On Tue, Jul 22, 2008 at 7:19 PM, Brian Dessent <[EMAIL PROTECTED]> wrote: > Nathan Thern wrote: >> I'm following the build instructions for generic x86 *nix, going under >> the assumption that cygwin fits in that category. I believe the > Cygwin can't change the fact that fundamentally these are different > operating systems, so for example linking works differently as does the > way symbols are declared at the assembler level. Assembly is pretty > much the antithesis of portability so you can't expect this to work > without some porting. I managed to get this part working.
>> That is precisely what I tried to do: create a dll from the same .o's >> that created the .exe. > > But that's not really going to work. You can't fake it like that. What > you're doing is creating another library. ... > That might get the library to link, but at runtime it does *not* mean > that prbfish.dll will call the routines in scheme.exe. Rather, > prbfish.dll will be created with a hardcoded reference to libfoo.dll and > will fail to run if libfoo.dll is not present -- this fake library is > not fake, it is a real library, and it duplicates code in scheme.exe so > it's probably useless and broken. I did not know this. > Please read that link which has examples of how to actually export > symbols from an .exe and link the dll that imports them. If you have > the luxury of linking the .exe first then you can skip all the .def file > junk because you can simply create an import library for the .exe as a > side effect of linking it (-Wl,--out-implib) and then use that when > linking prbfish.dll. The only reason you'd ever need a .def file in > this case is if you have a circular dependency where you can't link one > without the other. > Brian That sounds great. However, I can't get it to work: "gcc -o scheme.exe *.o -Wl,--out-implib,scheme.dll.a" creates a working scheme.exe, but silently doesn't create scheme.dll.a and "gcc -shared -o scheme.exe *.o -Wl,--out-implib,scheme.dll.a" creates scheme.dll.a and creates a scheme.exe that dies with "-bash: scheme.exe: Permission denied" upon invocation. I'm moving forward by just running gcc twice, but what am I missing? regards, NT -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
