devenv /debugexe "%IQDIR15%\bin32\iqsrv15.exe" [commandline options for your server]
Each platform will have a debugger and each will have their own command line syntax. Sybase IQ source code is not required. The msvs debugger will recognize
when the user-defined functions source is executed and break at the set
breakpoints. When control returns from the user-defined functions to the server, you will only see machine code.