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Re: Q. on creating DLL's for use w/ excel (export names without @0,@ 4 etc?) (cygwin 1.3.13-2)


Matthew,

1. you can try ld's option --kill-at. The link cmdline would look like this:

gcc -Wl,--kill-at -Wl,--out-implib,libfoo.import.a -mno-cygwin -shared -o foo.dll foo.o

2. you can create .def file foo.def containing list of exported symbols without @NN suffix (one symbol per line). Then add .def file to your link commandline (be sure that it actually precedes all .o files).

See ld docs for more details about both approaches.

Pavel

Matthew.Willis@CIBC.ca wrote:

I've searched on google for some references to interfacing cygwin with win32
dll's. I've made a little progress but am kind of stuck creating DLL's
inside cygwin. The method I am using is the following:

/* foo.c */
#include
int WINAPI foobar() { return 1234; }

gcc -mno-cygwin foo.c -c
gcc -Wl,--out-implib,libfoo.import.a -mno-cygwin -shared -o foo.dll foo.o

When I look at the DLL file with MSVC's "depends.exe" I see the symbol is
"foobar@0" -- and I guess the @0 refers to how many bytes the function args
take (I get @4 with a pointer to double, etc.). The only way I can make the
symbols available to excel's visual basic interface is to cheat and hexedit
foo.dll to change "foobar@0" to "foobarX0". Then I can put a few lines in my
excel modules like

Declare Function foobarX0 Lib "e:\dlltest\foo.dll" () As Integer

Function MattVersion()
Dim i As Integer
i = foobarX0()
MattVersion = "MW 0.0.1.0.1." + Str(i)
End Function

Surely there is a better way. Can anyone suggest a better technique?

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