Niklaus wrote: > Hi, > > I've an online judge system where i take the source code submitted > by an user and compile it to an executable and then run it against a > predetermined input to produce an output which is checked against a > predetermined output. This determines the results as Correct, Wrong or > Compile error. > > The languages are C,C++,java. > > Please suggest solutions for the below problems > > 1) How to tell gcc to stop after the first error. I use both gcc > 4.2 and gcc 3.4. I tried -Wfatal-error and -Wfatal-error it says > unrecognized option. Trim the output to the first 50 lines. If the output is 50 lines long, kill the compiler process. > 2) There are many people who submit code without compiling. If they > submit C++ (STL or templates ) code which fails to compile due to some > problem, it produces lots of output and it is slow, some take 3 - 5 > secs. So that is for each submission. In this way if you make 100 > submissions the whole system is slow. How to over come this problem? I > tried -fsyntax-only but the difference is not that noticable because > after that -fsynax-only i have to recompile. > > 3) Can this submissions be collected for every 5 secs and then > compiled in parallel to produce parallel output. Invoking gcc for each > submission is going to be slow ? > > 4) Can we do anything about gcj ? Java compilation errors take the > most time. Recent gcj fires off an external process to run the Java front-end. It depends on how your system is configured, but it's possible you're running an interpreted Java front-end. Andrew.
