Dear Sir I am having a Driver at WinCE...\Drivers\Mydriver . In this driver file (.cpp) i am refering to another T1.c file functions . To compile this file along with driver file i modified sources file and added T1.c in the list of sources = . When i build this driver file my T1.c also get compiled . But it's giving linking error . MyDriver file(.cpp) refers to some functiions defined in T1.c file ..showing unresolved external symbols. Please tell me ,how can we remove this error . Regards Manish
Linking Error
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Linking Error
by TWFuaXNo » Tue, 25 Oct 2005 10:29:09 GMT
Re: Linking Error
by Tom Gensel (eMVP) » Tue, 25 Oct 2005 12:25:01 GMT
Are you providing C linkage declarations for the functions you are trying to
call? The C++ naming convention is different from that of C. When
compiling the .CPP file, the compiler expects that the function names
referenced within have been subjected to C++ name mangling, but they have
not since they live in a C source file. To resolve this, in your .CPP file,
or in a header file included by your C++ file, provide linking declarations
of the functions that live in T1.c with 'extern "C"' qualifiers:
'extern "C" int myFunc(void)'.
You can also use extern "C" { } around multiple declarations:
extern "C"
{
void MyFunc1(void);
void MyFunc2(int x);
}
If you do this in a header file shared by both C and C++ files, you can
bracket the extern "C" with a #ifdef _cplusplus:
#ifdef _cplusplus
extern "C"
{
#endif
// List your C file declarations here
#ifdef _cplusplus
}
#endif
This will ensure that the compiler always treats the function names with "C"
language linkage and does not try to mangle them. You should have noticed
that the unresolved external messages you saw are showing names that have
been mangled beyond the standard underscore "_" prefix added by the C
compiler.
Tom Gensel (eMVP)
Re: Linking Error
by TWFuaXNo » Tue, 25 Oct 2005 12:55:03 GMT
Thanks for the reply I tried as per your suggestion it is giving error error C2732: linkage specification contradicts earlier specification for 'InitTouchPanel' please suggest Regards Manish
Re: Linking Error
by Tom Gensel (eMVP) » Tue, 25 Oct 2005 13:23:01 GMT
Make sure you are specifying the extern "C" declaration within the .cpp file and not the .c file. If you're doing it from a header file included by both files, then you need to use the #ifdef _cplusplus method I gave in my earlier post. Also, make sure you only have one declaration for the function within the .cpp file's view. This error means that the compiler is seeing two declarations (or a declaration and a definition) of a function with different linkage specification. You need to remove the erroneous one. Tom Gensel (eMVP)
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