[CMake] Why I cannot build a dll that embeds perl with cmake?

[Georgios Petasis]

O/H Georgios Petasis έγραψε:
> Hi all,
>
> I have some C code that embeds perl into a C application.
>
> If I compile my code with:
>
> cl.exe <result of "perl -MExtUtils::Embed -e ccopts">
>
> and then:
>
> link <result of "perl -MExtUtils::Embed -e ldopts">
>
> the resulting dll works. But if I compile it with cmake, my code 
> always crashes, because a perl structure (a global pointer) is left 
> uninitialised, and is always NULL. It seems that cmake inserts 
> something that changes the building process.
> How can I find what commands are executed when the code is 
> compiled/linked?
> I even tried the following:
>
> EXECUTE_PROCESS ( COMMAND ${PERL_EXECUTABLE}
> -MExtUtils::Embed -e ccopts
> OUTPUT_VARIABLE PERL_OUTPUT
> RESULT_VARIABLE PERL_RETURN_VALUE )
> IF ( NOT PERL_RETURN_VALUE )
> STRING ( REPLACE "-O1" "" ADDITIONAL_PERL_CCOPTS ${PERL_OUTPUT} )
> ENDIF ( NOT PERL_RETURN_VALUE )
> EXECUTE_PROCESS ( COMMAND ${PERL_EXECUTABLE}
> -MExtUtils::Embed -e ldopts
> OUTPUT_VARIABLE PERL_OUTPUT
> RESULT_VARIABLE PERL_RETURN_VALUE )
> IF ( NOT PERL_RETURN_VALUE )
> SET ( ADDITIONAL_PERL_LDOPTS ${PERL_OUTPUT} )
> ENDIF ( NOT PERL_RETURN_VALUE )
> SET ( CMAKE_C_FLAGS "-DUSE_TCL_STUBS ${ADDITIONAL_PERL_CCOPTS}" )
> SET ( CMAKE_C_FLAGS_RELEASE "" )
> SET ( CMAKE_C_FLAGS_DEBUG "" )
> SET ( CMAKE_SHARED_LINKER_FLAGS ${ADDITIONAL_PERL_LDOPTS} )
> SET ( CMAKE_SHARED_LINKER_FLAGS_RELEASE "" )
> SET ( CMAKE_SHARED_LINKER_FLAGS_DEBUG "" )
>
> But it didn't change anything. The produced dll still crashes. Any ideas?
>
> Regards,
>
> George
Actually, looking at the two dlls (one produced with a nmake makefile I 
have written, and the one built with cmake), they import different 
functions:

nmake cmake
300 Perl_get_context 300 Perl_get_context
265 Perl_Tstack_sp_ptr 265 Perl_Tstack_sp_ptr
214 Perl_Tmarkstack_ptr_ptr 214 Perl_Tmarkstack_ptr_ptr
263 Perl_Tstack_base_ptr 263 Perl_Tstack_base_ptr
2C5 Perl_croak 2C5 Perl_croak
2C6 Perl_croak_nocontext 2C6 Perl_croak_nocontext
196 Perl_Isv_undef_ptr 196 Perl_Isv_undef_ptr
3D6 Perl_newSVpv 3D6 Perl_newSVpv
467 Perl_sv_2mortal 467 Perl_sv_2mortal
518 Perl_win32_init 518 Perl_win32_init
51F perl_alloc 51F perl_alloc
525 perl_construct 525 perl_construct
529 perl_parse 529 perl_parse
52A perl_run 52A perl_run
526 perl_destruct 526 perl_destruct
527 perl_free 527 perl_free
454 Perl_set_context 454 Perl_set_context
2F3 Perl_eval_pv 2F3 Perl_eval_pv
462 Perl_sv_2bool 462 Perl_sv_2bool
46A Perl_sv_2pv_flags 46A Perl_sv_2pv_flags
51C boot_DynaLoader 51C boot_DynaLoader
3E1 Perl_newXS 3E1 Perl_newXS
3E2 Perl_newXS_flags
197 Perl_Isv_yes_ptr

How is possible to use the same definitions & link flags and get 
different results?

George