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Hi all Also be sure to include the correct run time support library in the linker command file. Without it, there is nothing to link to. Also, since you are using register passing, be sure the correct library is specified, or rebuild it as needed. FYI, those *.SRC files have all the source files so you can extract and rebuild. I cant recall which tool it is, but one of them does this for you. Read the compiler book... Incidentally, what Bill is refering to is that this compiler does not complain about the absence of function prototypes. IE you did not have #include <math.h> at the top of the file. When you forget to include the header, no prototype is found and the compiler assumes that all inputs and outputs to the function are integers (32 bit in the C3x/C4x case). Even if the link is succesfull, the results can be quite strange since what is passed on the stack is assumed to be in the wrong format! BTW: For the really adventurous types that want to learn how a math library works, the source files are included in the *.SRC files. You can either use the archiver to extract them, or chop them out manualy since *.SRC files are really big text files of appended information. Sometimes this can have a little bit of payback. For example, if you wanted to inline a function or trade off some resolution for speed. Best regards, Keith Larson --------------- At 09:33 AM 5/15/03 -0400, you wrote: > >Did you include math.h? Otherwise, send a copy of your .cmd file. > >Bill -----Original Message----- From: tolga yuksel [mailto:] Sent: Thursday, May 15, 2003 2:42 AM To: Subject: [c3x] I need help about C compiler H i , I'm a new user of C3x and I need help about C3x C compiler.I use a TMS320C31 DSK with a IBM PC and I have problem with the linker.It gives the error message 'Undefined symbol ....(for example _sin) first referenced in ...' and it doesn't give the .out file.I found the error message in spru035d.pdf.It advised -r command or referencing the symbol.I used the -r command.It gave the .out file but wrong .out file.(I tried the .out file in dsktools) Do u have any solution or suggestion?Thanks from now. +-----------+ |Keith Larson | |Member Group Technical Staff | |Texas Instruments Incorporated | | | | 281-274-3288 | | | | www.micro.ti.com/~klarson | |-----------+ | TMS320C3x/C4x/VC33 Applications | | | | TMS320VC33 | | The lowest cost and lowest power 500 w/Mflop | | floating point DSP on the planet! | +-----------+ |