More fun with DLL's
Paul Herzog
esstech@ess400.com
Wed Aug 26 13:44:00 GMT 1998
I think I've got the best of both worlds now, at the cost of 3 .def files for each DLL. If I were more motivated, I might look to generate one def file from the other, or generate all the def files from the .o files directly ( I thought someone was doing this already...)
In my source, i have:
// mylib.c
int WINAPI myFunc(int arg1, int arg2)
{
return arg1 + arg2;
}
After compilation, my .o file has the symbol _myFunc@8 as expected.
To build my DLL export table, I use the following .def file:
// mylib-exp.lib
LIBRARY MYLIB
EXPORTS
myFunc=myFunc@8
and the command lines ==>
gcc -mdll -o junk.tmp -Wl,--base-file,base.tmp mylib.o
dlltool --dllname mylib.dll --def mylib-a.def -k --output-exp libmylib.exp --base-file base.tmp
This leaves me with a DLL that exports and associates the symbol
myFunc with the code at entry point _myFunc@8 from my .o file
Now, if I want to make an MS Link.exe library, i use the following DEF File:
// mylib-ms.def
LIBRARY MYLIB
EXPORTS
myFunc
and the command line ==>
lib /DEF:mylib-ms.def
Finally, to make a libmylib.a file, i use the following DEF File:
// mylib-a.def
LIBRARY MYLIB
EXPORTS
myFunc@8=myFunc
and the command line ==>
dlltool --dllname mylib.dll --def mylib-a.def -k --output-lib libmylib.a
So, I have a DLL that is GetProcAddress() friendly (it doesn't include the @nn decorations in the exported symbols),
and I have a library for people who insist on using msvc, and I have a lib*.a file to use the DLL from other gcc compiled/linked projects.
Pretty gross huh?
--
Paul Herzog
-
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