Hello All,
I'm sure that this is covered somewhere, however I cannot find it
currently;)
Ok, I try to build a Cygwin application that requires CAPI functions
which are installed with the drivers for an ISDN card, the DLL is named
capi2032.dll, I have an import library which comes from the manufacturer
AVM but this contains symbols not included in the DLL or elsewhere.
In the .lib library are these symbols:
$ nm capi2032.lib | grep ' T '
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
00000000 T [EMAIL PROTECTED]
in the import library I created are these symbols:
$ nm libcapi2032.dll.a | grep ' T '
00000000 T _TASK_RELEASE
00000000 T _TASK_REGISTER
00000000 T _CAPI_WAIT_FOR_SIGNAL
00000000 T _CAPI_SET_SIGNAL_FOR_16BIT
00000000 T _CAPI_RELEASE
00000000 T _CAPI_REGISTER
00000000 T _CAPI_PUT_MESSAGE
00000000 T _CAPI_MANUFACTURER
00000000 T _CAPI_INSTALLED
00000000 T _CAPI_GET_VERSION
00000000 T _CAPI_GET_SERIAL_NUMBER
00000000 T _CAPI_GET_PROFILE
00000000 T _CAPI_GET_MESSAGE_FOR_16BIT
00000000 T _CAPI_GET_MESSAGE
00000000 T _CAPI_GET_MANUFACTURER
Now linking against my import library gives me this errors:
Creating library file: .libs/libSimpleCapi.dll.a
.libs/capi20.o: In function `CAPI20_ISINSTALLED':
/p/ftproot/pub/asterisk/caiviar-0.3.5/src/capi20.c:68: undefined
reference to [EMAIL PROTECTED]'
[...]
Where does the @0 in capi20.o: [EMAIL PROTECTED] came from?
I see in the source:
extern DWORD APIENTRY CAPI_INSTALLED (void);
unsigned CAPI20_ISINSTALLED (void) {
#if defined(CYGWIN) || defined(WIN32)
return (unsigned)CAPI_INSTALLED () == 0;
#elif defined(LINUX)
return capi20_isinstalled() == CapiNoError;
#endif
So why does the compiler creats a reference to [EMAIL PROTECTED] or
is it the linker who wants to resolve CAPI_INSTALLED with @0 attached.
Sure, I could edit my .def file and create an import library that
contains the symbol names as expected by the linker, however I want
to know why this happens.
Is the docu around which explains it or can somebody who knows what
happens here tell me, please?
Gerrit
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