
 serves as the interface to gethostname for Cactus.

 Regards,
 Jian

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1506>
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