Mailing lists / fpc-devel / 2007-03
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Is it possible to use .obj files generated with visual c or gcc in my fpc program?
regards,
roozbeh
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From: "Roozbeh GHolizadeh"
Is it possible to use .obj files generated with visual c or gcc in my fpc program?
Yes.
Yury Sidorov.
So,how should i use them?
i mean i have to create a unit and do header
translation,and declare variables and function as
external?
also if that obj uses procedures like malloc or other sdtlibc funcions,does that make any problems?
regards,
roozbeh
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From: "Roozbeh GHolizadeh"
So,how should i use them? i mean i have to create a unit and do header translation,and declare variables and function as external?
Yes.
also if that obj uses procedures like malloc or other sdtlibc funcions,does that make any problems?
Ideally C obj files or libraries must not contain C rtl calls. Like zlib. Otherwise it is problematic to use them.
Yury Sidorov.
Well testing it with evc4,i get this error
test2.pas(5) Error: Failed reading coff file, illegal reloctype $000F while read
ing my.o
and well if it work,does .lib files work too?
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From: "Roozbeh GHolizadeh"
Try external linker.
and well if it work,does .lib files work too?
.lib files should work.
Yury Sidorov.
Well everything is now ok,but in my .c source i've used 'toupper' function,
now when i try to declare it in my pascal file like
function toupper(ch : integer):integer;cdecl;still i get undefined symbol toupper error from
compiler.
i guess there is a problem in linker,ie you cant use external pascal functions in c sources.
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Op Sun, 11 Mar 2007, schreef Roozbeh GHolizadeh:
The problem is the name mangling. Try to declare it like:
function toupper(ch : integer):integer;cdecl;external name 'toupper';... if the external name is 'toupper'. It might also be '_toupper'. You can check this with objdump.
Daniël
>The problem is the name mangling. Try to declare it
like:
> >function toupper(ch :
integer):integer;cdecl;external name 'toupper';> >... if the external name is 'toupper'. It might also
be '_toupper'. You =
> >can check this with objdump. > >Dani=EBl
Well actually my problem is c object files use toupper function and i want to declare it in my pascal file. (i know it is very easy to being implemented in c..but now just for curusity.)
so declaring external is reverse of what i want to do. I also tried with _toupper.didnt work,although i
turned off underscoring of exporting function in c compiler.
also tobjdump says unknown file.i cant dump c compiler generated .obj files.
regards,
roozbeh
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Op Sun, 11 Mar 2007, schreef Roozbeh GHolizadeh:
Ok, that can be done too, declare it like this:
function toupper(ch : integer):integer;cdecl;public;alias:'toupper';Daniël
like: integer):integer;cdecl;external name 'toupper'; be '_toupper'. You = Well actually…
I didn't read any mails before this, but I have some experience with C obj. files (.o generated with gcc --> fpc).
I don't remember what I've been doing a half year ago (the way is not like today), but smth was with _NAME. I think it is gpc style. About "true method" you may read in
ftp://ftp.freepascal.org/pub/fpc/docs-pdf/CinFreePascal.pdf And I saw some information in fpc docs.