O/H Alexander Neundorf ??????:
On Monday 30 June 2008, Georgios Petasis wrote:
Hi all,

I am running cmake 2.6 under windows:

MESSAGE ( STATUS "Searching for Perl..." )
FIND_PACKAGE ( Perl )
FIND_PACKAGE ( PerlLibs )
IF ( PERL_FOUND )
  MESSAGE ( STATUS "  PERL_EXECUTABLE:        " ${PERL_EXECUTABLE} )
  MESSAGE ( STATUS "  PERL_INCLUDE_PATH:      " ${PERL_INCLUDE_PATH} )
  MESSAGE ( STATUS "  PERL_LIBRARY:           " ${PERL_LIBRARY} )
ENDIF ( PERL_FOUND )

The output is:

-- Searching for Perl...
-- Found Perl: C:/Program Files (x86)/Perl/bin/perl.exe
-- Could NOT find PerlLibs
--   PERL_EXECUTABLE:        C:/Program Files (x86)/Perl/bin/perl.exe
--   PERL_INCLUDE_PATH:      PERL_INCLUDE_PATH-NOTFOUND
--   PERL_LIBRARY:           PERL_LIBRARY-NOTFOUND

It seems that it can locate perl (which is also in the PATH), but not
its libs. Can I fix this?

Please have a look at FindPerlLibs.cmake and add some MESSAGE(STATUS ...) to find out what is going on exactly. Is it simply the version number which is missing ?

Alex
Dear Alex,

I have solved this problem by not making adjustments to cmake files, as I have to support computers with a default cmake installation. Instead, I have put the following code in my CMakeLists.txt:

 EXECUTE_PROCESS ( COMMAND ${PERL_EXECUTABLE}
                   -MConfig -e "print \$Config{version}"
                   OUTPUT_VARIABLE PERL_OUTPUT
                   RESULT_VARIABLE PERL_RETURN_VALUE )
 IF ( NOT PERL_RETURN_VALUE )
   SET ( PERL_VERSION ${PERL_OUTPUT} )
 ENDIF ( NOT PERL_RETURN_VALUE )

 ## Try to fix failure in PERL_INCLUDE_PATH
 IF ( PERL_INCLUDE_PATH MATCHES .*-NOTFOUND )
   EXECUTE_PROCESS ( COMMAND ${PERL_EXECUTABLE}
                     -MConfig -e "print \$Config{archlibexp}"
                     OUTPUT_VARIABLE PERL_OUTPUT
                     RESULT_VARIABLE PERL_RETURN_VALUE )
   IF ( NOT PERL_RETURN_VALUE )
     FIND_PATH ( PERL_INCLUDE_PATH perl.h ${PERL_OUTPUT}/CORE )
   ENDIF ( NOT PERL_RETURN_VALUE )
 ENDIF ( PERL_INCLUDE_PATH MATCHES .*-NOTFOUND )
 ## Try to fix failure in PERL_LIBRARY
 IF ( PERL_LIBRARY MATCHES .*-NOTFOUND )
   EXECUTE_PROCESS ( COMMAND ${PERL_EXECUTABLE}
                     -MConfig -e "print \$Config{libperl}"
                     OUTPUT_VARIABLE PERL_OUTPUT
                     RESULT_VARIABLE PERL_RETURN_VALUE )
   IF ( NOT PERL_RETURN_VALUE )
     FIND_LIBRARY ( PERL_LIBRARY NAMES ${PERL_OUTPUT}
                                 PATHS ${PERL_INCLUDE_PATH} )
   ENDIF ( NOT PERL_RETURN_VALUE )
 ENDIF ( PERL_LIBRARY MATCHES .*-NOTFOUND )
 MESSAGE ( STATUS "  PERL_VERSION:           " ${PERL_VERSION} )
 MESSAGE ( STATUS "  PERL_EXECUTABLE:        " ${PERL_EXECUTABLE} )
 MESSAGE ( STATUS "  PERL_INCLUDE_PATH:      " ${PERL_INCLUDE_PATH} )
 MESSAGE ( STATUS "  PERL_LIBRARY:           " ${PERL_LIBRARY} )

But, now my problem is different: I do have perl found, but I cannot convince cmake to build my code right. It seems that an improper linker switch is added automatically by cmake, but I am unable to find somewhere the exact link statement that is executed by cmake. All options are written in a temp file, which is written/deleted instantly.
Any idea on how I can see its contents?

Currently the only way to build my code is with my hand-written makefile :-(
I have been trying to resolve this problem with cmake for more than 5 days.
I still have no clue what cmake adds, but makes global symbols in my dll & the perl library different symbols,
so perl cannot update its global structures...

Best regards,

George
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