The is no COFF magic. the first 2 bytes indicate normally a MACHINE type.
The files I produced start etiher by: 0x8664 indicating a x86 coff header or 0x014c indicating a i386 coff header. Nevertheless, 0x0000 is also listed as IMAGE_FILE_MACHINE_UNKNOWN Could it be that your coff object only contains raw data, so that it is usable on different formats? After some searching, I think that the answer to your problem is here: http://llvm.org/docs/doxygen/html/structllvm_1_1COFF_1_1BigObjHeader.html Your header looks like a BigObjHeader This means that the object is prepared to handle relocation that are not in the 4-byte range... A feature that Free Pascal indeed does not support IIRC... There is probably an option somewhere to use normal 32-bit relocation type objects in you Visual C++ configuration, unless you really need those 64-bit relocations... Pierre > -----Message d'origine----- > De : fpc-devel-boun...@lists.freepascal.org [mailto:fpc-devel- > boun...@lists.freepascal.org] De la part de Adriaan van Os > Envoyé : vendredi 7 novembre 2014 13:10 > À : FPC developers' list > Objet : Re: [fpc-devel] Masm > > > But .... if the formats are the same, what is the cause of the error > > message " Illegal COFF Magic" when trying to statically link with FPC > a > > VCC produced .obj or .lib ? > > I found the COFF docs here <http://wiki.osdev.org/COFF> and here > <http://msdn.microsoft.com/en-us/gg463119.aspx> > > the Visual C++ produced .obj has a header that starts with > > 00 00 FF FF 01 00 4C 01 .... > > The FPC .o has a header that starts with > > 4C 01 .... > > which indicates a standard COFF header (as checked by > compiler/ogcoff.pas). > > I can not make anything of the Visual C++ produced .obj with the > Microsoft provides docs. If that > isn't typically Microsoft ... How to corrupt any standard by "slightly > modifying" it .... I will > look further to dig up some meaningful info. > > Regards, > > Adriaan van Os > > _______________________________________________ > fpc-devel maillist - fpc-devel@lists.freepascal.org > http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel