Hello, About the struct alignment issue, I found some docs here: http://refspecs.freestandards.org/ and fixed the bug following the instructions in "System V Application Binary Interface Intel386 Architecture Processor Supplment, Fourth Edition". According to the other ABI docs under "Processor Specific ELF documents" the same rules apply at least for x86-64, MIPS and PowerPC. These documents mention System V, so I suppose it could be different for other systems. I have tested this under Win32 and MacOS X (as well as Linux) and they seem to use the same rules. So anyway, these are the new changes in cffi-luis: Fri Sep 2 08:57:50 WEST 2005 Luis Oliveira <loliveira@common-lisp.net> * CFFI User Manual update. Fri Sep 2 05:40:50 WEST 2005 Luis Oliveira <loliveira@common-lisp.net> * Fix struct bug, defcvar bug and tweaked bindings.lisp - defcvar now works (more) correctly with aggregate types. - struct types now carry alignment information which is now correctly calculated (for unions too) according to the x86 ABI (tested on darwin/ppc too, but should study other ABI docs at some point). - also tail padding is now correctly added to structs, when necessary. (also according to the x86 ABI). - 4 new tests for this struct bug (reported by Wilco Greven). - tweaked tests/bindings.lisp to correctly load the library on Lispworks and to make it more portable across win/nix/etc.. Thu Sep 1 08:36:04 WEST 2005 Luis Oliveira <loliveira@common-lisp.net> * Slight change to defcenum to make Corman Lisp happier. Wed Aug 31 07:46:45 WEST 2005 Luis Oliveira <loliveira@common-lisp.net> * Well, lets support MINGW too. Tweaked the Makefile a bit to support MINGW too. Wed Aug 31 07:30:13 WEST 2005 Luis Oliveira <loliveira@common-lisp.net> * Win32 tweaks to the test library... ... in order to work with the MSVC++ free toolkit. - correctly load the test library. - and __declspec(dllexport) to the test library functions - implement a strdup, used in 2 tests - added a compile.bat, the free toolkit doesn't seem to have nmake. Also, I don't know how to make ASDF automatically compile the lib under win32 like I did for *nix. -- Luís Oliveira http://student.dei.uc.pt/~lmoliv/ Equipa Portuguesa do Translation Project http://www2.iro.umontreal.ca/~pinard/po/registry.cgi?team=pt